[rollei_list] Re: Macro with Enlarging Lenses on the SL66?
- From: "John Wild" <JWild@xxxxxxxxxxxxxxxxxxxxxx>
- To: <rollei_list@xxxxxxxxxxxxx>
- Date: Mon, 11 Sep 2006 08:47:55 +0100
Marc,
Thanks for that.
I did see a 100mm Luminar on Ebay a year or so ago; I could not justify
spending the money on it but although I can't remember how much it went
for, my impression was that it was not excessive.
John
-----Original Message-----
From: rollei_list-bounce@xxxxxxxxxxxxx
[mailto:rollei_list-bounce@xxxxxxxxxxxxx] On Behalf Of Marc James Small
Sent: 10 September 2006 07:01
To: rollei_list@xxxxxxxxxxxxx; rollei_list@xxxxxxxxxxxxx
Cc: Willem-Jan Markerink; charzov@xxxxxxxxxxx
Subject: [rollei_list] Re: Macro with Enlarging Lenses on the SL66?
At 04:12 PM 9/9/2006, John Wild wrote:
>Rollei made adapters that fitted into the bayonet lens mount of the
>SL66. One had a small pilot hole that could be bored out to take a
>large format lens in shutter or anything else that could be fitted; one
>was machined to take M35x.75 100mm Luminar; one was machined M39x1 for
>the M-Componons & enlarging lenses; one was for Luminar and other
>microscope lenses.
This is interesting stuff, John. Zeiss Ikon only sold a single set of
adapters for the 100mm Luminar and that was only for the Contarex. The
SL66 adapter would be worth it just for the 100mm Luminar mount!
M-Componons are NOT in M39x1 -- that tragic mistake was also made by
FED, Prewar, and Canon, Postwar. The proper dimensions of true LTM are
39mm by 26 turns-per-inch Whitworth. Why Whitworth? As Whitworth was
the standard thread for microscopes, even those made in Germany, and so
Oskar Barnack had lots of gear capable of cutting Whitworth threads and
lots of technicians able to work in Whitworth when he designed the
original LTM, so Bob's your uncle. Every attempt to mangle this into
39mm by 1mm DIN has led to dismal failures.
The third mount you mention was the standardized thread for microscope
objectives adopted in the 1860's by the Royal Microscope
Society: this is generally known in the trade as the " Royal Screw"
but folks often fail to get the humor in the term. The proper
dimensions for this are 0.8" by 36 turns-per-inch, again in Whitworth.
(Whitworth, incidentally, was the only thread design developed without
regard for production cost: it is simply the best in terms of
durability, reliability, and retention, but it has been superseded by
lesser designs such as SAE and DIN which are considerably cheaper to
produce.) Most macro lenses are in Royal Screw, be they Leitz Photars
or Zeiss Luminars or Carl Zeiss Jena Mikrotars. These lenses always
yield MF coverage (I am willing to be convinced to the contrary, but I
believe this to be true) and many yield coverage on larger cut-film
sizes. Linhof for years sold Royal Screw adapters for their cut-film
cameras. I do not own an SL66, though I undoubtedly should do so. I do
own a Hasselblad 2000FC/M, though, and have a Royal Screw adapter,
thanks to Charlie Barringer, which allows me to make MF slides of the
esoterica of lens markings and the like. There is nothing which quite
makes the point as emphatically as does a MF slide of, say, a cross-bar
T marking on a Carl Zeiss lens. Depth of field? We don't need no
stinkin' DOF: just focus VERY carefully!
Probably the most accessible scholar of macro lenses is Willem-Jan
Markerink. His web site
http://www.a1.nl/phomepag/markerink/microlen.htm
is highly recommended. Willem-Jan and I have sparred occasionally over
varying values for optical registration on various camera mounts but his
work on macro lenses is nonpareil and most highly recommended.
Marc
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