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Roger Cicala | all galleries >> lenstest >> This is a 17-55 that had the internal dust magnet syndrome > sealremoved.jpg
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sealremoved.jpg
13-JUL-2007

sealremoved.jpg

With the seal removed you can see that there are pretty large openings around the edge of the front element mount. It might not be clear from the pictures, but those three slits (the screwdriver is in one) go straight into the lens body. I assume that if that seal isn't completely tight these provide a pretty easy path for dust into the body. This probably also explains why the dust problem only seems to affect those who don't use a UV filter (I don't use them, I'm convinced they affect IQ, but that's another issue altogether.) The three small screws are Phillips size 000. You can remove them and it looks like they're all that's holding the front mount in. Yeah, I'm thinking about it. I did try a Rocket blower into the slots but it didn't budge any dust as you can tell.

Canon EOS Digital Rebel XTi
1/40s f/6.3 at 40.0mm iso800 hide exif
Full EXIF Info
Date/Time13-Jul-2007 19:29:37
MakeCanon
ModelCanon EOS DIGITAL REBEL XTi
Flash UsedNo
Focal Length40 mm
Exposure Time1/40 sec
Aperturef/6.3
ISO Equivalent800
Exposure Bias
White Balance
Metering Modematrix (5)
JPEG Quality
Exposure Programaperture priority (3)
Focus Distance

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