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180mm external finder for Leica?


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I'm using a lovely 135/4.0 Elmar on my M8 and have been seeking an external 180mm finder since that's about what the FOV of 135 on the M8.

 

I'm trying to find a 180mm external finder. Any ideas?

 

TEWE finder... not rare to be found on ebay or specialized shops... I thought to buy one some month ago... before to realize that with 135 on M8 is better to get accustomed, guesing the correct framing that is "halfway" between 90 & RF window

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Here is a link which will calculate the angles of view of lenses http://www.tawbaware.com/maxlyons/calc.htm

 

It should be possible to make a viewfinder frame in a cardboard cutout to correspond to the angles ... and experiment with it at different distances from the eye to give the right angle eg for a 180mm lens :

 

Horizontal 11.4 degrees

Vertical 7.6 degrees

Diagonal 13.7 degrees

 

... ie from either side of the centre of the field :

 

H 5.7 degrees

V 3.8 degrees

D 6.85 degrees

 

dunk

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