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View Poll Results: Whick one would you buy?
300 IS + 1.4 TCON 2 22.22%
100-400 IS 7 77.78%
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Old Jun 8, 2006, 3:41 PM   #1
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My main subject matter is motorsport. I currently use the 70-300 IS but often need more reach.

I have 2 choices the 100-400 or the 300 plus 1.4x tcon (giving me 420)

As I already have the 70-300 ISis the 100-400 a bit f a waste?

Would the prime give me better pictures?
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Old Jun 9, 2006, 11:46 AM   #2
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For motor sports, I would prefer the zoom, so 100-400L IS.
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Old Jun 13, 2006, 8:52 AM   #3
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Thought this would be a well discused topic :?
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Old Jun 13, 2006, 4:59 PM   #4
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1st_petrolhead wrote:
Thought this would be a well discused topic :?
It has been talked about numerous times. http://www.stevesforums.com/forums/v...mp;forum_id=65 Give em time more will chime in
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Old Jun 13, 2006, 9:35 PM   #5
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What camera are you using?The crop factor wuld have a impact on your length.If you are shooting with the 20D/30D then you are getting 480mm out of the 300mm already.I would also go with the zoom as it is a more functional lens for sports of all types.Also you would have almost the same focal length with the 100-400 as the 300 + 1.4 but you wouldnt have the versatility of the 100-400.
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Old Jun 14, 2006, 1:26 AM   #6
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If I were you and had two bodies, I would go for the prime, simply to get the best possible image quality. But if you only have one body, the 100 to 400 will have you similar results and allow more flexibility.
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Old Jun 14, 2006, 5:58 AM   #7
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The only reason to go for the prime is the slightly faster aperture...
-> IS is not going to make it for sport (since panning does not require IS as the previous link indicated with several examples of non-IS lenses panning)

If you do go for the faster lens then don't forget the Sigma 100-300 f/4 EX, this lens best the EF 300 f/4L in MTF and is a fast ZOOM instead. It's highly recommended: http://www.photozone.de/8Reviews/len...00_4/index.htm
"MTF (resolution)

The lens was capable to deliver absolutely excellent resolution figures in the MTF lab easily comparable to fix focals in the respective range. At 100mm it even scratches the sensor limits of the EOS 350D. At 200mm and 300mm the center resolution is already excellent at wide-open aperture whereas the borders remain in very good territory. Very impressive

... but then for not much more than the 100-400 IS, one can also spring for the even faster Sigma 120-300 f/2.8 EX which is excellent for any action photography (and can double as a 600mm f/5.6 with a 2x teleconverter)!
All @ 600mm: http://www.stevesforums.com/forums/v...mp;forum_id=11

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