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Old Aug 17, 2004, 5:53 PM   #1
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quick question hopefully not too dumb....

Sigma AF 1.4X and 2X APO EX Teleconverters added to the 70-200mm f2.8 EX APO IF HSM

what kind of zoom will that make it and is it still fast for action

(remember im a rookie with lenses)

i have the D70






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Old Aug 17, 2004, 7:39 PM   #2
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With 1.4x TC: 98-280 f/4.0 zoom
With 2x TC: 140-400 f/5.6 zoom

Focusing is still fast in bright light, but will hunt when in the dark... This is more due to the camera/lens combination than just the lens being slower, ie the AF on the 1Ds or MarkII will handle much better than the 10D for example with slower lenses because of their AF sensors.

The AF speed is also proportional to how steady you hold the lens at high magnification as well, ie if you're not steady then the camera will have a harder time focusing at 2x for example. :?
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Old Aug 17, 2004, 8:00 PM   #3
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ok thanks for answering back quick !
















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Old Aug 17, 2004, 10:17 PM   #4
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FYI

http://www.photosig.com/go/photos/browse?id=17486
http://www.photosig.com/go/photos/browse?id=17485
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Old Aug 18, 2004, 6:12 PM   #5
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You will find loosing those 2 stops on inside action is very important..

Dale
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Old Aug 18, 2004, 7:38 PM   #6
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yeah thats what i was afraid of, thanks for telling me that i wondering that


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Old Aug 19, 2004, 7:40 AM   #7
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Depending on the camera you can usually compensated for the lost by dialing up the ISO, but the camera's AF sensitivity is usually stuck with the same behind a slower lens...

Have you look at the 120-300 f/2.8? It's rated higher than most 70-200 f/2.8: http://www.photozone.de/2Equipment/easytxt.htm#Ztelel

... with some pictures link over here: http://www.stevesforums.com/forums/v...06&forum_id=65
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Old Aug 25, 2004, 1:44 PM   #8
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NHL, isn't that Sigma 120-300/2.8 like $2,200 or so? At roughly 3x the cost of the 70-200/2.8 it should be better.
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Old Aug 25, 2004, 2:54 PM   #9
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murphyc wrote:
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NHL, isn't that Sigma 120-300/2.8 like $2,200 or so? At roughly 3x the cost of the 70-200/2.8 it should be better.
Compare to a 300 f/2.8 it's actually a bargain but much more flexible when the subject get close!

BTW their 100-300 f/4 EX is sharper but cost less than a 70-200 f/2.8 + 1.4x TC, and obviously better... :-)
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