Showing posts with label F-Stop. Show all posts
Showing posts with label F-Stop. Show all posts

Monday, June 13, 2011

MK Direct Photo e-Box 1419 - NYBG Mod - Preview

I just received a new MK Direct Photo e-Box 1419 with a modified opening on top.

Jaime, Felix and Ruben at MK Direct have been exceptionally helpful with this project. I thought I was going to have to make modifications to the box myself, but when I explained what I needed, they generously offered to do it for me.

The results are fantastic. This is the first shot I took with the new box using the Canon Eos 1ds Mark III with a 50mm Macro lens:


Eysenhardtia officinalis

Tuesday, June 7, 2011

F-Stop - Sharpness

While it is common to shoot copy work using a small aperture in order to achieve maximum depth of field, I recently ran some tests shooting at f20 and and f8 and here is what I found.

f 20 on the left, f 8 on the right

These images have not been sharpened in Photoshop. They were both shot with the Canon Eos 1ds Mark III using the EF50mm/f2.5Macro lens. It is clear that the f8 image is significantly more clear than the f20. Not surprising news, I know, but it's fun to shoot tests to confirm.

Here are larger images for your enjoyment.

f8

f20

Wednesday, April 13, 2011

Copy-Stand Photography

The traditional repro-photography set up is usually a camera mounted on a copy stand with two lights set at 45 degree angles to the shooting surface. Usually the simplest solutions work the best.

Here is our newly refurbished copy-stand at The New York Botanical Garden Herbarium:


The camera is a Canon Eos 1ds Mark II, the lights are Speedotron Black Line strobes with Chimera soft-boxes to diffuse the light and eliminate any shadows. Since this photo was taken, the camera has been replaced with a Canon Eos 1ds Mark III producing 21 megapixel shots.This set-up is a significant upgrade over its predecessor.

When I started at the Herbarium, this is what it looked like this:


This set-up was once used for specialized purposes. The lights were bare bulbs and there was a white plastic diffusion tent with top had removed and strings holding the side walls up - of course, this meant that the lights could not be moved. Unfortunately, the light was not very even. You can see where people had tried to cut the light by taping pieces of paper and neutral density filters to the diffusion tent.

We now have two stations like the one shown up top. By standardizing our two shooting stations, any special training or operator skills have been eliminated - leaving the photographers to focus their attention on the subject matter. The f-stop, shutter speed, and color balance is the same for both stations, which means that the photographer can just come in and start shooting at either station. The standardized results from the two shooting stations means that image processing and quality control goes much faster. The need to re-shoot specimens for quality reasons has been all but eliminated and productivity is up over 25%.