[rollei_list] Re: The new Fuji will be sold as.
- From: Don Williams <dwilli10@xxxxxxx>
- To: rollei_list@xxxxxxxxxxxxx
- Date: Tue, 30 Sep 2008 20:59:05 -0500
At 07:48 PM 9/30/2008, Richard wrote:
The Apo Lanthar is a Heliar type. The older plain Lanthar is a
triplet. I also don't know if the Apo Lanthar was a true apochromat.
I don't know of any roll film cameras with Plasmat type lenses.
Their main virtue is wide field coverage and the ability to be very
well corrected for astigmatism but the Planar/Opic/Biotar type
probably has less spherical aberration which is important in
cameras using rangefinders because it minimises the shift in the
point of apparent best focus as the f/stop is changed. Excellent
lenses have been made using all three designs but the Planar and
Plasmat seem to be the favorites among lens designers.
Comparatively few lenses have been based on the Heliar.
Now that the film thread has become a lens thread, and the issue of
apochromat lenses has been introduced, I have a question for anyone
who may know.
Once in my career I had, in my department, a process camera. We used
it to make a form of integrated circuit and the film was always
red-blind as I recall, just very high contrast. The camera was so
large it had a room of it's own, which was more or less part of the camera.
After all of that, the question. The lens performance was
incredible, just superb, but was it an apochromat or just designed
for a narrow color band?
DAW
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