I'm really confused now!

[sparkie]

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i tried mounting 2 of mr DR's on my M8. No luck. Wouldn't even mount at the 1M setting Yipes, I hope I ain't damaged anything

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[jaapv]

Are you aware that all the DR's are actually more than 50mm? I'm told that most are around 52mm, and some 53mm. It may be that this tiny discrepancy is the major decider as to whether the lens can focus at infinity??

 

This is not a discrepancy, nearly all Leica 50 mm lenses are about 52 mm. This dates back to the very first designs by Barnack and Berek. There is a lot of myth about this choice, for instance that this corresponds to the angle of view of the human eye (which is not true), but I feel the truth of the matter is that that happened to be where the chips fell when the first lenses were calculated.

[carstenw]

Camerquest for one. Try shining a light through it at a angle and look through it from the other end. That will show what is really in the lens, dust and such on the glass.

The first two I looked at had bad haze, visible to the naked eye. The last one only showed the haze when shiniing a light through it. I contacted the person I bought it from and sent him picture of it. He took it back as it was listed as clean.

I know what you mean with haze, and before making my post, I did double-check with a super-bright LED light I recently bought for checking out lenses, but what I saw in the DR was close to what I see in my as-new 50 Lux Asph, ie. little dust particles that you can't see any other way, and nothing much more. I do have an Elmarit-R 180/2.8 that has haze, so I know what it looks like. I also have something in my 35/3.5 Elmar from '39, but expect it in such a lens. It surprises me that the DR is meant to have more. I have never heard this.