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 Post subject: Fungus on lens
PostPosted: Fri Jun 01, 2012 12:09 pm 
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Joined: Thu May 29, 2008 3:02 am
Posts: 444
Location: Chennai
Hi All

How do we check whether our lens is effected by fungus?
Some of friend told me that at the rear end of the lens we need to torch light and at the same time we have to check from the front end..
Can we do it this way or is there any better way to check before giving it for service?
Please shed some light on this..

Regds
Mano

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Canon EOS 5D mk III|Canon EOS 7D | 70-200 F2.8 L IS II USM | 400 F5.6 L USM


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 Post subject: Re: Fungus on lens
PostPosted: Fri Jun 01, 2012 12:21 pm 
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Joined: Sat Sep 30, 2006 4:30 pm
Posts: 9811
Location: UK
Hi Mano,

Unless I was selling a lens I wouldn't even bother to check unless I thought there was a problem with images taken with the lens. And if the lens looks perfectly transparent when you shine a light through it then you are set. If in doubt you could always compare the transparency with a known good lens. But whatever you do don't be tempted to use the Sun as your bright light source if you value your eyesight!!!

Bob.

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Olympus OM-D E-M1 + M.Zuiko Digital ED 12-40mm f/2.8, Lumix 7-14mm f/4, Leica DG Summilux 15mm f/1.7 ASPH, M.Zuiko Digital 45mm 1:1.8, M.Zuiko Digital ED 75mm 1:1.8.
Leica D Vario-Elmar 14mm-150mm f/3.5 - f/5.6 ASPH.
OM-D E-M5, H-PS14042E, Gitzo GT1541T, Arca-Swiss Z1 DP ball-head.
Astrophotography: TEC 140 'scope, FLI ML16803 camera, ASA DDM60 Pro mount.


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 Post subject: Re: Fungus on lens
PostPosted: Fri Jun 01, 2012 4:50 pm 
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Joined: Sun May 25, 2008 12:48 pm
Posts: 8022
Location: UK
Just look in normal light. If you see anything on the lens surfaces (internal or external) that can't be explained by dust or other dirt, it could be fungus. Once it sets in, it has an organic pattern to it. You don't need any particular light as long as you can see.

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