[rollei_list] Re: Back-Focus and Retro-Focus
- From: Marc James Small <marcsmall@xxxxxxxxxxx>
- To: rollei_list@xxxxxxxxxxxxx
- Date: Mon, 07 Jul 2008 16:03:01 -0400
At 03:49 PM 7/7/2008, Carlos Manuel Freaza wrote:
>
>Marc, the discussion was if the 2.8B Biometar was closer to the Planar
>or to the Xenotar, and there is not doubt it's closer to the Xenotar
>as Todd Belcher verified disassembling one of his 2.8B Biometar lens,
>it does not mean it's identical regarding the Pentacon Six Biometar
>but both Biometars are very similar regarding lens elements
>distribution, number of elements/groups and general design.-
Absolutely, Carlos, precisely as the original
5-element Hasselblad 2.8/80 CZ Planar is clearly
related to but not identical to the lens used on
the 2.8C and later Rolleiflex TLR's. Sauer has
told us of the steps taken to "mega-size" the
Rolleiflex lens for the Hasseblad.
But, in any event, retrofocus designs are not necessary for normal lenses.
Marc
msmall@xxxxxxxxxxxx
Cha robh bàs fir gun ghràs fir!
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