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 - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't forget to visit the Pentax Users' Gallery at http://pug.komkon.org .
