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03-17-2012, 05:56 PM   #1
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What FOV will i get if i attach DA limiteds to a FF

hi guys im just curious to know if pentax come out with a FF, can i use the DA ltd with it. and what FOV willl i get for

DA 15 and DA 35

thanks

03-17-2012, 06:03 PM   #2
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For the 15mm you'll almost see a perfect circle with black edges around it, and for the 35mm just some vignetting. For the theoretical FOV, refer to this:


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03-17-2012, 06:42 PM   #3
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to be sure DA 15mm will be wider in a FF but will have dark corners.that means i can crop it to the size it would be if it was attached to a crop sensor and would not see the dark corners ?
03-17-2012, 06:55 PM   #4
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Yup, you can always crop.


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03-17-2012, 08:23 PM   #5
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Here's a history lesson on that very subject..
/pentax-slr-lens-discussion/31629-da-lens-full-frame-test-shots-thread - sadly, quite a few dead image links but plenty of text.
03-17-2012, 08:25 PM   #6
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Any Pentax-compatible lens can be mounted on any PK-mount SLR, so to that extent, using DA lenses on FF cameras is quite feasible. How well you like the results is another matter. I tend not to put my few DA lenses onto my full-frame K1000 or ZX-M or MV1 -- the vignetting is just too severe.

There's also a little problem with metering. A lens like the DA15Ltd on a FF camera will indeed give a full-circle image surrounded by blackness. The maximum diameter of that circle is 24mm, with an area of pi*12^2 or ~452mm^2. The frame area is 864mm^2, so the circle occupies up to ~52% of the frame, with the rest black. This will seriously throw-off the exposure if you use matrix metering. That's easy to compensate for on a digicam but can cause some wasted film unless accounted for.
03-18-2012, 05:18 AM   #7
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You'll just need to get a SMC Pentax-A 15mm F3.5 for your FF camera, no vignetting at all then.
03-18-2012, 06:15 AM   #8
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Funny thing is Pentax have already said not to expect a FF in a shortwhile and a FF will be expensive.

If you want FF now is the time, get a good secondhand D700 or 5D mkII, now that their new FF are here those might be cheap and plenty full on the secondhand market.

03-18-2012, 06:46 AM   #9
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I remember the DA15 pic from the above thread. there was significant vignetting. It's also likely that Pentax will include software (if they release a FF) that automatically crops DA lenses to APSC size like CaNikon does (AFAIK). Can you override that function on the CaNikon?
03-18-2012, 01:32 PM   #10
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Yep, you can.
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