Archived posting to the Leica Users Group, 1998/01/31

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Subject: Re: [Leica] The 0.85: strange new need
From: Erwin Puts <imxputs@knoware.nl>
Date: Sat, 31 Jan 1998 18:10:57 +0100
 
Focal length    Max aperture    Max aperture 		Max aperture
                M3              M2, M4, M5, M6		M6HM, M6J

21mm		0.12            0.15			0,13
24mm		0.15		0,19			0,16
28 mm           0.21            0.26			0,22
35 mm           0.33            0.41			0,35
50 mm           0.67            0.84			0,71
75 mm           1.5             1.88			1,59
90 mm           2.17            2.71			2,29
135 mm          4.88            6.1			5,16


Computations based upon
physical baselength = 69,25
effective baselength:
M3=0,9
M2 etc = 0,72
M6J and M6HM = 0,85 (0,86 is also mentioned)
I noted in an earlier post that ALL M types share the same physical length
of 69,25. Many persons give different figures for the physical baselength
of several M models (68,5 etc). These figures are not correct.
Erwin