Just a short question. How do we protect our lens from catching a fungus or anything that would affect the quality of picture?Any advice please. Does a sudden changed in temperature will produce a condensation inside the lens? say from 18 deg inside the office,and 30 deg outside? I normally see a condensation on my officemate reading glasses when they get out of airconditioned environment to a hot weather outside. Does this happens as well on the lens? I hope anyone can help me on this. Many thanks
A German photography magazine wrote it is almost too late when you can see fungus on your front element surface. I can't remember what they said how to clean it. But if you try it only a special cleaning fluid for photographic gear should be used. And you have to be very careful not to damage the multicoating.
Differences in temperature shouldn't be a problem when you wait long enough before you take your camera out of your bag. Otherwise it could happen you see fog looking through the viewfinder. Changing lenses after a quick change of temperature can bring condensing water into the body because hot (or cold) air gets into it when you remove the lens.
To guarantee that fungus will never grow on a lens...no. To do all you can do to prevent it...yes. When not actively using my lenses, I keep them in a Pelican airtight case with some silica packets to remove any moisture from the air. (Be careful not to use too many packets since they can also remove any moisture content in the lubrication inside the lens.) Keeping them under a low humidity environment will also help such as an air conditioned closet. However, when I'm using the lenses they tend to be used in high humidity conditions where fungus could grow. So it is impossible to completey remove them from any type of climate where fungus cannot grown. Subjecting the lens to direct sunlight will also kill any possible fungus since UV tends to kill fungus. Good luck DD