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Biotar 75mm f1.5 M42 mount
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PostPosted: Thu Mar 12, 2009 4:40 pm    Post subject: Biotar 75mm f1.5 M42 mount Reply with quote
Click here to see on Ebay


PostPosted: Thu Mar 12, 2009 5:04 pm    Post subject: Reply with quote
That is a really clean one.
Not to be the master of the obvious (MOO).


That one won't go to cheap ;


PostPosted: Thu Mar 12, 2009 5:06 pm    Post subject: Reply with quote
Never more cheap Biotar 75mm I guess.


PostPosted: Thu Mar 12, 2009 5:33 pm    Post subject: Reply with quote
Everytime I see this lens, I start be angry about myself.
My favourite seller in Solms once offered me one in great condition and professionally rebuilt to M42 for €300,-.

I could have sold it for a lot more, I guess. Sad


PostPosted: Thu Mar 12, 2009 5:35 pm    Post subject: Reply with quote
Yes. 300 EUR is not much for one of the finest lens on this planet. I didn't know better sharper lens in this focal length. Even if lot more expensive not significantly better.


PostPosted: Thu Mar 12, 2009 6:35 pm    Post subject: Reply with quote
Let's see, maybe I have some luck, although I would prefer the older type...

Last edited by kds315* on Sun Mar 15, 2009 8:22 pm; edited 1 time in total


PostPosted: Thu Mar 12, 2009 7:29 pm    Post subject: Reply with quote
The Biotar 75 is just amazing for a 50+ year old lens IMO. Cool

I have two late alu copies like in the link - one M42, one Exakta and will never sell them.


PostPosted: Sun Mar 15, 2009 8:24 pm    Post subject: Reply with quote
How complicated would be cleaning/relubing/ infinity lens mount conversion to Nikon, Bob?


PostPosted: Sun Mar 15, 2009 9:13 pm    Post subject: Reply with quote
kds315* wrote:
How complicated would be cleaning/relubing/ infinity lens mount conversion to Nikon, Bob?


Not complicated ,but don't convert.


PostPosted: Sun Mar 15, 2009 9:21 pm    Post subject: Reply with quote
Some of the Biotar designs do not work on the Bessaflex, as the rear element protrudes when closer to infinity and interferes with the mirror mechanism.

I wonder if that version will work on the Bessaflex? Anyone know?


PostPosted: Sun Mar 15, 2009 9:41 pm    Post subject: Reply with quote
Attila wrote:
kds315* wrote:
How complicated would be cleaning/relubing/ infinity lens mount conversion to Nikon, Bob?


Not complicated ,but don't convert.


Yes I know, but for a special project I need to...


PostPosted: Sun Mar 15, 2009 9:49 pm    Post subject: Reply with quote
I have no idea how you can adjust without serious modification to support infinity. I did remember wrongly I did remember to Pentax modification. What is perhaps easier due shorter register difference.


PostPosted: Mon Mar 16, 2009 7:57 am    Post subject: Reply with quote
bob955i wrote:
The Biotar 75 is just amazing for a 50+ year old lens IMO. Cool

I have two late alu copies like in the link - one M42, one Exakta and will never sell them.


Hi Bob
I would like to know the result of both your Biotar 75.
Is it same or have any different ?

Thanks
Siswono


PostPosted: Mon Mar 16, 2009 8:16 pm    Post subject: Reply with quote
Attila wrote:
I have no idea how you can adjust without serious modification to support infinity. I did remember wrongly I did remember to Pentax modification. What is perhaps easier due shorter register difference.


I could calibrate all lens without serious modification, that I opened! It was only mechanical trick, or removing the focus stop limiter, or turn the lens group 1 round more... And it is reversible! Altough, especially i don't know the biotar's mechanical structure, but the zeiss lens I opened it was easy. I have a lot lens, but I haven' got so much time to find out the trick how to reach infinity for all lens. It can take several hours to find out, how to reach infinity!


PostPosted: Wed Mar 18, 2009 7:11 pm    Post subject: Reply with quote
Final bid EUR 555.00

Winner: zero feedback buyer who joined late and drew final price up

2nd place: experienced sniper who entered a that's-overprice-but-it-must-win-the-auction -bid at justsnipe.com

3rd place: someone new who really wanted it but retired when price went beyond

Now why am I having this strange déja vû -experience?


PostPosted: Wed Mar 18, 2009 7:17 pm    Post subject: Reply with quote
Price went to double in last year on Biotar 75mm f1.5.


PostPosted: Wed Mar 18, 2009 7:46 pm    Post subject: Reply with quote
Just revisited this thread and saw the questions.

Klaus wrote:
How complicated would be cleaning/relubing/ infinity lens mount conversion to Nikon, Bob?


Cleaning and relube should be relatively straightforward but might be a bit fiddly - I've only ever cleaned the inside of the front element of the Exakta mount copy and it was easy enough apart from the retaining ring which is incredibly thin and very difficult to get started on the threads. The front element and one of the centre groups can be removed as a complete unit leaving the rear groups and focus helix intact. There are also retaining rings at the the lens' rear but they are very deeply recessed and difficult to access. I've never had to go any further though as the focus is nice and smooth. The M42 copy is spotless so no need to disturb it either.

As for full infinity conversion to Nikon, sorry no idea as I'm a Canon shootist although I do believe it has been done as I seem to recall a Nikon mount Biotar 75 being offered on Ebay. Whether the conversion achieved and retained the lens' standard capabilities and what the conversion cost, I can't say. I think Luis provided an article on focus recalibration though so that would be half the battle.

Esox Lucius wrote:
Some of the Biotar designs do not work on the Bessaflex, as the rear element protrudes when closer to infinity and interferes with the mirror mechanism.

I wonder if that version will work on the Bessaflex? Anyone know?


The late fat alu Biotar 75 will work OK on the Bessaflex - I have this camera and can confirm this detail. If you also want a Biotar 58 that will work on the Bessie, look for the semi-auto version as fitted to some of the old Pentacon F series of cameras - I can also confirm this version works on the EOS 5D without mirror shaving or other issues.

Siswono wrote:
I would like to know the result of both your Biotar 75.
Is it same or have any different ?


They're both the same - if there are any differences, they're so neglible that I can't see them in practice.

HTH

Bob.


PostPosted: Wed Mar 18, 2009 7:50 pm    Post subject: Reply with quote
Attila wrote:
Price went to double in last year on Biotar 75mm f1.5.

And this is not even the red T version Shocked


PostPosted: Wed Mar 18, 2009 8:07 pm    Post subject: Reply with quote
no-X wrote:
Attila wrote:
Price went to double in last year on Biotar 75mm f1.5.

And this is not even the red T version Shocked


red T or not most people not makes difference and this is all right. I think all same superb lens, no difference.


PostPosted: Wed Mar 18, 2009 8:11 pm    Post subject: Reply with quote
If I remember correctly, red T Biotars were more expensive... But it seems, that all 75mm Biotars are so rare at this time, that people don't care about it.


PostPosted: Wed Mar 18, 2009 8:18 pm    Post subject: Reply with quote
no-X wrote:
If I remember correctly, red T Biotars were more expensive... But it seems, that all 75mm Biotars are so rare at this time, that people don't care about it.


Yes, red T means famous Zeiss T coating. If lens was cleaned T coating is already gone these lenses are 50 yrs old. Most of them was cleaned even if wasn't need (buyer like shinny items) Wink


PostPosted: Wed Mar 18, 2009 8:45 pm    Post subject: Reply with quote
None of my Biotar brace have the red 'T'.

AFAIK the Jena red 'T' mark ('T' for "Transparenz") just indicates the lens is coated, albeit single, but sometimes there is no 'T' mark as in my two lenses' case, but the lens is still coated so there's no real advantage in only seeking out red 'T' marked Jena Biotars or indeed paying more for such. The red 'T' marked coating of the Jena lenses is not the same as the Oberkochen T* coating as one would expect, being separated by a couple of decades experience and improvement.


PostPosted: Wed Mar 18, 2009 8:56 pm    Post subject: Reply with quote
Yes, both versions (T or not T) are coated, but the T coating is a bit darker - reflects less light (not true only for tessars, which possibly uses the less effective coating even if marked by T)
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