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Prof. Boerner's Explorations

Thoughts and Essays that explore the world of Technology, Computers, Photography, History and Family.

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Archive for January 3rd, 2010
Gerald Boerner

    

JerryPhoto_8x8_P1010031 In examining how photography works, we will start out by looking at how light creates an image. This posting continues our examination of some of the concepts and elements that combine to produce memorable photographs. We hope you will join our exploration of this exciting phenomenon and that it will help you become a more skilled photographer. We also hope that it will encourage you to take more photos, especially of your growing family. It is great to look back over these photos as you enter your golden years and reflect back on your growing family.  GLB

    

“No photographer is as good as the simplest camera.”
— Edward Steichen

“A photograph is memory in the raw.”
— Carrie Latet

“I hate cameras.  They are so much more sure than I am about everything.”
— John Steinbeck

“There are no rules for good photographs, there are only good photographs.”
— Ansel Adams

“I think a photography class should be a requirement in all educational programs because it makes you see the world rather than just look at it.”
— Author Unknown

“Every time someone tells me how sharp my photos are, I assume that it isn’t a very interesting photograph.  If it were, they would have more to say.”
— Author Unknown

“Perishability in a photograph is important in a picture.  If a photograph looks perishable we say, ‘Gee, I’m glad I have that moment.’ ”
— John Loengard, "Pictures Under Discussion"

“There will be times when you will be in the field without a camera.  And, you will see the most glorious sunset or the most beautiful scene that you have ever witnessed.  Don’t be bitter because you can’t record it.  Sit down, drink it in, and enjoy it for what it is!”
— DeGriff

    

Drawing with Light: Controlling the Process?

As we continue our exploration of “Drawing with Light”, we will look at some general issues related to capturing an image and determining the most appropriate exposure. You need to remember that many things must come together to create a photograph. We need light, of course, but that light must be passed through a lens to focus the image, the aperture and shutter speed to control the exposure, and the sensitivity of the sensing media (film or digital sensor). We will start that exploration in this posting and continue exploring these factors in the coming weeks.

The Photographic System

The Photo Head web site documents three basic elements of the photographic system. Essentially, we need to control the light passing through the lens and camera system and landing on the photographic sensor, either film or a digital sensor. Let’s look at the basics of combining these elements to create an image.

Light… In order for an image to be captured on film, it must be exposed to light. In photography, it is important to be able to measure light. Too much light can ruin a photograph, and so can too little. Light can be measured and controlled by the brightness and by the duration of the light passing onto the Capture Medium.

Camera… Cameras come in all shapes and sizes. Three things all cameras have in common are a lens, an aperture, and a shutter. By adjusting the aperture ( F-Stop ) and shutter settings (Shutter Speed), you change the amount of light that falls on the film or digital sensor.

  •   The Lens: fig1.3.6
    The lens contains elements that work together to focus the light on the sensing medium. The quality of the glass and workmanship of preparing these lens elements determines how well these elements work together. In addition, the better lenses use special coatings on the lens elements to prevent light reflection and scattering.
     
  • The Aperture:
    aperture-animThe amount of light that passes through the lens to the sensing media (film or sensor) is determined by a set of overlapping leafs that change the size of the opening through which the light will pass. The larger the opening, the smaller the f-stop, and less time that will be required to create your image.
     
  • The Shutter:
    shutteranimation2The length of time that the light is permitted to fall on the sensing media (film or sensor) is controlled by a shutter mechanism that controls the duration of the exposure. The longer the shutter allows the light to pass through to the recording media, the more the media will be exposed.

Capture Medium… Once the light has passed through the lens, the aperture, and the shutter, it will activate the sensing media. This may be film (coated glass or plastic carrier) or a digital sensor. In either case, the degree to which the image is recorded depends on the amount of light hitting the medium.

  • Film:
    negfilmsFilm reacts to light. The more light you give to it, the brighter the image will be. You can buy all types of film for your camera, and they will all have a FILM SPEED. "Fast" films are more sensitive to light than "slow" films. Only the film is exposed in the camera, the image is activated and fixed on the film in the traditional darkroom.
     
  • Digital Sensor: fig170
    The digital sensor reacts to light and records the amount of light in digital signals. The more light you give to it, the brighter the image will be. Different cameras have sensors that are different sizes and sensitivities. Unlike film, the digital image must be processed in the camera and stored on some long lasting medium, such as Compact Flash, Secure Media, or other types of digital storage. These data are then processed by a computer into a finished image.

Output Print… Once the image has been stored on the media and processed in the darkroom (regular or digital), it is ready to create a photographic print. This printing process may be done either in the wet, traditional darkroom or on a digital printer.

Determining the Exposure

The amount of light that will give you a proper photo is jointly determined by the aperture (amount of light admitted), the shutter speed (length of time the light is admitted), and the ISO (sensitivity of the sensing media). Varying any one of these factors will also affect the settings on the other two. The goal is to produce a combination of settings that gives you the image that you envision from the scene while also providing a “good” exposure. exposure-triangle The following are some examples of different types of shots and the settings associated with those photos. These included here, but can be found on the Digital Photography School (see below for the reference). Take a look at these examples:

3718568107_06c6f4210b_oScanario 1 – Sports

  • High speed is needed to freeze action
  • Use Shutter Priority
  • Set shutter speed to 1/800sec
  • The light meter sets the aperture to f10
  • If under exposed, change ISO to compensate – ISO: 400

    

3718725601_98166939c2_oScanario 2 – Portrait

  • An artistic narrow depth of field is desired
  • Use Aperture Priority
  • Set aperture to f5.6
  • The light meter sets the shutter to 1/160sec
  • If under exposed, change ISO to compensate – ISO: 100

     

3154416393_01bdaa69c5_oScenario 3 – Night scenery

  • Ambient light is too low to accurately meter
  • Use full Manual
  • Set aperture to suit scene, erring to wider – f11
  • Set a long shutter speed to light meter’s best guess – 20sec
  • Set ISO to lowest possible for correct exposure – ISO: 100
  • Take a test shot and adjust settings if the light meter got it wrong

     

Digital Photography School Web Site: The Light Meter…
http://digital-photography-school.com/photography-1018-meter

Photo Head Web Site: Crash Course in Photography…
http://www.photonhead.com/exposure/crash_course.php

by Gerald Boerner

  

JerryPhoto_8x8_P1010031We continue our four part series on the “Twelve Days of Christmas” that is probably best known for the song of the same name. We start by looking at the song itself, especially at the use of the song to help teach parishioners the catechism. While this is somewhat controversial, it leads us into the examination of how each verse can, in fact, teach about the catechism. Please enjoy this series.   GLB

    

“Christmas, children, is not a date. It is a state of mind.”
— Mary Ellen Chase

“Perhaps the best Yuletide decoration is being wreathed in smiles.”
— Anonymous

“If there is no joyous way to give a festive gift, give love away. ”
— Anonymous

“There is no ideal Christmas; only the one Christmas you decide to make as a reflection of your values, desires, affections, traditions.”
— Bill McKibben

“Christmas waves a magic wand over this world, and behold, everything is softer and more beautiful.”
— Norman Vincent Peale

“Blessed is the season which engages the whole world in a conspiracy of love.”
— Hamilton Wright Mabi

“From Home to home, and heart to heart, from one place to another. The warmth and joy of Christmas, brings us closer to each other.”
— Emily Matthews

“Let us remember that the Christmas heart is a giving heart, a wide open heart that thinks of others first. The birth of the baby Jesus stands as the most significant event in all history, because it has meant the pouring into a sick world of the healing medicine of love which has transformed all manner of hearts for almost two thousand years… Underneath all the bulging bundles is this beating Christmas heart.”
— George Mathhew Adams

  

The Twelve Days of Christmas

Seven Swans Aswimming Probably the most apparent experience that most of us have had with the 12 Days of Christmas is the song. I have included information from a couple of web pages here for your convenience. For fuller reference, please refer to the actual web pages, since only some of their content is cited here.

The most interesting, but controversial, thing about these articles is the probable reason for the song in the first place: for children learning the catechism of their church. So, let’s begin our examination.

Looking at the Song (How Stuff Works?)

The carol has its roots in 18th-century England, as a memory-and-forfeit game sung by British children. In the game, players had to remember all of the previous verses and add a new verse at the end. Those unable to remember a verse paid a forfeit, in the form of a kiss or a piece of candy to the others.

One theory, however, connects the carol to the era when Catholicism was outlawed in England, from 1558 and 1829. The carol, it is said, was a catechism song for Catholics to learn "the tenets of their faith," as they could not openly practice in Anglican society [source: Snopes.com]. While many still hold the idea of a coded hymn to be true, there’s no substantive evidence that this was the case, nor is there any evidence that the verses contain anything uniquely Catholic.

Here are the verses of the song, along with their supposed symbolism[Source: BBC.com]:

  • A Partridge in a Pear Tree – Jesus Christ
  • Two Turtle Doves - The Old and New Testaments
  • Three French Hens – The three virtues of Faith, Hope and Charity
  • Four Calling/Collie Birds – Four gospels, Matthew, Mark, Luke and John
  • Five Golden Rings – First five books of the Old Testament
  • Six Geese-a-Laying – Six days of creation before God’s rest on the seventh day
  • Seven Swans-a-Swimming – Seven gifts of the Holy Spirit
  • Eight Maids-a-Milking - Eight Beatitudes
  • Nine Ladies Dancing – Nine fruits of the Holy Spirit
  • Ten Lords-a-Leaping - Ten Commandments
  • Eleven Pipers Piping – Eleven faithful disciples
  • Twelve Drummers Drumming -Twelve points of belief in the Apostles’ Creed

While these verses are what most of us associate with the "Twelve Days of Christmas," the phrase refers to an actual 12-day period. The 12 days of Christmas, in fa­ct, are the days from Dec. 25, celebrated as the birth of Jesus Christ, to the Epiphany, celebrated on Jan. 6 as the day when the manifestation of Christ’s glory was realized.

While sects of Christianity celebrate the 12 days of Christmas differently, certain ones, such as the Eastern Orthodox Church, consider the Epiphany to be the most important day of the Christmas season. Some exchange gifts on each of the 12 days instead of only on Christmas day.

What are some other unique customs certain sects of Christianity have in celebrating the Twelve Days of Christmas? How did these days come into existence?

epiphany While there’s a consensus on what Christmas commemorates, what the Epiphany honors varies between churches and cultures. Some churches believe it’s the day of Christ’s baptism, while others celebrate it as the day the three magi visited Jesus with gifts.

But there are also differences on when the twelve days are celebrated. Western churches, for example, celebrate Christmas on the Dec. 25, the Epiphany on the Jan. 6, and the period in between as the 12 days and nights of Christmas. Other cultures, however, have different customs.

The Twelfth Night, often celebrated on the night of Jan. 5, is considered the end of the Christmas season, before the Epiphany the following day. ­The Twelfth Night was a time for feasting in England (partly inspired by Shakespeare’s play of the same name) in centuries past. Some cultures, like the French and Spanish, celebrate the Feast of the Epiphany with a king’s cake, a coffee cake with purple, green and yellow icing to commemorate the visit by the magi to the Christ child. In western cultures, the King’s Cake is associated with Mardi Gras, and the season of Carnival [source: Burnett]. Churches also vary in their celebration of the Epiphany; some Protestant churches celebrate it for an entire season, lasting until the season of Lent, while many Catholics celebrate it as a single day.

A Closer Look at the Song

A good source for information on the meaning of each of the verses of this song is a web page maintained by Dennis Bratcher (see below for the reference). After reviewing some of the differing opinions about whether this song was designed as a catechism or not, Bratcher concludes:

However, on another level, this should not prevent us from using the song in celebration of Christmas. Many of the symbols of Christianity were not originally religious, including even the present date of Christmas, but were appropriated from contemporary culture by the Christian Faith as vehicles of worship and proclamation. Perhaps, when all is said and done, historical accuracy is not really the point.  Perhaps more important is that Christians can celebrate their rich heritage, and God’s grace, through one more avenue this Christmas. Now, when they hear what they once thought was only a secular "nonsense song,"  they will be reminded in one more way of the grace of God working in transforming ways in their lives and in our world.  After all, is that not the meaning of Christmas anyway?

day1-12On the 1st day of Christmas my true love gave to me…

A Partridge in a Pear Tree represent Jesus the Christ, the Son of God, whose birthday we celebrate on December 25, the first day of Christmas. In the song, Christ is symbolically presented as a mother partridge that feigns injury to decoy predators from her helpless nestlings, recalling the expression of Christ’s sadness over the fate of Jerusalem:

"Jerusalem! Jerusalem! How often would I have sheltered you under my wings, as a hen does her chicks, but you would not have it so . . . ." (Luke 13:34)

    

day2-12

On the 2nd day of Christmas my true love gave to me…

Two Turtle Doves represent the Old and New Testaments, which together bear witness to God’s self-revelation in history and the creation of a people to tell the Story of God to the world.

God gave His greatest gift to believers, His son Jesus Christ. He also gave us his word, the Christian Holy Bible made up of the Old Testament and the New Testament, communicated by the Holy Spirit, first through the patriarchs and prophets and then through the apostles. The Old Testament was God’s covenant with Israel:

"I will take you for my people, and I will be your God" (Exodus 6:7)

    

(Note: The above information by Dennis Bratcher is used with full attribution to his work. However, when I attempted to comply with his procedure to obtain prior permission to use this material, the email link was “dead” and therefore unusable. This note is being inserted to assure that he is credited with the authorship.)

    

Background and biographical information is from Wikipedia articles on:

Twelve Days of Christmas can be found at…
http://en.wikipedia.org/wiki/12_Days_of_Christmas

Also See:

How Stuff Works: What are the 12 Days of Christmas…
http://christmas.howstuffworks.com/traditions/twelve-days-christmas.htm

CRI/Voice Institute (Dennis Bratcher): The Twelve Days of Christmas…
http://www.crivoice.org/cy12days.html

by Gerald Boerner

  

JerryPhoto_8x8_P1010031Today, in 1959, Alaska became our 39th state. We had acquired the territory from Russia in 1867 and it underwent a population boom during the 1890s Gold Rush in the Yukon. We remember it for a major sled race each year (Iditarod Trail Sled Dog Race that starts in Anchorage and ends in Nome), the tallest mountain in North America (Mt. McKinley) and a wonderful wilderness park (Denali National Park). Many from the “lower 48 states” have traveled to Alaska through the Inside Passage, seen the glaciers, and other points of interest.   GLB

    

“Alaska has great potential for new oil and gas development.”
— Frank Murkowski

“One of Alaska’s strengths is our pioneer role in environmentally sensitive development.”
— Frank Murkowski

“Really, I didn’t like Alaska. It rained, almost every day, at least 300 days out of the year.”
— John Hawkes

“This was one of the places people told me to go, it was one the big trips that you should see: Alaska.”
— Jeff Goldblum

“A changing environment will affect Alaska more than any other state, because of our location. I’m not one though who would attribute it to being man-made.”
— Sarah Palin

“I don’t think I can tell any stories about how I lived in a van in Alaska. I grew up in the suburbs, I even had my own room. We weren’t poor. Everything was very normal.”
— Lisa Loeb

“In one line of his poem he said good fences make good neighbors. I’d like to think that Alaska and British Columbia working together can prove that we can be pretty darned good neighbors without fences.”
— Dan Miller

“To live anywhere in the world today and be against equality because of race or color is like living in Alaska and being against snow.”
— William Faulkner

The State of Alaska

Alaska-Size Alaska is the largest state of the United States of America by area; it is situated in the northwest extremity of the North American continent, with Canada to the east, the Arctic Ocean to the north, and the Pacific Ocean to the west and south, with Russia further west across the Bering Strait. Approximately half of Alaska’s 698,473 residents reside within the Anchorage metropolitan area. As of 2009, Alaska remains the least densely populated state of the U.S.

The U.S. Senate approved the purchase of Alaska from the Russian Empire on March 30, 1867, for $7.2 million at about two cents per acre ($4.74/km2). The land went through several administrative changes before becoming an organized territory on May 11, 1912, and the 49th state of the U.S. on January 3, 1959. The name “Alaska” (Аляска) was already introduced in the Russian colonial time, when it was used only for the peninsula and is derived from the Aleut alaxsxaq, meaning “the mainland” or more literally, “the object towards which the action of the sea is directed”. It is also known as Alyeska, the “great land”, an Aleut word derived from the same root.

Geography

Alaska has a longer coastline than all the other U.S. states combined. It is the only non-contiguous U.S. state on continental North America; about 500 miles (800 km) of British Columbia (Canada) separate Alaska from Washington state. Alaska is thus an exclave of the United States. It is technically part of the continental U.S., but is often not included in colloquial use; Alaska is not part of the contiguous U.S., often called “the Lower 48.” The capital city, Juneau, is situated on the mainland of the North American continent, but is not connected by road to the rest of the North American highway system.

The state is bordered by the Yukon Territory and British Columbia in Canada, to the east, the Gulf of Alaska and the Pacific Ocean to the south, the Bering Sea, Bering Strait, and Chukchi Sea to the west and the Arctic Ocean to the north. Alaska’s territorial waters touch Russia’s territorial waters in the Bering Strait, as the Russian and Alaskan islands are only 3 miles (4.8 km) apart. As it extends into the eastern hemisphere, it is technically both the westernmost and easternmost state in the United States, as well as also being the northernmost.

Alaska is the largest state in the United States in land area at 586,412 square miles (1,518,800 km2), much larger than Texas, the next largest state. Alaska is larger than all but 18 sovereign countries.

Counting territorial waters, Alaska is larger than the combined area of the next three largest states: Texas, California, and Montana. It is also larger than the combined area of the 22 smallest U.S. states.

Natural features

With its myriad islands, Alaska has nearly 34,000 miles (54,720 km) of tidal shoreline. The Aleutian Islands chain extends west from the southern tip of the Alaska Peninsula. Many active volcanoes are found in the Aleutians. Unimak Island, for example, is home to Mount Shishaldin, which is an occasionally smoldering volcano that rises to 10,000 feet (3,000 m) above the North Pacific. It is the most perfect volcanic cone on Earth, even more symmetrical than Japan’s Mount Fuji. The chain of volcanoes extends to Mount Spurr, west of Anchorage on the mainland. Alaska has the most volcanoes of any of the fifty US states. Geologists have identified Alaska as part of Wrangellia, a large region consisting of multiple states and Canadian provinces in the Pacific Northwest which is actively undergoing continent building.

Miners_climb_Chilkoot Miners and prospectors climb
the Chilkoot Trail during the
Klondike Gold Rush.

One of the world’s largest tides occurs in Turnagain Arm, just south of Anchorage – tidal differences can be more than 35 feet (10.7 m). (Many sources say Turnagain has the second-greatest tides in North America, but several areas in Canada have larger tides.)

Alaska has more than three million lakes. Marshlands and wetland permafrost cover 188,320 square miles (487,747 km2) (mostly in northern, western and southwest flatlands). Frozen water, in the form of glacier ice, covers some 16,000 square miles (41,440 km2) of land and 1,200 square miles (3,110 km2) of tidal zone. The Bering Glacier complex near the southeastern border with Yukon covers 2,250 square miles (5,827 km2) alone. With over 100,000 of them, Alaska has half of the world’s glaciers.

Climate

The climate in Juneau and the southeast panhandle is a mid-latitude oceanic climate (Köppen climate classification Cfb) in the southern sections and a subarctic oceanic climate (Köppen Cfc) in the northern parts. On an annual basis, the panhandle is both the wettest and warmest part of Alaska with milder temperatures in the winter and high precipitation throughout the year. Juneau averages over 50 inches (1,270 mm) of precipitation a year, while other areas receive over 275 inches (6,990 mm).[15] This is also the only region in Alaska in which the average daytime high temperature is above freezing during the winter months.

The climate of Anchorage and south central Alaska is mild by Alaskan standards due to the region’s proximity to the seacoast. While the area gets less rain than southeast Alaska, it gets more snow, and days tend to be clearer. On average, Anchorage receives 16 inches (406 mm) of precipitation a year, with around 75 inches (1,905 mm) of snow, although there are areas in the south central which receive far more snow. It is a subarctic climate (Köppen Dfc) due to its brief, cool summers.

Barrow_beach Barrow, Alaska is the
northernmost city
in the United States.

The climate of Western Alaska is determined in large part by the Bering Sea and the Gulf of Alaska. It is a subarctic oceanic climate in the southwest and a continental subarctic climate farther north. The temperature is somewhat moderate considering how far north the area is. This area has a tremendous amount of variety in precipitation. The northern side of the Seward Peninsula is technically a desert with less than 10 inches (250 mm) of precipitation annually, while some locations between Dillingham and Bethel average around 100 inches (2,540 mm) of precipitation.

The climate of the interior of Alaska is subarctic. Some of the highest and lowest temperatures in Alaska occur around the area near Fairbanks. The summers may have temperatures reaching into the 90s°F (the low to mid 30s °C), while in the winter, the temperature can fall below −60 °F (-52 °C). Precipitation is sparse in the Interior, often less than 10 inches (250 mm) a year, but what precipitation falls in the winter tends to stay the entire winter.

The highest and lowest recorded temperatures in Alaska are both in the Interior. The highest is 100 °F (38 °C) in Fort Yukon (which is just 8 miles (13 km) inside the arctic circle) on June 27, 1915, tied with Pahala, Hawaii as the lowest high temperature in the United States. The lowest official Alaska temperature is −80 °F (-62 °C) in Prospect Creek on January 23, 1971, one degree above the lowest temperature recorded in continental North America (in Snag, Yukon, Canada).

AlaskaRailroad Alaska Railroad “Glacier
Discovery” train

The climate in the extreme north of Alaska is Arctic (Köppen ET) with long, very cold winters and short, cool summers. Even in July, the average low temperature in Barrow is 34 °F (1 °C). Precipitation is light in this part of Alaska, with many places averaging less than 10 inches (250 mm) per year, mostly in the form of snow which stays on the ground almost the entire year.

Demographics

The United States Census Bureau, as of July 1, 2008, estimated Alaska’s population at 686,293, which represents an increase of 59,361, or 9.5%, since the last census in 2000. This includes a natural increase since the last census of 60,994 people (that is 86,062 births minus 25,068 deaths) and a decrease due to net migration of 5,469 people out of the state. Immigration from outside the U.S. resulted in a net increase of 4,418 people, and migration within the country produced a net loss of 9,887 people. In 2000 Alaska ranked the 48th state by population, ahead of Vermont and Wyoming (and Washington D.C.). Alaska is the least densely populated state, and one of the most sparsely populated areas in the world, at 1.0 person per square mile (0.42/km²), with the next state, Wyoming, at 5.1 per square mile (1.97/km²). Alaska is the largest U.S. state by area, and the sixth wealthiest (per capita income).

Culture

Some of Alaska’s popular annual events are the Iditarod Trail Sled Dog Race that starts in Anchorage and ends in Nome, World Ice Art Championships in Fairbanks, the Alaska Hummingbird Festival in Ketchikan, the Sitka Whale Fest, and the Stikine River Garnet Fest in Wrangell. The Stikine River features the largest springtime concentration of American Bald Eagles in the world.

The Alaska Native Heritage Center celebrates the rich heritage of Alaska’s 11 cultural groups. Their purpose is to enhance self-esteem among Native people and to encourage cross-cultural exchanges among all people. The Alaska Native Arts Foundation promotes and markets Native art from all regions and cultures in the State, both on the internet; at its gallery in Anchorage, 500 West Sixth Avenue, and at the Alaska House New York, 109 Mercer Street in SoHo.

Alaska Natives – Inuit, Inupiaq or Yupik drummers and dancers – give informal performances in the lobby of the Alaska Native Medical Center in Anchorage on weekday evenings.

Other Events on this Day
  • In 1777…
    A Patriot army under General Washington defeats the British in the Battle of Princeton, New Jersey.
  • In 1870…
    Construction on the Brooklyn Bridge begins.
  • In 1947…
    Congressional proceedings are televised for the first time as part of the 80th Congress’s opening ceremonies and are broadcast in a few cities.
  • In 1959…
    Alaska becomes the forty-ninth state.

Dates and events based on:

William J. Bennett and John Cribb, (2008) The American Patriot’s Almanac Daily Readings on America. (Kindle Edition)

Background information is from Wikipedia articles on:

The State of Alaska can be found at…
http://en.wikipedia.org/wiki/State_of_Alaska