[rollei_list] Re: xenar test roll is back
- From: daxelb@xxxxxxx
- To: rollei_list@xxxxxxxxxxxxx
- Date: Thu, 04 Feb 2010 20:01:18 -0500
Hey Richard,
I defer to your (far) greater knowledge and I'd thought the same thing-- my
lens is old and may not be as clean as it should be--but I've printed with two
other lenses ( also old) that pretty much correspond with contrast of my lens.
I'll certainly use your recommended flash light method and lord knows I've had
that lens for over twenty-five years and I don't doubt that I will find the
evidence you describe but I have used my friend's lens on old negs and gotten
superior results-- not sharper just more contrasty than I was ever able to
effect originally. I think, but wouldn't argue, that it is just an inherently
more contrasty lens.
Have your heard of this before? I guess my question is: are there variations
among same (new) lenses? Or is consistency the non-hobgoblin of little lenses?
David
-----Original Message-----
From: Richard Knoppow <dickburk@xxxxxxxxxxxxx>
To: rollei_list@xxxxxxxxxxxxx
Sent: Thu, Feb 4, 2010 3:39 pm
Subject: [rollei_list] Re: xenar test roll is back
----- Original Message ----- From: <daxelb@xxxxxxx>
To: <rollei_list@xxxxxxxxxxxxx>
Sent: Thursday, February 04, 2010 10:39 AM
Subject: [rollei_list] Re: xenar test roll is back
Hi,
Another rub: what about the possible variations among (supposedly) exact same
lenses? Has anybody found that to exist to a point where it is apparent?
I had that experience with a Nikkor 50mm enlarging lens. A friend of mine has
the same lens and it gets a full grade of improved contrast over my own. I
occasionally borrow her lens when I have a really flat negative and I can get a
beautiful print from a #4 filter where with my own lens the image would print
too flat.
David Baumbach
There should not be so much difference in contrast. I suggest checking both
lenses for internal haze. Just shine a small flashlight through the lens, if
there is any haze you will see it. Even a very small amount of haze will
substantially reduce contrast. Most lenses are reasonably easy to get apart for
cleaning. The haze forms on inside surfaces. I don't know the cause for certain
but suspect it is a deposit from the anti-reflective paint in the lens cell. It
forms inside sealed cells so I don't think its from evaporated lubricant.
Whatever it is seems to come off with ordinary lens cleaner or alcohol.
Its very unlikely that the difference in these two lenses is caused by a
variation in optical correction or even by differences in coating. It _is_
possible that its caused by scratches or "cleaning marks" which are very fine
scratches, in the surface of one lens. These can also destroy contrast. The
flashnight examination will also show them up pronto.
--
Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx
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