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Same lens formula?


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  • 3 months later...

Here there are.

 

The 3 parts have the same serial number.

 

 

Yes.

 

I have a Summicron lens group that I bought together with both mounts (rigid + DR) and the same serial number on each of the three parts.

 

A special order I presume. 

 

 

Here is the picture.

 

 

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Very tasty item... thanks for the post : just a curios that isn't clear from the pictures: how is the focusing knurled ring of the non-DR Mount ? I mean... the ring of the DR is notoriously thinner than the one of the rigid Mount... but I can't see it clearly, and, being this one, as you say, probably a special order item, I am curios to see if the fixed mount is really a standard one...

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Another pic

 

Very tasty item... thanks for the post : just a curios that isn't clear from the pictures: how is the focusing knurled ring of the non-DR Mount ? I mean... the ring of the DR is notoriously thinner than the one of the rigid Mount... but I can't see it clearly, and, being this one, as you say, probably a special order item, I am curios to see if the fixed mount is really a standard one...

 

Here another picture :

 

 

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Another

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And finally

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Thanks ! Ok... my doubt has been cleared... :) indeed, standard focus ring for the 1st Summicron rigid (to say, single distance scale and front writings in italic) : I don't remember to have ever seen a Summicron with 2 matching mounts.... I remember to have read somewhere that Leitz sold BM rigid mounts for the owners of the SM version (and, probably, they were matched with the s/n of the original lens) , but this is another kind of service...I wonder which was the original version... by logic, it could had been a customer that bought a normal Summicron and then asked to have the DR Mount... can't see reason for one would had wanted to add a normal Mount to his own DR... :huh:

Edited by luigi bertolotti
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Yes... and it's normal, but it is a further detail which confirms the hipotesis that the lens was originally born as a normal Summicron 50 : the DR are 50mm straight and do not bear the detailed exact focal length : the DR Mount, as speculated, was added to order after, and "tuned" to that focal, which makes it a really rare item.

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Hello Everybody,

 

I think that the 50mm Dual Range Summicron lens element units were all chosen from the SAME actual focal length of production in order to lessen the need for final adjustments during final assembly. I don't think that measurement was actually 50.0mm.

 

I think that the Rigid equivalent was produced with lens element groups which were at least 3 different actual measured focal lengths as opposed to the theoretical 50mm engraving on the front rim. One of those measurements was the same as the measurement that was used for the Dual Range.

 

Best Regards,

 

Michael

Edited by Michael Geschlecht
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Hello Everybody,

 

I think that the 50mm Dual Range Summicron lens element units were all chosen from the SAME actual focal length of production in order to lessen the need for final adjustments during final assembly. I don't think that measurement was actually 50.0mm.

 

I think that the Rigid equivalent was produced with lens element groups which were at least 3 different actual measured focal lengths as opposed to the theoretical 50mm engraving on the front rim. One of those measurements was the same as the measurement that was used for the Dual Range.

 

Best Regards,

 

Michael

You are right.... I did not remember well the issue of the real FL of DR... indeed, my Summicron DR has clearly hand engraved "51,9" onto the lens cell... and this is one of the 3 focal lengths of the std. Summicron Rigid (51,6 51,9 52,2).

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DR lenses were all the same 51.8 approximately mm focal and the mounts were made for that exact nominal focal length.    Rigids were any focal length within tolerance and sold with matching mounts.   I suppose some rigids  could have been 51.8 and sold with both mounts.

 

Yours is the version one.   There was a second version with satin chrome and different optics.   If you look at both together,  the front element curve is very different. DR and Rigids also came in the update and the eyes are different and not interchangeable.  I never shot with the "heavy chrome" version. 

 

Interesting find if real.  What is a bit unusual is the the inner mounts are usually hand scribed with last 4 digits of serial.  Yours is machine  marked.  At the end of the focus scale, the exact focal the mount is made for is engraved 90 degrees off using the last two digits.   If the numbers do not match,  it was a custom job or just a fraud.

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