I think lenses should be serviced when the following shows up:
Uncomfortable amount of specks inside.
sluggish diaphragm blades.
oily, shiney spots on blades
any obvious tightness, dents or defects on outer parts.
lens doesn't focus at infinity on the horizon (some zooms and telephotos have
variable infinity's).
John
Mike Grove wrote:
> Is there a good rule of thumb for getting your lenses serviced? I'm not a
> professional like a lot of the folks here, and I'm wondering if the
> maintenance schedule should be based on the amount of aperture trips or
> number of years between servicing. In other words a sports photographer who
> shoots a dozen rolls every other day would have to get service far more
> often than someone who shoots 2 rolls a week walking in the woods.
>
> Mike
>
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