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Fungus inside Sigma 24-70mm f2.8 IF EX DG HSM

There are several colonies of fungus growing on the front elements, i cannot see them on the rear elements but its possible they are there too. I would like to take the front element off and clean that area myself but not sure where to start. I have successfully cleaned my Nikkor 17-35 in much the same way but that lens appears to be relatively easy compared to my sigma. Any guidance on what I might need and where to start would be great. Chris.

Posted by Anonymous on

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Posted on Jan 02, 2017

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SOURCE: questions on disassembly for sigma 400mm apo af

Hi
Sigma will not repair this lens as the fungs may be in the lens on the barrels and if thay could clean
or replace optics the fungs may come back so thay cannot give a guarantee I know someone who
cleans lenses let me know if you want to contack him

Posted on Nov 06, 2008

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SOURCE: I want to buy a Sigma APO 120-400mm f/4.5-5.6 DG

Hi yes all the functions will work on your eos

Posted on Jan 11, 2010

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SOURCE: I have read a lot about chromatic abberation and

All zoom lenses have softness at the edges and all have certain apertures that are the best for sharpness. You have to experiment to find the ones for your lens. Chromatic abberation is something you would have to use a magnifying glass on your computer screen to see. Don't worry about it.

Posted on Feb 24, 2010

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SOURCE: is the Canon EOS Digital Rebel compatable with Sigma's HSM motor

Hi
Yes it will work on you rebel it is a fullframe lens

Posted on Feb 24, 2010

Tri3mast
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SOURCE: I have quite a lot

Holy Smokes, well if I were you right now I'd put it back together and send it to Sigma for repair cause you dismantle a lens like that there is no way you are going to align those lens elements without the proper equipment.

Using anything more then lens cleaner for camera optics will in fact remove the coating from the lens.

What you have isn't like the lenses from a "View" camera where it was possible to remove one lens group and replace with another but, those lenses were made and used 70 years ago.

Lens technology has changed a bit since then.

I had a manual focus Nikon F2.8 lens one time that had a coating separation on the front element that caused some wicked flare. I took eye glass cleaner and Windex to it to remove the rest of the coating so I could continue the shoot. I then sent the lens to Nikon for repair.

Best of luck with that one

Posted on Apr 27, 2011

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