On Thu, Aug 25, 2005 at 10:15:34AM +0100, Chris Stoddart wrote:
> On Wed, 24 Aug 2005, Steve Jolly wrote:
> > If you examine the filters carefully, you can see that they're slightly
> > concave lenses rather than plain glass. (This is most obvious if you
> > look at the reflection of a light source in them - you can see two
> > images, one bigger than the other). I found the lens very soft (on
> > film, at least), and have been wondering whether the filters are in fact
> > an important part of the lens's optics.
> Steve, I don't think so. The filter being necessary is apparently not
> mentioned in the manual, plus it's not on the optical diagram in the
> manual. I've not done a proper test yet (I will, I will, I promise) so
> I can't be certain, but most of the evidence points away. Also I can't
> see any concavity/convexity on the filters and they don't seem to alter
> the image when you look through them...
One more thing, I just tried this 20mm on my K1000, and it doesn't have
mirror lockup problems there.
Good old legend! :)
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