Just divide the bellows extension by the aperture diameter and you have your f/stop value...
Just divide the bellows extension by the aperture diameter and you have your f/stop value...
"I love my Verito lens, but I always have to sharpen everything in Photoshop..."
Thanks Mark, and Garrett. This is the simplest and easiest to remember explanation I've heard. I have, and have used, the Quick Disk, and it is easy and effective, but when I am wandering around I never have it with me (I could stick it in my bag, I guess).
Simple is, as simple does.
Garrett
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Would the plots in this article be usefull for bellows compensation in the field?
Certainly would be an easy quick reference.
http://people.umass.edu/~rbhome/bellows15.pdf
The chart in fig. 3 and a tapemeasure could be carried in the field, but it's better just to learn and remember the rule. It's really quite simple, and you're not as likely to leave your brain at home.
One man's Mede is another man's Persian.
I think goamules has it right: Keep it simple. Find a simplified way to make the inverse square law work for you in the field and work with it till its automatic for you.
While I do not use this method, one way to simplify the correction would to pre figure the correction in thirds or quarters of a stop for your commonly used lenses and lay out a scale on the bed or rail of your camera. A different scale for each focal length of course.
This way you only calculate the correction once for each lens.
Drew Bedo
www.quietlightphoto.com
http://www.artsyhome.com/author/drew-bedo
There are only three types of mounting flanges; too big, too small and wrong thread!
Sorry, I really shouldn't have talked about infinity. I meant no bellows extension if the subject on which I was focusing was farther than 8 x focal length of lens from the camera (didn't worry about farther from lens or farther from film plane or farther than somewhere else on the camera, since I was just eyeballing it anyhow I didn't think I needed to get that precise).
Brian Ellis
Before you criticize someone, walk a mile in their shoes. That way when you do criticize them you'll be
a mile away and you'll have their shoes.
Vaughn: You are so right!
Drew Bedo
www.quietlightphoto.com
http://www.artsyhome.com/author/drew-bedo
There are only three types of mounting flanges; too big, too small and wrong thread!
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