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CJZ Biotar 1.5/75 (converted to LTM)
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PostPosted: Thu Oct 08, 2009 9:39 pm    Post subject: Reply with quote
this is just for your info Smile

I have played with this on our site --

have a look at it -- it's a fun -- I hope I put correct registers in Smile

http://www.cameraserviceone.com/061000-registers.php

tf


PostPosted: Thu Oct 08, 2009 9:48 pm    Post subject: Reply with quote
Nice and helpful Stan!

I just used
http://www.graphics.cornell.edu/~westin/misc/mounts-alphabetical.html
http://www.graphics.cornell.edu/~westin/misc/mounts-by-register.html
before.


PostPosted: Thu Oct 08, 2009 10:36 pm    Post subject: Reply with quote
Thank you guys, Tf and Klaus.

That HP is fun, trifox. I saved one of HP address to my fav, Klaus.

I did shoot with this lens in this way

The lens (with brass base + original shim) + M42->EF adapter + EOS_5D
and holding the lens by left hand and press to M42 adapter, lens focus to
1 m and F1.5. Moving whole thing to focus, and press button. No AF shot, Orio. Very Happy
In this setting the lens go very slightly beyond inf, so this lens was intended for
Zenith M39 lens. Here is examples...

Sorry for very boring and bad shots.... Embarassed




Bokeh is very creamy at f1.5, sharpness is alright for at wide open.

I am going to sand M39->M42 (2 mm thick) down, and take out the shim in the lens.
The lens will be reborn as an M42 CZJ Biotar 1,5/75.

According to CZJ's serial number table for production date, this lens was made
between 1970 and 1975. This looks odd to me, the lens does not have coating?!


PostPosted: Thu Oct 08, 2009 10:59 pm    Post subject: Reply with quote
Stan,

you have "green light" - go ahead!! It is all clear to me now.

Cheers,


PostPosted: Thu Oct 08, 2009 11:01 pm    Post subject: Reply with quote
That lens should certainly be coated, but I am very astonished about the 1970++ production year you mentioned. Let me have the serial number and I look it up for you.


PostPosted: Thu Oct 08, 2009 11:29 pm    Post subject: Reply with quote
Sorry my mistake, mine was made before 1945, like me. Very Happy
SN# 2,688,189

No surprise?


PostPosted: Thu Oct 08, 2009 11:32 pm    Post subject: Reply with quote
OK, now that fits...


PostPosted: Fri Oct 09, 2009 7:02 am    Post subject: Reply with quote
kds315* wrote:
Stan,

you have "green light" - go ahead!! It is all clear to me now.

Cheers,


Thanks, Klaus! Wink

S


PostPosted: Fri Oct 09, 2009 4:04 pm    Post subject: Reply with quote
I may ask the modification for this lens eventually, Stan. Very Happy
But not now, I want to do some experiments. Smile


PostPosted: Sat Oct 10, 2009 11:00 pm    Post subject: Reply with quote
I just bought M39->EF adapter with AF confirmation chip US$26.

Now I can shoot without worries for the time being. Very Happy
Everything is alright (will be) after receiving the adapter hopefully. Smile


PostPosted: Sat Oct 10, 2009 11:16 pm    Post subject: Reply with quote
koji wrote:
I just bought M39->EF adapter with AF confirmation chip US$26.

Now I can shoot without worries for the time being. Very Happy
Everything is alright (will be) after receiving the adapter hopefully. Smile


That's cool!

the LTM conversion is MORE TRICKY than one could say..

If we do it -- We'll be heroes Smile !

stan - TF


PostPosted: Sun Oct 11, 2009 12:21 am    Post subject: Reply with quote
STAN,

don't do that to my nerves....now all of a sudden it's TRICKY??


PostPosted: Sun Oct 11, 2009 6:46 am    Post subject: Reply with quote
congrats for the site tF, great job!
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