Focusing Helicals

I've been slowly building a 6x17, and am having problems tracking down
suitable focusing helicals for my lenses, primarily I want to use my Nikkor
90 F4.5, Rodenstock 150 Sironar W 5.6 and Schneider Xenar 300 F5.6. All of
them are fairly large lenses so I need focusing helicals large enough to
accomodate the rear lens elements. Does anyone have any tips on what might
be sutable

Thanks

Glenn

Please reply to as I've had to change my rely to
address to cut down the spam influx

In article ,
"Glenn Barry" wrote:

I've been slowly building a 6x17, and am having problems tracking down
suitable focusing helicals for my lenses, primarily I want to use my Nikkor
90 F4.5, Rodenstock 150 Sironar W 5.6 and Schneider Xenar 300 F5.6. All of
them are fairly large lenses so I need focusing helicals large enough to
accomodate the rear lens elements. Does anyone have any tips on what might
be sutable

Thanks

Glenn

Please reply to as I've had to change my rely to
address to cut down the spam influx



Rodenstock makes focusing helicals with calibrated focusing scales and
DOF scales for all of their lenses from 35 to 150mm in 0 shutters.They
do not make any for their lenses in 1 shutter. If you were to use the
90mm 6.8 and the 150mm Apo Sironar S you could easily find helicoids.

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"Glenn Barry" wrote in message
u...
I've been slowly building a 6x17, and am having problems tracking down
suitable focusing helicals for my lenses, primarily I want to use my
Nikkor
90 F4.5, Rodenstock 150 Sironar W 5.6 and Schneider Xenar 300 F5.6. All of
them are fairly large lenses so I need focusing helicals large enough to
accomodate the rear lens elements. Does anyone have any tips on what might
be sutable

what about this one: http://www.skgrimes.com/thisweek/1_5/index.htm

Guillermo