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PostPosted: Sun Dec 09, 2007 6:32 pm 
Hi,
I am looking to build myself a good DSLR system. Have decided on a Canon 400d body. have decided on getting the Sigma 17-70 f/2.8-4.5 which seems to me to be a versatile zoom range and affordable.
I however was concerned about the lens not being wide enough for my taste (1.6x f-length factor). So started considering the sigma 10-20. The addition of this lens is however a little prohibitive on my budget. A wide angle converter sounds like a more affordable option
Being a relative newbie into the dig-photography scene I had a few questions:
Was wondering if there are any wide angle converters compatible with the Sigma 17-70mm. How badly is the IQ affected.?
How do i check for its compatibility (is the size of the filter thread, the only info required(17-70 has a 72mm thread); Do step-up/down rings solve most compatibility issues?
What exactly is a 'zoom-through' converter? and last
Can any of you recommend a good converter to suit my purposes?
thanks in advance
regards
aditya


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PostPosted: Sun Dec 09, 2007 7:49 pm 
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Joined: Sat Sep 30, 2006 4:30 pm
Posts: 9823
Location: UK
Hi Aditya,

Hope you don't mind but I have moved your post here to the Sigma forum. Hopefully you will get a better response to your questions here. 8)

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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