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08-17-2012, 06:33 PM   #1
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Older Pentax lens

I have a Pentax 35-80mm (autofocus) lens from my last Pentax 35mm film DSLR.
I thought it should be equivalent to, or perform as a 1.5X focal length lens on my 200D, but it does not seem to do so.
I am not sure why this is the case. For instance if I use the 35mm position (so 35 X 1.5 = ~52mm) on the lens, photos are not the same as on my kit lens at 55mm. Not that this really matters but I was surprised.

Sean

08-17-2012, 06:55 PM   #2
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Focal length is focal length no matter which camera it is on. Compare the 35-80 @ 35mm with the 18-55 @ 35mm and they will be the same.

Unless you change back and forth from FF to APS-C just ignore the whole 1.5x thing it just confuses people. The angle of view will be different on different cameras but the focal length is the same.
08-17-2012, 07:04 PM   #3
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They're both marked using the same scale. Try looking through each viewfinder (the old SLR and the new dSLR) and you'll see a difference in angle of view, but each is marked using the same scale so 35mm on the new should equate to 35mm on the old lens.
08-18-2012, 05:22 AM   #4
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Put the 18-55 kit lens on the K200D and set it to 55mm.
Put the 35-80 on your old Pentax SLR and set it to roughly 80mm

The view will be (more or less) the same.

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