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Photography and Photoshop Tutorials
 
Film Speed Table
A table of film speeds, E.I.'s in 1/3 stop increments.
 

Knowing the film speeds can be useful in applying filter factors and making general exposure calculations. Following is a listing of the film speeds (E.I.'s) in 1/3 of a stop increments.

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To calculate the exposure correction for a filter simply take the amount of in stops and subtract that from the E.I. using the table below and then use that re-calculated film speed to make your exposure calculations.

To convert from filter factor to stops is a little less clear. A factor of 2 is a one stop increase, 3 is 1.5 stops and 4 is 2 stops. As it goes on 6 is 2.5 stops and 8 is 3 stops.

I always calculate the correction values of my filters in 1/3's of a stop not factors. Filter factors are the construct of a warped mind and are an unnecessary level of distraction and indirection.

No, no attitude… I really do love filter factors. /snark

It is just more direct to make a correction without having to calculate the factors difference in stops prior to making the correction.

Mark the correction amount on the filters case or some tape on your filter pouch. I call the thirds .3 and .6 so that a correction of 1.3 is an increase in exposure of 1 1/3 stops, 1.6 is an increase of 1 2/3 stops. Using this method a P1 circular polarizer has a correction of 1.6 stops.

3.2 20 125 800 5000
4 25 160 1000 6400
5 32 200 1250 8000
6.4 40 250 1600 10000
8 50 320 2000 12000
10 64 400 2500 16000
12.5 80 500 3200 20000
16 100 640 4000 ...

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Contents
 
Profile Extents Test Target
 
Precisely target the high and low values in your prints...

Day for Night Photography
 
Reality is not always exactly that...

Luminance Masking for Contrast Control
 
Using luminance masks on adjustment layers to control specific tonal ranges in your image.

HDR Luminance Masking
 
Using a simple Low Pass Luminance Mask to create a HDR image

HDR Burning and Dodging
 
Use a HDR photo stack and transparency masks to get excellent results with this burning and dodging like method.

Profiling Your Digital Camera
 
Free utility to build and edit profiles from Adobe Labs

Using the X-Rite Color Checker to Create Camera Profiles
 
This really optimizes the color output of your camera!

Using the Photoshop History Palette and Snapshots Effectively...
 
Or, whos your friend baby...

Using the Photoshop Threshold adjustment layer to evaluate image density and contrast for digital printing.
 
This is an easy method to target a files density for printing. It requires a basic knowledge of Photoshop adjustment layers.

Building Photographic Websites
 
I make websites for artists and find that most folks need some sage advice on the process...

I got a new film camera, the Gaoersi 617
 
Direct from Hong Kong

Camera Settings for Digital Photography
 
How to set your digital camera to get the best images possible

Filters for Color Digital and Film Photography
 
Use these filters to improve the color and rendition of your photographs.

Basic Daylight Exposure (BDE) Calculation
 
For outdoor photography the light meter is not always your friend...

Film Speed Table
 
A table of film speeds, E.I.'s in 1/3 stop increments.

Bellows Extension Calculator
 
Online bellows extension factor and exposure compensation calculator and printable exposure compensation scale

Spotting Flecks on Ink Jet Prints
 
Using Marshalls retouching dyes to remove those occasional flecks

Stretching Canvas Photographs
 
How to stretch photographs printed on canvas with inkjet printers.

 

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Web Site by Cooksey-Talbott Studio

Fine art photography of California by master nature photographer Cooksey-Talbott. Hundreds of beautiful photographs are displayed for sale online as raw or ready to hang images.

Cooksey-Talbott Gallery is an online gallery of nature photographs. The collection includes pictures of the High Sierra, Ansel Adams Wilderness, Yosemite, Trinity Alps, Sonora Pass, Santa Barbara Hills, East Bay Hills and Garin Park as well as hundreds of different waterfalls. Legacy images are from medium and large format film taken with the Mamiya RB-67 and a variety of 4x5 view cameras. Some of the more recent work is shot with a Nikon D200, Canon 5D Mark II and the Sony A7r.

We offer archival quality prints in a wide range of sizes and media. We print on a heavy art papers and canvas using a Canon iPF8300 44 inch 12 color printer with pigmented inks. Our images are first party prints made directly by the artist. Prints are signed and numbered and include a Certificate of Authenticity.

Ralph Cooksey-Talbott Thomas has been working as a photographer since 1972 when he moved to California from Michigan. During the 1970’s he studied under Ansel Adams in Yosemite. Ansel published one of his photographs in the portfolio section of his book "Polaroid Land Photography" Ansel and Orah Moore, another of Ansel’s students, suggested that he shorten his name to Cooksey-Talbott, and that is the name he has worked under since. Cooksey also studied at the San Francisco Art Institute and the San Francisco Academy of Art. He has lectured in photography at the U.C. Berkeley Extension, Studio One in Oakland and Santa Barbara City College. Cooksey is currently working as a photographer and facilitating S3-Photowalk.com which is a monthly photo walk that meets up in Niles California.