I suspect the focusing drag is adjusted by the weight of grease used. Fargo
Enterprises lists a kit with multiple grades of Nye grease for adjusting the
feel.
Giles
Chuck Norcutt wrote:
> the Vivitar in years. The focusing collar is too loose and the
> slightest touch will knock it out of focus. By the way, is there an
> easy way to fix this? Are the tolerances off? Is there not enough
> grease in the the focusing threads? Is there a drag adjustment?
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