Re: Question from a non-lf user.
"Ric Trexell" <rictrexell@vbe . com > wrote in message
news:135e0gooq6ka774@corp.supernews . com ...
>
> "Ric Trexell" <rictrexell@vbe . com > wrote in message
> news:13573tqkkbuc86c@corp.supernews . com ...
>> I have been interested in LF cameras and bought two books
>> on them.
> *******************************************************************
> Thanks again for the information and opinions on the LF
> subject. Thanks
> Mike for the offer of seeing your set up. I'll keep you
> in mind. The issue
> for me is quality and whether my developing and printing
> would come under
> that heading. I think just learning the camera would be
> all I would want to
> tackle begining with LF. I did take a b/w developing
> course while I was in
> the Navy but never did get into color. At some point I
> would no doubt want
> to do some dodging, burning and cropping but not at first.
> Ofcourse I could
> "cheat" and just do that stuff on the computer. I think
> that there are
> several pro photogs or hobbyists around that might develop
> and print my
> shots. I have been tossing around either going LF or
> getting a Mamiya RB67
> but again, that is like comparing apples and oranges.
> Right now the house
> needs a new roof and the car is getting along in miles so
> those will have to
> come first. Thanks again. Ric.
>
No one seems to have addressed the question about
micro/macro work.
Because of the very long bellows draw in comparison to a
35mm camera there is really no limit to how close you can
get. However, there is an inherent property of lenses which
requires them to be optimised for a subject at a fixed
distance. Standard camera lenses are optimised for
essentially infinity. Often standard lenses do not perform
well when used for very close work. A better choice is an
enlarging lens mounted on a shutter. The choice of focal
length will depend on the size of the object you are
photographing. For micro work, that is, where the image is
larger than the object, an enlarging lens turned around
backward will work quite well. The lens should be chosen so
that the magnification is about the same as would be the
case in enlarging. For instance, a 50mm enlarging lens,
intended for 35mm film, will do very well for coin sized
objects on an 8x10 camera but will work well for 4x5 also. A
few years ago there was a flood of "process" lenses on the
market because the cameras they were used on were supplanted
by digital image setters. In particular the Goerz
Apochromatic Artar was available in large numbers. This is a
slow lens intended for same size reproduction but it works
well over a very large range of magnification inluding
infinity focus when stopped down a bit.
In general the sensitivity of a lens to distance is
least for slow lenses and for narrow angle lenses. The
variation of correction with distance depends on the
variation of the angles the light rays in the lens make with
the lens surfaces and these are least as the lens is slower
and narrower angle. This is why high speed 35mm lenses don't
do well for enlarging but slow LF lenses usually will work
satisfactorily.
Enlarging lenses are generally optimised for the range
of magnification the manuacturer thinks it will be most used
at. For 35mm the range is centered around about 10X, for 4x5
around 3X.
As for processing I agree with those who suggest doing
it yourself. For B&W at least its very simple and not much
more difficult for color. Negatives can be developed in
trays or print drums although a proper tank is a
convenience. Loading holders requires a dark place. If you
don't have a darkroom or other place get a "loading bag",
this is a light tight double bag with elastic arm holes.
There are also loading tents made but they are expensive and
a loading bag will work with a little getting used to.
At local pro labs film is often for processing in the
holders, which are returned to the photographer. Otherwise
you can put the unprocessed film in the light tight bags and
boxes the film came in. Talk to the lab first to find out
what their recommendations are. But, again, I recommend
doing it yourself.
--
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Richard Knoppow
Los Angeles, CA, USA
dickburk@ix . net com . com