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09-17-2007, 08:43 AM   #1
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What's the difference between these lenses? (Sigma)

I'm looking at these lenses, both are in stock brand new and I can't figure out what the difference is..

Sigma 170-500mm f/5-6.3 APO

and..

Sigma 170-500mm f/5-6.3 APO DG

The DG version is actually $10 cheaper but the descriptions are identical.

My point is, if the DG is a Designed for Digital lens, why are the descriptions identical? The coatings don't mention anything different.

Thanks in advance.

09-17-2007, 08:55 AM   #2
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DG if I remember correctly is an anti-reflective coating. Digital SLRs are suceptable to internal reflections within the body due to reflection off the highly reflective image sensor.

DG is meant to reduce secondary reflections back onto the sensor from light that reflected off of the sensor onto the inner lenses, then back onto the sensor.

Hope I'm not making things up. Anyone else, please confirm or correct.
09-17-2007, 01:08 PM   #3
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I think DG is for digital APS-C format sensors (not full frame). Here is a description from Sigma's site. Sigma - Lenses - Overview
09-17-2007, 01:17 PM   #4
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QuoteOriginally posted by eman Quote
I think DG is for digital APS-C format sensors (not full frame). Here is a description from Sigma's site. Sigma - Lenses - Overview
I don't think that DG is for APS-C formats specifically. DC would be for that format. DG is digial multicoating and generally means that the lens can be used with film cameras too.

Stephen

09-17-2007, 02:41 PM   #5
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Correct. The non DG version is actually an older lens. DG just means it is optimized for digital cameras with a lens coating as mentioned above.
09-17-2007, 03:38 PM   #6
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QuoteOriginally posted by Tom M Quote
I'm looking at these lenses, both are in stock brand new and I can't figure out what the difference is..

Sigma 170-500mm f/5-6.3 APO

and..

Sigma 170-500mm f/5-6.3 APO DG

The DG version is actually $10 cheaper but the descriptions are identical.

My point is, if the DG is a Designed for Digital lens, why are the descriptions identical? The coatings don't mention anything different.

Thanks in advance.
The difference is that the non-DG APO is "brand new" as in "sitting on the shelf unsold for a few years", while the DG has modern coatings.
09-17-2007, 05:31 PM   #7
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Yep, DG=coating for digital, DC=for digital only (APS-C sensors)
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