my 24-85 lens has some circular spots in the lens assembly itself on the lens surface, which i highly suspect to be early growth of fungus. because of this - i just booked for one digicabi db-66 60L dry cabinet from mscolor for 190 just about 1 hour ago. my lens...

1. question is, should this suspected lens be sent directly to canon sg for servicing, or can i proceed to put it together with another new canon 50mm f/1.8 lens in the same dry cabinet?

2. where to get a reliable, calibrated hygrometer?

3. roughly how much would a repair of the lens cost?

thanks for any information...