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PostPosted: Tue Mar 25, 2008 4:23 pm 
From my understanding, DG are for full frame? and DC for crop frames? Am i correct? But would it be alright to get a DG lens for a crop framed camera? And when i want 50mm portrait for a cropped sensor, would that mean i need a 35mm prime lens?

sorry, i'm new to lenses.


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PostPosted: Tue Mar 25, 2008 4:31 pm 
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Don't worry. I'm always getting confused by these various acronyms! There's a nice glossary of the Sigma versions which you can read here.

Bob.

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Olympus OM-D E-M1 + M.Zuiko Digital ED 12-40mm f/2.8, Lumix 7-14mm f/4, Leica DG Summilux 15mm f/1.7 ASPH, M.Zuiko Digital 45mm 1:1.8, M.Zuiko Digital ED 75mm 1:1.8.
Leica D Vario-Elmar 14mm-150mm f/3.5 - f/5.6 ASPH.
OM-D E-M5, H-PS14042E, Gitzo GT1541T, Arca-Swiss Z1 DP ball-head.
Astrophotography: TEC 140 'scope, FLI ML16803 camera, ASA DDM60 Pro mount.


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PostPosted: Wed Mar 26, 2008 1:47 am 
Oh i already read that one. My concern is, even let's say on a Canon, an EF lens compared to an EF-S.... What are the benefits with going for a EF lens on a crop frame. Would that be a waste of money? And the same question as sigma, a 50mm standard lens would need to be multiplied by 1.5 regardless of it's built for a crop lens or full frame?

I'm starting to confuse myself hehe, let me try to elaborate.

a 50mm EF lens mounted on a crop body = 75mm

a 50mm EF-S lens mounted on a crop body still = 75mm

or

a 50mm EF-S lens mounted on a crop body = 50mm?

In the former is true, than what are the benefits for going EF rather than EF-S and in the same way as sigma, DG for DC


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PostPosted: Wed Mar 26, 2008 11:16 pm 
Both types of lenses would give you the same focal length on a cropped sensor body.

The benefit of using the full-frame lens though is that your picture will have higher quality (mostly in the borders though). This is due to the fact that the full frame lens projects an image larger than you sensor and therefore less of the lens border will be used and more of its center to create your picture. Lenses are always sharper and possess more contrast in the center.


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PostPosted: Thu Mar 27, 2008 12:04 am 
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Another benefit of avoiding lenses designed only for cropped sensor bodies is that your glass is fully compatible with a full-frame body should you choose to upgrade in a few years time.

Bob.

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Olympus OM-D E-M1 + M.Zuiko Digital ED 12-40mm f/2.8, Lumix 7-14mm f/4, Leica DG Summilux 15mm f/1.7 ASPH, M.Zuiko Digital 45mm 1:1.8, M.Zuiko Digital ED 75mm 1:1.8.
Leica D Vario-Elmar 14mm-150mm f/3.5 - f/5.6 ASPH.
OM-D E-M5, H-PS14042E, Gitzo GT1541T, Arca-Swiss Z1 DP ball-head.
Astrophotography: TEC 140 'scope, FLI ML16803 camera, ASA DDM60 Pro mount.


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