Stiff Focus Ring on SMC-F 50mm f1.7
If nothing is obvious, try assembling dry then working the screw, then lok for a shiny area or material being shed.
Regards Dave
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In part two of our Pentax 50mm lens round up, John Riley covers the emergence of the electronic lens era through to the present day. John provides a 50mm history, explains the K mount variants along with guide to their typical use.
Photograph titled 'The Paris Concert Edition II' by kasperbergholt selected as Pentax User's Photo of the Week.
219 posts
11 years
I have a little problem...
Just got a really MINT copy of a Pentax-F 50mm f1.7
Cosmetically is perfect, the lenses are perfect, no CA at 1.7, rly a good copy.
Auto focus is precise and accurate too.
PROBLEM:
Te focus ring is a bit stiff, especially near infinite. I can hear that the servo motor slows near infinite.
I have another copy of this lens, the focus ring is rly fluid and the servo motor runs faster and without to slow in any point.
I removed the filter ring support, cleaned the old grease (that was dirty, gray) and replaced with a liiittttttllleee bit of LITHIUM grease on the elicoid, but the stiffness do not change at all.
Any advices?
Thanxxxxxxxx
P.S. sry for my english.....