Mackinaw
Think Different
The element directly behind the aperture blades constantly fogs up on my 50/1.2 too. It's hard to believe that a lens made back in the 1950's would still be outgasing, but I guess so. I've learned to live with it and accept the fact that I'll have to clean this lens about twice a year. Luckily this is an easy job that takes me less than ten minutes to do. A minor hassle, but well worth it considering the images I get with this lens.
Jim Bielecki
Jim Bielecki
jlw
Rangefinder camera pedant
Hmmm, odd. I've owned two examples of this lens (one in the past and one currently) and both have been fog-free. Maybe I'm just lucky.
You guys don't store your lenses in sealed plastic bags between uses, do you? Polyethylene definitely will "exhale" a plasticizer that will collect on lenses as a milky haze. If you use a plastic bag to protect a piece of equipment against dust, leave the bag open at one end.
You guys don't store your lenses in sealed plastic bags between uses, do you? Polyethylene definitely will "exhale" a plasticizer that will collect on lenses as a milky haze. If you use a plastic bag to protect a piece of equipment against dust, leave the bag open at one end.
It might be useful for people to post the Serial Numbers of the lenses that have the fogging problem. Canon may have changed the lubricants/cements or whatever else could be causing the problem. This occurred on the Canon 50mm F1.2 that I had. Most of the haze cleaned off but some lubricant got into the balsam and discolored it. It was oily, and I assumed it was from the focus helical. A lot of the lubricant had built up, some "oozed", and was seeping into the lens module.
Some pictures from the ad, with an attachment wide-open.
http://www.rangefinderforum.com/forums/showthread.php?t=6165&highlight=canon+f1.2
Ealy Nikon AID lenses are notorious for aperture blade problems. The AI lenses that preceded them were fine, and later ones were fine. For about 2 years Nikon "experimented" with some (damned) lubricant that got onto the blades and freezes them. Almost impossible to get rid of it all; paid for a cleaning on a 50mm F1.4 AIS series Nikkor. Within a year the blades froze up again. I use it on my Nikon E3 which uses all lenses wide-open and has a second (internal) aperture mechanism.
Some pictures from the ad, with an attachment wide-open.
http://www.rangefinderforum.com/forums/showthread.php?t=6165&highlight=canon+f1.2
Ealy Nikon AID lenses are notorious for aperture blade problems. The AI lenses that preceded them were fine, and later ones were fine. For about 2 years Nikon "experimented" with some (damned) lubricant that got onto the blades and freezes them. Almost impossible to get rid of it all; paid for a cleaning on a 50mm F1.4 AIS series Nikkor. Within a year the blades froze up again. I use it on my Nikon E3 which uses all lenses wide-open and has a second (internal) aperture mechanism.
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