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brianv · 04/05/08, 10:20 AM

Oil from the helical has seeped into the aperture mechanism and got on the blades. usually, it is not a major problem and just dampens the movement of the blades. It can gum up the motion.

On some lenses where the surfaces are very close to the blades, It can get onto the elements and "smudge" them. It can evaporate and leave a haze, and at worst damage the coatings and etch the coatings and glass. That is an extreme, but I've seen it happen on Canon LTM lenses.

Usually, 99% of the time, the oil can be reduced with a CLA and any haze on the glass cleaned off.

04/05/08, 10:20 AM	#2 (permalink)
brianv Erfahrener Benutzer Join Date: 03/31/06 Posts: 165	Re: Oil on the shutterblades Oil from the helical has seeped into the aperture mechanism and got on the blades. usually, it is not a major problem and just dampens the movement of the blades. It can gum up the motion. On some lenses where the surfaces are very close to the blades, It can get onto the elements and "smudge" them. It can evaporate and leave a haze, and at worst damage the coatings and etch the coatings and glass. That is an extreme, but I've seen it happen on Canon LTM lenses. Usually, 99% of the time, the oil can be reduced with a CLA and any haze on the glass cleaned off.