Archived posting to the Leica Users Group, 1999/05/27
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On 26 May 99, Henning J. Wulff wrote, at least in part:
<snip>
> Speaking of non-parallel surfaces on filters, I've had examples of this
> from all manufacturers and suppliers (Hoya, Tiffen, H&H, Canon, Leica,
> Heliopan, B+W, etc) except Nikon. Maybe I just haven't bought enough Nikon
> filters, but I am up to about 40 from them.
How does one check for surface parallelism? It's difficult for me to
believe that filter surfaces could be so grossly aparallel [sic] as to
be noticeable by the naked eye. Otherwise, some pretty
sophisticated means of measuring is necessary.
- --
Roger
mailto:roger@beamon.org
The older I get,
the better I was.
-- Anonymous. Seen on a tee shirt