Hi All

I have noticed few white particles inside my 28-105mm USM lens. This is not on the glass. It is on those black part that moves back and forth while zooming. It is visible when I look through the front of the lens. It glows while showed towards light. Is it fungus? My lens is just 3 months old. What can I do to prevent my lens from getting fungus? Also the lens has a bit play. It produces a little sound if I shake it slowly.

Another problem that I noticed on my 50mm/1.8 is a small tick tick sound. It can be heard only if I hold the lens loose and shake it slolwy. The sound is still there and very low when hold the lens tight. There is no problem with the pictures which are taken with both of these lenses. Should I take it to a service center and check it. I am affraid to take it becuse I do not want a service center to open it and fiddle around unless untill these problems are going to lead me to some serious issues in the near future. Some one please reply.

I am worried after reading an article about choosing a used lens. That suggest to check for the lens play and says there should not be any play between the outer cover and movind inside covers.

Regards

-- John Peter (eosquestions@yahoo.com), March 18, 2002

Answers

1. If you look through the lens from the viewfinder side, the image will be fine and so will the picture if you take one. I never worry about all the specks and particles in my lenses--I no longer look or want to know--and the pictures are great.

2. The barrel and gear train of the EF 50 1.8 are made of plastic. The barrel and gear train are built to loose tolerances to allow for expansion (plastic grows a lot in the sun). They rattle when shook. Furthermore, all plastic lens barrels have play in them.

3. The person that wrote the article is referring to the lenses of yesteryear: the all metal, silky smooth focus action, engraved symbols, jewel of a lens your father used. The lump 'o new age plastic most of us can afford is loose as a goose. The closest thing to the ideals of yesteryear is the Canon L series (save buying a Lecia).

-- Puppy Face (doggieface@aol.com), March 18, 2002.

Thanks Puppy

Thanks for your reply! I was expecting a reply from you.

Regards

-- John Peter (eosquestions@yahoo.com), March 19, 2002.