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peru · 09-10-2010, 03:12 PM

There is a friend of mine selling a Sigma 170-500mm non-DG lens.
We are in different countries, so I cannot test it and if possible, will try to avoid moving it from one place to another.
Since DG lenses are optimized for digital cameras, I was wondering if it will be a problem to use this non-DG lens in my K20D.
What would be the negative points in the actual pictures?
Is this DG marking a real thing or is it just marketing?

Thnx!

Adam · 09-10-2010, 03:18 PM

There wouldn't really be a problem. DG just means "optimized for digital, full-frame supported", so you should be fine when using a regular sigma lens, as there really isn't much of a distinction.

Check this lens database for more details: Sigma Lenses - Pentax Third-Party Lens Review Database

Reportage · 09-10-2010, 04:36 PM

I think there are Pentax users with either Sigma DG or Pentax FA lenses with the hope one day, FF will be a reality.

Then again, they could go the 645D route which uses larger then FF sensor if i remember correctly or go back to using film.

Arpe · 09-12-2010, 05:53 PM

No problem. I use a non-DG Sigma for 90% of my photos on my K-7, and also did on my K20D. Of course you may still get some fringing on high contrast areas, maybe a bit worse than a DG lens, but for me that happens about one photo out of every 1000.

09-10-2010, 03:12 PM	#1
peru New Member Join Date: Sep 2010 Photos: Gallery Posts: 6	Would a SIGMA non-DG lens be a problem in a K20D? There is a friend of mine selling a Sigma 170-500mm non-DG lens. We are in different countries, so I cannot test it and if possible, will try to avoid moving it from one place to another. Since DG lenses are optimized for digital cameras, I was wondering if it will be a problem to use this non-DG lens in my K20D. What would be the negative points in the actual pictures? Is this DG marking a real thing or is it just marketing? Thnx!

09-10-2010, 03:18 PM	#2
Adam Administrator Site Webmaster Join Date: Sep 2006 Location: Arizona Photos: Gallery \| Albums Posts: 51,608	There wouldn't really be a problem. DG just means "optimized for digital, full-frame supported", so you should be fine when using a regular sigma lens, as there really isn't much of a distinction. Check this lens database for more details: Sigma Lenses - Pentax Third-Party Lens Review Database Adam PentaxForums.com Webmaster (Site Usage Guide \| Site Help \| My Photography) PentaxForums.com server and development costs are user-supported. You can help cover these costs by donating or purchasing one of our Pentax eBooks. Or, buy your photo gear from our affiliates, Adorama, B&H Photo, KEH, or Topaz Labs, and get FREE Marketplace access - click here to see how! Trusted Pentax retailers:

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09-10-2010, 04:36 PM	#3
Reportage Veteran Member Join Date: Feb 2009 Photos: Gallery Posts: 739	I think there are Pentax users with either Sigma DG or Pentax FA lenses with the hope one day, FF will be a reality. Then again, they could go the 645D route which uses larger then FF sensor if i remember correctly or go back to using film.

09-12-2010, 05:53 PM	#4
Arpe Pentaxian Join Date: Sep 2006 Location: New Zealand Photos: Gallery \| Albums Posts: 4,452	No problem. I use a non-DG Sigma for 90% of my photos on my K-7, and also did on my K20D. Of course you may still get some fringing on high contrast areas, maybe a bit worse than a DG lens, but for me that happens about one photo out of every 1000.

Would a SIGMA non-DG lens be a problem in a K20D?

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