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FS: 210/370 Symmar cells (no shutter)



 
 
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  #1  
Old October 19th 04, 02:10 PM
Collin Brendemuehl
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Default FS: 210/370 Symmar cells (no shutter)

I have a set of Symmar Convertible cells for sale.
They came with a shuter that I needed, but the cells are not needed.
As a result, the set is for sale.
Glass is clean and clear.
Only a few minor cleaning wisps. Nothing major.
Get a shutter & screw them in & go shooting!

$100 + shpg.
PayPal preferred.

Collin
  #2  
Old October 19th 04, 05:15 PM
Bob G
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Default

I have a set of Symmar Convertible cells for sale.
They came with a shuter that I needed, but the cells are not needed.
As a result, the set is for sale.
Glass is clean and clear.
Only a few minor cleaning wisps. Nothing major.
Get a shutter & screw them in & go shooting!


Pretty simple, but how are you going to calibrate the new shutter for f-stops?
I would mark 5.6 at the point where the shutter blades just disappear from
view.
Then, with a set of precise calipers, I would measure the diameter of the
circle the blades form as best I could.
Then I would take that measure and divide by the square root of two and close
the blades down until the diameter reached the new measure. That I would mark
f8.
One could then continue the process, even though the smaller the diameter gets
the greater room for error. Or one could then measure the length of the segment
formed between the two f-marks already obtained on the shutter's aperture plate
and continue marking by dividing by the square root of two.
Or one could mount the lens on a camera and measure the light thrown on the
groundglass from an evenly lighted object (a white wall?) with a precision spot
meter.
Any such method is very likely to lead to large errors at the smaller
apertures.

Another problem with re-mounting a lens is cell spacing. Slight differences may
make large differences in lens performance. For best results you need a
collimator and some expertise.

On the other hand, if one's lucky, one may wind up with a great lens!

Bob G
 




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