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Canon EF 28-135mm f/3.5-5.6 IS USM vs. Canon EF 24-105mm f/4L IS USM

What's the best way to test whether or not my lenses need to be calibrated?

Also, I've found the reviews on this site very helpful: Canon Digital Camera & Lens Reviews

Bob Lee
Mon, 18 Dec 2006 18:04:27 -0800

Short of doing extensive testing when you first get the lens and extensive testing later, you'll just have to base it on your intuition. If your lens start to act differently than before, such as producing blurry photos, not locking focus, etc.

If you are really serious about your photographs, or photography is your work, you might want to send your equipment back to the manufacturer every year for calibration. You can also send your equipment back to them to test if it is out of calibration.

Chieh Cheng
Thu, 21 Dec 2006 11:13:26 -0800

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Title: Canon EF 28-135mm f/3.5-5.6 IS USM Repair Estimate
Weblog: Camera Hacker
Excerpt: As I alluded to when I wrote the "Canon EF 28-135mm f/3.5-5.6 IS USM vs. Canon EF 24-105mm f/4L IS USM" article, my 28-135mm lens has failed or is out of calibration. It seems to fail to lock focus quite often and when it does lock focus, it's usually focused on the background, not the subject.
Tracked: Thu, 21 Dec 2006 12:25:12 -0800

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