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Leica Screw Mount Copies Classic Leica Copy forum as listed in the book 300 Leica Copies, including but not limited to Nicca, Leotax, Honor, Canon etc. At one time there was a major part of the camera industry just trying to make a lower cost copy/dirivitive of the original Leica.

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Old 04-28-2011   #26
Green_Blue
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does anyone know much about the leotax leonon 50/2? Is it just the same optical formula as the topcor but with a different coating?
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Old 04-28-2011   #27
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I have several Topcor 50/2 LTM lenses and the Leonon 50/2. The Leonon looks very similar to one of the Topcor lenses (ridged black barrel), but not exactly. The images produced look similar enough (i.e., Topcors are all very fine lenses, and so is the Leonon). Without any other information, I would guess that Tokyo Kogaku made the Leonon, and they made it with the same optical formula as the Topcors. The coating used would have been whatever was current at the time. (I don't bother with the color of coatings too much -- coating technology was always changing, and I'm quite color blind.)

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Old 10-29-2011   #28
flip
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Finally landed a topcor 50/1.5. :-) A single bubble in the glass, but otherwise clean. And sharp. I look forward to trying it out ASAP.
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Old 10-29-2011   #29
mrlazyli
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I had Tokyo Simlar 50/1.5, Topcor 50/1.8, 50/2, 50/3.5 and Leotax Leonon 50/2

All of them are excellent performers!

The 50/1.5 formula is a bit strange. It has triplet which looks at Sonnar at the front half, but the rear group is normal Planar design. I think the Canon 85/1.5 also has similar design.

The other Topcor, Leonon and Fujinon 50/2 are Planar design. Very sharp indeed!

Topcor 50/1.5


Topcor 50/1.8


Topcor 50/2


Leonon 50/2
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Old 11-12-2011   #30
mrlazyli
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[quote=PAN F;1749848][quote=mrlazyli;1741919]I had Tokyo Simlar 50/1.5, Topcor 50/1.8, 50/2, 50/3.5 and Leotax Leonon 50/2
The other Topcor, Leonon and Fujinon 50/2 are Planar design. Very sharp indeed!
Quote:

Hello mrlazyli,
You say that the Fujinon 50/2 is a Planar design, do know anywhere were the Fujinon L lens diagrams are available?
I have a Japanese book series that introduces the LTM/M lenses (> 300 lenses)
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Old 11-12-2011   #31
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[quote=mrlazyli;1751006][quote=PAN F;1749848]
Quote:
Originally Posted by mrlazyli View Post
I had Tokyo Simlar 50/1.5, Topcor 50/1.8, 50/2, 50/3.5 and Leotax Leonon 50/2
The other Topcor, Leonon and Fujinon 50/2 are Planar design. Very sharp indeed!
I have a Japanese book series that introduces the LTM/M lenses (> 300 lenses)
sounds cool!
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Old 11-12-2011   #32
mrlazyli
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Quote:
Originally Posted by PAN F View Post
Hello mrlazyli,
That's great that you have such information.Does it say what design the 5cm f2.8 Fujinon is?.
Could you tell me if this book is still in print only quite a few forum members are interested in these vintage Japanese LTM lenses produced by Fuji,Topcon,Zunow etc., (forum members Hacker,tooffy etc.,and myself included) and information is very difficult to find even on the web.
As far as i remember, it is Tessar formula likes most 50/2.8, 50/3.5 lenses, but i lend that book to my friend so cannot be sure yet.
i think that book series is still available and there is a bookstore selling at Hong Kong
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Old 11-12-2011   #33
rlouzan
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Fujinon-L 5cm f2 ltm
http://www.kitamura.jp/photo/repairer/2011/re703.html

http://ameblo.jp/csstp/entry-10695878935.html

Last edited by rlouzan : 11-13-2011 at 09:59.
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Old 12-29-2011   #34
fotobiblios
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I had a couple of Leotaxes and both had Konishiroku lenses (Hexanon 50mm f1.9 and Hexar 50mm f3.5)
Danny
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Old 08-20-2013   #35
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I've had a Topcor-S 50/2 for a while now, its a great lens, very sharp wide open which makes focusing a breeze on my NEX-7, its color is fantastic, its perfect for candid shots wide open, sadly I don't have anything online at the moment.

It's a real shame that Topcon don't still make camera lenses as they were a top quality manufacture as good as Zeiss or Leica.
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Is the topcor-s50/2 radioactive?
Old 09-20-2013   #36
Yeasaen
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Is the topcor-s50/2 radioactive?

Read about some radioactive lenses and topcor was mentioned but maybe not this model? I have one and its a beautiful rendering lens
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