4th February 2004, 11:16 PM
Tech Queries : Lens - How To .....?
Does anybody out there knows how to distinguish lens "infected" by fungus? How to clean it (if you can DIY)? Tip on identification of defects?
Any references? Such as books or other sources?
Pls share your ideas and valuable experiences?
5th February 2004, 09:57 AM
A fungus infested lens can easily be identified by holding it against a light source and look through the glass. If the infestation is severe enough, you might see spider crawling inside... joking ! But you will see cobweb like, whitish/yellowish/bronwnish growth somewhere in the lens. Sometimes the growth might be so severe that it covers the whole lens surface.
Cleaning of lens fungus beyond the front and rear surfaces will require dismantling of the lens. You will probably need certain special tools like rubber bunk and lens wrench to dismantle the lens. Cheaper modern electronic AF lenses might be worse as some with barrels made of plastic and the assembly might be a permanent one with no option for dismantling.
Putting it back is another challenge, especially on those zoom lenses. Hence I do not recommend such action unless the lens is to be junked anyway, and you would like to see how a camera lens is like beyond the aperture and focussing rings. It's better to leave it to the professionals for a valuable lens.
Hope this helps.
6th February 2004, 12:18 AM
Thanks for the valuable info.
Originally Posted by e905591s
I was wondering how do the professional cleans the lens which we sent for service, especially those lens that are very difficult to dismantle. I believe the current lens construction has been made to minimise the number of parts for dismantle but rather sections of parts which are sealed tight.
Any further discussions. Although this may sound boring , doesn't it ring a bell on how it is done. We don't just leave things to the experts and do not explore the know -how behind.
Any lens experts ? Or enthusiasts.