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08-20-2011, 05:43 PM   #1
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Pentax PKA Mount

can you use this lens on a Kr
is it an old lens?
Pentax PKA Mount
Sigma Lens
28-80mm 1:3.5-5.6 Macro

08-20-2011, 05:54 PM   #2
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Supports all exposure modes (Auto, P, Tv, Av, and M) Does everything a "new" lens does except Auto Focus. Have fun!
08-20-2011, 05:57 PM   #3
Ash
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This lens should work as you'd expect it to on any other Pentax camera. Assuming it's an autofocus lens, then AF should work also. Enjoy.
08-21-2011, 02:00 AM   #4
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thank you
found one very cheap
thinking of adding to collection

08-27-2011, 02:13 AM   #5
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You can surely use a older PK-A lens, it will be well supported on K-r. You should set the custom function 22 to 2 (Menu C4) and you're off to go. Otherwise in the default setting (1) your camera won't fire with such a lens attached if the aperture ring is not set to "A" only.

In my opinion old & cheap zooms are not worth the hassle. They are designed for film, yet dSLR are much more prone to flare and ghosting, so don't expect to get anything but substandard results from such an old lens design. It is a little different with older prime lenses, these have less moving glass elements and can sometimes be a real surprise.

I have an old Tokina f2.8/28mm which I got in almost unused condition for a price that made me smile. It is a very good performer and it fits nicely between my DA15 and DA35 Limiteds. It can't quite play in the same league as the Ltds but it beats the DA18-55II hands down. The Tokina focuses smoothly only the aperture ring is a bit hard, should be lubricated one day. I absolutely love the form factor, it's a tiny lens and a joy to use.

Cheers,
D.
08-27-2011, 06:30 AM   #6
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QuoteOriginally posted by dragra Quote
In my opinion old & cheap zooms are not worth the hassle. They are designed for film, yet dSLR are much more prone to flare and ghosting, so don't expect to get anything but substandard results from such an old lens design.
True for many old manual zooms; zoom technology has just improved tremendously over the decades. Some are still quite usable, especially those with a fixed maximum aperture like my Vivitar-Komine Series 1 70-210/3.5 and Sears-Tokina 55-135/3.5.

But especially Sigma was not known for making quality zooms back then. Even some old Nikon zooms suck. And the Pentax M40-80 and A28-80 and A35-80? Ick! As for flare: Use a hood.
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