----- Original Message -----
From: "Robert Meier" <robertmeier@xxxxxxxxx>
To: <rollei_list@xxxxxxxxxxxxx>
Sent: Thursday, October 02, 2008 8:07 AM
Subject: [rollei_list] Re: [off-topic] The new Fuji will be sold ... and
affordable ?
I've bought three Super Ikonta IV's in the last few years, because I had
one as a teenager, my first serious camera, and had great results from it
(still have the negatives I shot then). I have bought three in resent
years because each one was not sharp. I finally sent one to to
whats-his-name on Bald Mountain to be alligned, and it came back still
not critically sharp. The standard I use is to make an 8x10 print and
look at it with a 4x magnifier. Rollei shots are very crisp at that
degree of enlargement. The Super Ikonta shots are all much less than
crisp. I gave up on Super Ikontas.
Likely you are seeing the effect of the lens being a front element
focusing type. Unless a lens is made fairly complex moving one element
only will upset all the corrections. Front element focusing lenses are
designed to have reasonable correction through their range but are never
quite right at any distance. On top of that f/2.8 is right at the limit of
speed for a Tessar type and generally such lenses suffer in comparison to
slower versions even when stopped down. Tessars expected to have very high
performance are usually much slower as, for example, the Kodak Commercial
Ektar (f/6.3) and the Nikon LF lenses at about f/8. The difficulty in
getting acceptable performance near wide open for an f/2.8 Tessar is
probably why Rollei went to another design for its f/2.8 cameras.
--
Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx
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