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Author Topic: Blurry imace follow-up  (Read 2772 times)
wmchauncey
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« on: June 15, 2007, 07:04:03 AM »
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You may remember my complaint about RAW shooting a cell tower 1/2 mile away and getting blurry images, esp. at 100% in ACR using cheap Sigma glass.  Well, I repeated the experiment using a Canon 17-85 f/4-5.5 IS on my Rebel xti.  It was like the lights were turned on.  Throughout the setting range, the Canon stayed clear to well over 100%.  Pixelating, that had occured at 200% with the Sigma, didn't occur until 400% with the Canon glass.

Can this problem be fixed except by pouring more dollars into the glass,  I'm trying to avoid buying the Canon 70-300 f/4-5.6 IS as well as the one listed above?
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kal
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« Reply #1 on: June 15, 2007, 09:38:01 AM »
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You may remember my complaint about RAW shooting a cell tower 1/2 mile away and getting blurry images, esp. at 100% in ACR using cheap Sigma glass.  Well, I repeated the experiment using a Canon 17-85 f/4-5.5 IS on my Rebel xti.  It was like the lights were turned on.  Throughout the setting range, the Canon stayed clear to well over 100%.  Pixelating, that had occured at 200% with the Sigma, didn't occur until 400% with the Canon glass.

Can this problem be fixed except by pouring more dollars into the glass,  I'm trying to avoid buying the Canon 70-300 f/4-5.6 IS as well as the one listed above?
[a href=\"index.php?act=findpost&pid=122956\"][{POST_SNAPBACK}][/a]

Well, you could buy second-hand glass... or you could stop looking at your photos at 400%. Assuming your monitor is capable of 96dpi, a 400% zoom is like looking at a 24dpi print. Assuming you use the full 3888x2592 resolution your camera is capable of, this means making a 4x2.7m print... are you really going that large?

(sort-of joking, I'm really happy I've spent quite a lot of euros on good Canon glass)
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DarkPenguin
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« Reply #2 on: June 15, 2007, 10:26:33 AM »
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Are you sure it isn't the IS that's saving you?

Oh, and almost all lenses have an operating window where they are very good.  Even cheap ones.  (The Canon 18-55 is nice from f8-f11 as you get closer to 55mm.)  The window may be small but if you find that window and can stick to using it.....
« Last Edit: June 15, 2007, 10:29:27 AM by DarkPenguin » Logged
wmchauncey
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« Reply #3 on: June 15, 2007, 11:13:42 AM »
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Are you sure it isn't the IS that's saving you?

Oh, and almost all lenses have an operating window where they are very good.  Even cheap ones.  (The Canon 18-55 is nice from f8-f11 as you get closer to 55mm.)  The window may be small but if you find that window and can stick to using it.....
[a href=\"index.php?act=findpost&pid=122991\"][{POST_SNAPBACK}][/a]
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wmchauncey
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« Reply #4 on: June 15, 2007, 11:17:08 AM »
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[a href=\"index.php?act=findpost&pid=122997\"][{POST_SNAPBACK}][/a]
oops
Tripod used in all tests-I raise the magnification to see how much cropping I can get away with as well as checking glass quality
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The things you do for yourself die with you, the things you do for others live forever.
A man's worth should be judged, not when he basks in the sun, but how he faces the storm.

My stuff...http://1x.com/member/chauncey43
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