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Old Apr 25, 2005, 8:36 AM   #1
mdbassman's Avatar
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There appears to be specs of dust on the inside on my Canon telephoto lens. Is there a way to clean the inside of the lens?
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Old Apr 28, 2005, 6:25 PM   #2
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No, and even if you could, it would just be back in a few months or so. You won't see it in your pictures so no worries. Some people have found hairs and other gunk in their lenses with no degradation in picture quality. I guess if you just bought it and it really bothers you then return it, but either way it's going to get in their. You only have to worry about dust on the sensor, and even then when you see it in your pics.

Hope this helps.

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Old May 5, 2005, 12:14 PM   #3
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Doesn't mould grow and will soon cause specks on the image ? Dust on the correct places will also cause problems. Is it really pointless to send it for cleaning. How much does it cost to send the lens for cleaning when it really affects the images ?
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Old May 5, 2005, 1:35 PM   #4
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konei wrote:
Doesn't mould grow and will soon cause specks on the image ?
Dust in the lens normally do not show up on the image - like dust on a sensor would

Theses particles are not in the focal plane and usually manifest as lost of contrast or glare (when their numbers become overwhelming), but do not show up on a picture. This is like looking through a dirty window when your eyes are focused on something afar - you don't 'see' the dirt (unless you focus your eye on it - which the lens can't).

This has to do a lot with a lens design: Compact zooms tend to 'bellow' in and out doubling/tripling their lenght like a bicycle pump - guess where all the pollens from the air go?
The dust will get in sooner or later no escaping here! :evil:

To minimize this look for lens with internal zooming (and internal focusing) - Theses lenses stay constant in size, i.e. no 'bicycle pump' effect and don't tend to s_uck outside air in with the vacuum created by the accordeon effect. They are also more balanced because their weight do not shift like on longer focal lenghts.
Internal focusing also helps since the internal moveable elements are smaller hence move faster than the entire front element. The front also remains fix and do not rotate which will help with the polarizer...
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