[rollei_list] Re: The new Fuji will be sold as.
----- Original Message ----- From: "Eric Goldstein" <egoldste@xxxxxxxxx> 
To: <rollei_list@xxxxxxxxxxxxx>
Sent: Tuesday, September 30, 2008 5:34 PM
Subject: [rollei_list] Re: The new Fuji will be sold as.
An 80/3.5 with 6 in 4 construction (likely a view-camera style Plasmat type) is probably a very highly corrected lens, though some folks 
don't like Fuji lenses on the soft measures...
I believe the APO Lanthars were dialyte-types and not too sure how 
serious we should take that APO designation...


Eric Goldstein

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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. 

--
Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx 
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