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Old May 31, 2005, 10:46 AM   #31
NHL
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Randy G. wrote:
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"...level/Contrast..."? (see attached crops). Being that these are magnified from the test center-crop images, it really doesn't say much for the Sigma's wide-open performance. And after all, that's what you are paying for. If it can't perform well in that situation, then what's the point of paying for the "2.8". I would rather spend it on the 50-500 and trade speed for length.
You can see clearly the CA on the Canon's too except they are of darker shade -> Lower the level on the sigma to match or increase the level on the Canon and you'll see the upper/lower horizontal blue fringes as well - BTW I can see some red fringe too right above your Canon lettering

Remember you're magnifying a crop of a crop ( - Pixels pipping) ??? :-) :lol: :G



Look at the 2nd link with a 2x TC - CA should be more telling then when magnified with a teleconverter... and in my opinion they are both quite useable still :?
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Old May 31, 2005, 4:06 PM   #32
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These charts will just make you gray before your time. Fine if your more interested in studying charts than taking photographs.

If you must, make your own test quickly and simply from the door of a local shop. Take the shots home on your card or film. Have a look and make a decision. Then just forget the rest. take photographs forgetting about sharpness, CA and the rest of that claptrap.

Try to make a judgment on what your eyes tell you mixed withyour instinctive feel. The more you go down the road of Pixels pipping (is that what its called) the more out of touch your gonna become. Photography is 80 percent base instinct. Where to point, where to beandwhen to press. the 20 percent understanding of how the machine works is not gonna make you anybetter from the million others that know the same stuff or a little less.
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Old Jun 6, 2005, 5:53 AM   #33
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Makes for interesting reading

http://www.photo.net/bboard/q-and-a-...?msg_id=00CQyD
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Old Jun 6, 2005, 6:13 AM   #34
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NHL, your right, autofocus and brokeh are great on the 70-200 f2.8 Sigma...

See below

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