Hi Frits,
On Sun, 25 Mar 2001 23:09:13 +0100, Frits J. W�thrich wrote:
> To make sure, I replaced the transparent filter (that is screwed into the
> rear of the lens, not very easy to do) and guess what? I can focus properly
> now. I did look at the filter before mounting it, and it is no lens, no
> magnification. I don't understand why, but it works. Also the focus
> confirmation works now.
A number of lenses that put their filters at the rear require that one
filter always be present ... the optical path was designed with glass
in that spot. I think (at least) one of the Pentax fisheye's is like
this, too. I also think I've seen lenses with rear-mounted filters that
were permanently mounted so that one of them was always in the optical
path.
TTYL, DougF
-
This message is from the Pentax-Discuss Mail List. To unsubscribe,
go to http://www.pdml.net and follow the directions. Don't forget to
visit the Pentax Users' Gallery at http://pug.komkon.org .
