Brian,
I cranked the lens out and looked inside. I can see the helicoil but no
grease on mine...maybe a little bit on one of the groves at the very back.
I stuck my finger in and touched the helicoil. It came out dry, no grease.
I have had the lubricant in a 28mm smear the lens when I left it in a hot car
(never a good idea). Otherwise, I can't imagine what good purpose that
grease is serving. What does the local repairman say?
Regards, Bob S.
[EMAIL PROTECTED] writes:
<< I just received an A 50mm f/2.8 Macro lens "in pristine, like new
condition", according the eBay seller. I have a question regarding the
proper extent of lubrication for the focusing helicoid.
The lens arrived in something less than the advertised condition, with a
light grease smeared on the rear element. I've never used a macro lens
before, and the ability to peek inside and see the helicoid lubrication
raised a question: What's it _supposed_ to look like in there? How much
grease should there be on the helicoid? Does it evaporate to coat the
glass surfaces over the years, or does the condition of the rear element
suggest that the "pristine, like new" lens was given (too large) a
dollop of grease just before I purchased it?
Thanks for any input.
Brian Walsh >>
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