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03-26-2007, 08:10 AM   #16
PDL
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Join Date: Oct 2006
Location: Woodinville, WA USA
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Posts: 1,177
Well, in the case where you twist the lens to change the zoom that makes it difficult. However, if it is a push pull then it is possible - and it was done. Look at a Vivitar series 1 zoom from the mid to late 70's - my Fuj*ca 26-75mm zoom has DOF markings at 28mm 35mm 55mm and 75mm - it is possible. Even my Tokina 28-70mm that I got with my SF1 has some markings. I think (since I do not have any) Pentax primes have DOF markings - eventhough I would venture that most users do not know what to do with them. This is because they come from an environment where they have turned the control of focus, shutter speed and f stop over to the machine.

There have been many times when people come over to me and hand me their 500+ USD camera and say --- show me how to make this work like yours. Mostly P&S that look like an baby SLR - that result in dead center subjects, red eye from axial flash, blown highlights, sun at photographers back and the subject is squinting or the subject's feet are at the bottom and head is at the top of the frame - their face is to small to really tell who it is.
Actually I just hand the camera back to them (unless it is really cool then I play with it for a few minutes) and ask - have you read the manual? The looks I get --- priceless.

PDL

03-26-2007, 05:29 PM   #17
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Dana G's Avatar

Join Date: Oct 2006
Location: Masachusetts
Posts: 245
That's correct, push-pull zooms have DOF scales. My 70-210 A zoom has them, the 45-125 has them, but the new lenses - like the 16-45 or the 12-24 - don't have any way to indicate DOF because the zoom is controlled by a ring.

As far as I know all primes have them, but I don't have any FA primes except the Limited ones. I don't know about the 50/1.4 A prime, I have an A and an M version.
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