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Wide angle converter. Quality issues and Compatibility?

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?
Can any of you recommend a good converter to suit my purposes?
thanks in advance

Aditya Narula
Sun, 09 Dec 2007 16:46:38 +0000

Consider that the price difference between the Sigma 17-70mm and the Sigma 10-20mm lenses is slightly over $100, you'll be better off getting the Sigma 10-20mm lens.

A wide-angle converter is going to cost some money as well, especially the good ones. And any converter will probably not produce result as good as the native 10-20mm lens. A wide-angle converter that fits on a 72mm filter thread and will not vignette your image (if there is one) is probably going to cost more than an arm and a leg.

Chieh Cheng
Mon, 10 Dec 2007 05:58:53 +0000

I've used add-on auxiliary lens on all kinds of cameras, as they have be made since box cameras were sold. Bottom line: they do not make the lens wide enough or more telephoto enough to justify the loss of quality.

I tell my digicam students that, if these lenses were sooooo good, then why were removable lenses ever created!


John Socha
Fri, 22 Aug 2008 21:20:59 +0000

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