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costas60 · 08-20-2011, 05:43 PM

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

**mattt** · 08-20-2011, 05:54 PM

Supports all exposure modes (Auto, P, Tv, Av, and M) Does everything a "new" lens does except Auto Focus. Have fun!

Ash · 08-20-2011, 05:57 PM

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.

costas60 · 08-21-2011, 02:00 AM

thank you
found one very cheap
thinking of adding to collection

dragra · 08-27-2011, 02:13 AM

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.

RioRico · 08-27-2011, 06:30 AM

Originally posted by dragra

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.

08-20-2011, 05:43 PM	#1
costas60 Forum Member Join Date: Dec 2010 Location: Melbourne Posts: 86	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

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08-20-2011, 05:54 PM	#2
mattt Site Supporter Join Date: Feb 2011 Location: Niagara Photos: Gallery \| Albums Posts: 2,806	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 Community Manager Loyal Site Supporter Join Date: Mar 2007 Location: Toowoomba, Queensland Photos: Gallery \| Albums Posts: 22,695	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
costas60 Forum Member Join Date: Dec 2010 Location: Melbourne Posts: 86 Original Poster	thank you found one very cheap thinking of adding to collection

08-27-2011, 02:13 AM	#5
dragra Senior Member Join Date: Dec 2010 Location: Ljubljana Photos: Albums Posts: 238	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
RioRico Veteran Member Join Date: Jun 2008 Location: Limbo, California Posts: 11,264	Originally posted by dragra 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.