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Internal lens cleaning

Armando Gonzalez Macia , Oct 14, 2001; 01:38 a.m.

Is it really so difficult to disassemble a lens,for example 100- 300mm/4.5-5.6 USM, in order to clean it ? Does any one out there has made this job ? If some one with the knowledge has done this, would you please tell me, step by step with diagrams and so ?

Another one: Which tools or tool set do i need to perform a lens disassembling ?


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Art Haykin , Oct 14, 2001; 04:43 a.m.

If you don't know camera optics, forget it! Any why do you want to clean it in the first place?

Fabrizio Giudici , Oct 14, 2001; 06:53 a.m.


the problem is not to be able to reassemble the lens parts, but to be able to reassemble them respecting the strict mechanical tolerances. In order to do this you need experience and _the proper tools_ (for calibration and so on).

Why do you want to clean internally the lens? A couple of particles of dust won't affect your pictures, and if you want them to be removed just take the lens to a tech lab, they will probably fix the problem by just blowing some air into your gear.

PS Consider that, if you don't have a dust-controlled environment, you'll be likely to _put_ in your gear more dust particles than you can remove...

Bruce McElhaney , Oct 14, 2001; 10:44 a.m.

Wow! Talk about opening a can of worms . . .

andrew schank , Oct 14, 2001; 11:57 a.m.

It takes a skilled technicion with the correct tools several hours of work to take apart and clean a modern zoom lens and put it back together-and even they often get as much dust in there when they are done as was there before they started. The dust will have zero effect on image quality. Would you also consider doing your own dental work if you had a few dental tools?

Armando Gonzalez Macia , Oct 14, 2001; 01:30 p.m.

Ok guys !! You all have convinced me. Thanks a lot.

Robert Kennedy , Oct 14, 2001; 02:22 p.m.

Bruce - if there are worms in your lens, you should probably just get a new one.....

Alex Lofquist , Oct 14, 2001; 07:52 p.m.

I remember dissembling a simple projection lens system (Petzval design with only 4 elements) and sure, even though I drew out the configuration, I goofed it up. I got one doublet backwards. After working with the imaging, I realized what had happened. A lot of work all over again! Well at least it was now clean.


Nicholas Dahmann , Oct 14, 2001; 09:17 p.m.

do not for any reason open up a lens. you will never get it back together, i have ruined 3 lenses doing it. I was able to fix 2 of my problems, but i've wasted far to much money being really stupid.

Mark Crame , Oct 15, 2001; 08:38 a.m.

I've got an ashtray made out of a lens I dissassembled.

I've got some tiny screws and a magnifying glass out of another Lens.

I've got an overdraft from the replaccement costs.



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