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June 22nd, 2011, 04:28 AM
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#1 |
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Regular Crew
Join Date: Jan 2011
Location: Wylam
Posts: 46
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2x converter
I will be traveling in the summer and have bought a Sigma 18-250 which I use on my 7D, I know its far from the best lens but it suits my needs well. Traveling light is a priority and the 18-250 gives me a good compromise between traveling light and image quality v affordability.
Im thinking about a 2x converter as I may need to film video from a distance. I have looked at this one. Sigma DG tele-converters: Digital Photography Review At 500mm will my IS and AF still work and do you guys think it will provide decent results? Many thanks |
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June 22nd, 2011, 04:10 PM
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#2 |
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Major Player
Join Date: Mar 2009
Location: Ottawa, ON
Posts: 385
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Re: 2x converter
With that setup and a 2x converter, AF and IS won't work, the image will be very soft, low in contrast and chromatic aberrations may be quite bad.
A T3i would be a much better solution with it's 3x video crop mode. That's why I picked one up along with my 7D. |
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June 28th, 2011, 11:13 PM
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#3 |
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Trustee
Join Date: Apr 2006
Location: United States
Posts: 1,158
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Re: 2x converter
Kenko is what you want - its the factory version of the Tamron and maybe one or two others. my review of the 1.4X is here Kenko 1.4X Teleconverter Review . if the lens is a 4.5, then at about F8 1/2 ( 9.5) thats well past what the AF system will do.
if you want a LONG lens, try a Vivitar ( made by tokina ) 400mm 5.6 : review here Vivitar 400mm 5.6 Lens Review & Video : UPDATED which you can pick up on ebay for around $100 or so. it is heavy, but its a nice piece of glass, especially for the price. while you won't get AF, you may get AF confirm with a programmable adapter. |
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