I never wipe a dry optical surface. After blowing off whatever is loose
I use multiple cotton swabs which are fairly well saturated with alcohol
or Windex to gently loosen and pick up the fine grit. The particles may
look like flour but on a microscopic/optical scale they're rough
boulders. Just don't use so much liquid that it starts flowing into the
lens cell.
Chuck Norcutt
Wayne Culberson wrote:
> A few years ago we were on the Altiplano of Bolivia during one of the driest
> parts of the year. They were constructing a new road across the plain from
> Oruro toward the Chilean border. The dust was just unreal, especially during
> several hours of driving through this construction and another days drive
> across the Altiplano on dirt trails. At the time I was using a Vivitar 28-80
> zoom lens on an OM, with a UV filter for protection. I thought I was being
> very careful in blowing off the dust, and gently huffing and wiping dust off
> the filter, an exercise that had to be done several times a day. After about
> 3 days of this, with careful inspection, I noticed the damage. The filter
> was ruined. If not for the filter, it would have been the front element.
>
> This is only filter I've ruined that way. I've ruined another one on an
> Olympus RC; cracked it.... another story. Sometimes a protection filter is
> needed. Most of the time, I never use one.
>
> Wayne
>
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