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Summitar - 10 aperture blades, years


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I've searched with no luck to find what years (or serial number range) the Summitar had 10 aperture blades (round compared to 6 hexagon shape).

 

I'm looking for one with 10 blades made in 1949 or later.

 

Thank you in advance.

 

According to Laney and Van Hasbroek, the Summitar with six blades (and hexagonal iris) entered in 1951: so an item of 1949-50 should have the old blades which form a round iris.

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  • 4 months later...

Excuse me for re-opening an old thread, but this info seems relevant to the discussion . . .

 

My Summitar --serial number 81211x--has 10 blades. I notice that the Summitar entry in the LeicaWiki states:

 

"Diaphragm setting /type - 10-blade / 6-blade after s/n 810001"

 

Perhaps there was some overlap during the transition from 10 blades to 6 blades? Number 810001 may have been the first to have 6 blades, but at least one Summitar with 10 blades was produced at a later time.

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The batch of Summitars starting with s/n 810.001 was a very big one : 10.000 lenses !!! No strange that they made some with the old diaphragm... probably many semifinished parts, or replacements, were available in the factory.

 

And... Welcome to the Forum !!! If you'll continue to partecipate into this community, you will realize that "in the Leica world, exceptions are the rule"...

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Excuse me for re-opening an old thread, but this info seems relevant to the discussion . . .

 

My Summitar --serial number 81211x--has 10 blades. I notice that the Summitar entry in the LeicaWiki states:

 

"Diaphragm setting /type - 10-blade / 6-blade after s/n 810001"

 

Perhaps there was some overlap during the transition from 10 blades to 6 blades? Number 810001 may have been the first to have 6 blades, but at least one Summitar with 10 blades was produced at a later time.

 

I have one from 1949 (round blades) 682 4xx

and one from 1950 (flat blades) 799 1xx

 

on my web site : IIIb page

Edited by jc_braconi
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  • 2 weeks later...
The batch of Summitars starting with s/n 810.001 was a very big one : 10.000 lenses !!! No strange that they made some with the old diaphragm... probably many semifinished parts, or replacements, were available in the factory.

 

Yes, that's what I thought also--someone found an old bin full of 10-blade kits under a workbench--or something like that.

 

And... Welcome to the Forum !!! If you'll continue to partecipate into this community, you will realize that "in the Leica world, exceptions are the rule"...

 

Thank you for the welcome. I've been visiting here now and then for the last 18 months--since buying a IIIG and Summitar. You are all a great source of information.

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  • 5 years later...
  • 4 years later...
On 12/8/2010 at 12:38 PM, luigi bertolotti said:

 

According to Laney and Van Hasbroek, the Summitar with six blades (and hexagonal iris) entered in 1951: so an item of 1949-50 should have the old blades which form a round iris.

My Summitar is from 1950 and it has 6 blades only.

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