Re: UV photography with Nikkon Enlarging lenses

["Willem-Jan Markerink" <w.j.markerink@xxxxx>]

On  8 Mar 99 at 9:45, Rolland Elliott wrote:

> My only problem now is to figgure away to mount these enlarging lenses
> on my Nikon N90s camera.  I need some kind of adapter that goes from
> the Nikon F-mount to a 39mm thread that is deep enough to allow me to
> turn the lens in and out of the mount for focusing purposes.

First, my compliments on this nice discovery; well done Sherlock....:-))

Second: are you sure that your current lenses are unsuitable for
near-UV use, just below 400nm? I believe I have seen more than one
reference claiming that it is far-UV (closer to 300nm) which causes
big problems with non-UV corrected and multicoated lenses. I think we
have a handful other members on this list who have done extensive UV
experiments, in particular a Norwegian member I believe....also one
of the links on my homepage.

Third, M39 is by far the most universal mount on this
planet....simply because adapters exist in nearly every odd mount,
including old German mounts you and I wouldn't even recognize, *and*
in both directions. There is no other mount that combines these two
aspects so perfectly. Of course, part of the reason is it's German
roots, the old Leica range finder system....add a German adapter
manufacturer, Novoflex, and you can arrange the most silly
constellations of adaptions, simply because you can do so through an
universal mount inbetween. For example from Nikon-lens to M39 and from M39
to Canon FD body....the sky is the limit. With of course a big 'but': you
most likely loose infinity focusing with all (35mm!) photo lenses, as
well as with all non-tele enlarger lenses (less than 75mm or so is my
rough guess)....but for macro use this is all you need.

So, this leads to the famous 'last but not least' question for
non-bellows use: what focal length are we talking about
here?....what is the focal range of these EL lenses?

I'll start creating yet one more chapter on my homepage....the amount 
of UV-chapters is sadly low thusfar....:-))

[if you still don't believe in coincidence: last sunday I found a
Kodak 18a filter on a second hand photo market....;-))....never ever
seen one before in all the years that I have visited second hand
photo shows....and in this case I was triggered by seeing Guenter
Wagner's book about IR-photography, after which an old 52mm B+W
infrared #89B was digged up (chrome, and no type indication on the
mount)....and my 'do you have any more exotic stuff with you?' was
met with this 18a filter....I already had two homebrew Scott UG1/UG3
filters, but this Kodak 75x75mm also allows flash use....cool....]




--                 
Bye,

Willem-Jan Markerink


      The desire to understand 
is sometimes far less intelligent than
     the inability to understand


<w.j.markerink@xxxxx>
[note: 'a-one' & 'en-el'!]
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