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A Garden stroll with the Industar 22, 50mm f3.5 LTM
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PostPosted: Thu Apr 30, 2020 11:50 am    Post subject: Reply with quote
tb_a wrote:
Sciolist wrote:
The prototype was ready in 1923. As you can imagine, there would be a development time. Leica fan, Thorsten Von Overgaard believes Berek started after the war ended.


Well, that would be an explaination of the storyline to design a "new" lens with the Cooke Triplet myth as the Tessar was protected until 1922.



What myth is this tb_a. Could you expand?


PostPosted: Thu Apr 30, 2020 12:07 pm    Post subject: Reply with quote
Sciolist wrote:
tb_a wrote:
Sciolist wrote:
The prototype was ready in 1923. As you can imagine, there would be a development time. Leica fan, Thorsten Von Overgaard believes Berek started after the war ended.


Well, that would be an explaination of the storyline to design a "new" lens with the Cooke Triplet myth as the Tessar was protected until 1922.



What myth is this tb_a. Could you expand?


That's my assumption unless there is any proof. Unfortunately we can't ask Mr. Berek. Wink


PostPosted: Thu Apr 30, 2020 12:56 pm    Post subject: Reply with quote
tb_a wrote:
Sciolist wrote:
tb_a wrote:
Sciolist wrote:
The prototype was ready in 1923. As you can imagine, there would be a development time. Leica fan, Thorsten Von Overgaard believes Berek started after the war ended.


Well, that would be an explaination of the storyline to design a "new" lens with the Cooke Triplet myth as the Tessar was protected until 1922.



What myth is this tb_a. Could you expand?


That's my assumption unless there is any proof. Unfortunately we can't ask Mr. Berek. Wink



I'm lost here, tb_a. Are you saying that it's a myth that the Elmar was based on the Cooke Triplet? I'd agree. I've said Berek developed the Elmar from the Elmax. Why would you need to ask Mr Berek personally about it?

Do you understand what a 'Straw Man' argument is tb_a? You seem to read things in my posts that are not there. It is making it difficult to discuss.


PostPosted: Thu Apr 30, 2020 2:17 pm    Post subject: Reply with quote
Maybe I've misunderstood something here and expressed myself somehow unclear for you. My fault. My English is still not perfect.
Sorry for that.


PostPosted: Thu Apr 30, 2020 8:28 pm    Post subject: Reply with quote
tb_a wrote:
Maybe I've misunderstood something here and expressed myself somehow unclear for you. My fault. My English is still not perfect.
Sorry for that.


Mine's not perfect either. No problem tb_a.


PostPosted: Fri May 01, 2020 6:52 am    Post subject: Reply with quote
Sciolist wrote:


The discussion isn't whether the Elmar is a Tessar design tb_a, but whether the Industar an Elmar copy. That is what I've discussed.



"With the original Leitz Elmar 3.5 / 50 lens, the diaphragm was located between the first and second components.
M.D. Maltsev: “In 1944, the Krasnogorsk Mechanical Plant (KMZ) proceeded to manufacture a photoelectric photomultiplier camera with an I22 lens: f ′ = 51.39; 1: 3.5; 2ω = 45 °. With the increase in production volume, the need to increase the thicknesses of the second d2 = 0.90 and the third d3 = 0.80 lenses with a diameter of 14 mm became apparent, since the surface quality remained low (the ratio of thicknesses to lens diameters is too small: d2 / D2 = 1 / 16 and d3 / D3 = 1 / 18. Such a lens upgrade was made (I22m) and the thicknesses were increased to 1.05 and 1.20, respectively, while the tolerances on the thickness were increased to ± 0.1 mm instead of 0.03, subject to completion lenses by the thickness developed by the author at that time, which improved image quality and simplified production: aberrats They were saved, for which it was necessary to change the thickness of all the lenses, the first air gap and two radii of curvature, with Δd = ± 0.1 the lenses can be manufactured in a rigid way. ”

http://www.zenitcamera.com/archive/lenses/industar-22.html#n1


PostPosted: Fri May 01, 2020 7:14 am    Post subject: Reply with quote
Thank you Kamerer.
As Zenit is referring to the Elmar and not to a Tessar, the I22 is most probably an Elmar copy. Wink


PostPosted: Sat May 02, 2020 4:42 am    Post subject: Reply with quote
Some more from my garden today with this lovely lens.
Tom

#1


#2


a crop from above:


#3


And because the lens is so easy to flare, why not use that creatively Smile


#4


PostPosted: Sun May 03, 2020 9:05 am    Post subject: Reply with quote
Oldhand wrote:
Some more from my garden today with this lovely lens.
Tom
And because the lens is so easy to flare, why not use that creatively Smile

#4


Thank you for this inspiration Smile

Flare is a feature I have always strived to avoid ... maybe I should reconsider!
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