Blurry imace follow-up

[wmchauncey]

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?

[kal]

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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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)

[DarkPenguin]

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.....

[wmchauncey]

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.....
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[wmchauncey]

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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