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Biotar 1.5/75
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PostPosted: Mon Aug 18, 2008 10:24 pm    Post subject: Biotar 1.5/75 Reply with quote

What is a reasonable price for this lens?


PostPosted: Mon Aug 18, 2008 10:35 pm    Post subject: Reply with quote

Around 400 USD is fine. I bought many of them 400-600 USD was purchase price.


http://www.mflenses.com/rokreporter/run.html


PostPosted: Mon Aug 18, 2008 10:39 pm    Post subject: Reply with quote

I wanted this lens so bad that I just bit the bullet...
May not be a bargain...but I paid over $500 for it... Sad


PostPosted: Mon Aug 18, 2008 10:41 pm    Post subject: Reply with quote

This was the lens...

Did I do okay?

http://cgi.ebay.com/Excellent-German-Zeiss-lens-Biotar-1-5-75-for-Praktina_W0QQitemZ160273864812QQihZ006QQcategoryZ3323QQssPageNameZWDVWQQrdZ1QQcmdZViewItem


PostPosted: Mon Aug 18, 2008 10:45 pm    Post subject: Reply with quote

This lens is good for $1000 or more
when you get it you will see. You made a good deal never mind this lens is one of the top lenses, rare CARL ZEISS so 100 USD more or less doesn't matter. On rare items like this I never think about much to take it. Unbelievable sharp even at wide open, this was one of your best investment. This lens will keep it's value 10 yrs later also.I believe your digital gears value will less than a few bucks. People are strange they are buy new digital bullshits for 2000 USD or more and afraid to pay 500 USD for a masterpiece.


PostPosted: Mon Aug 18, 2008 10:45 pm    Post subject: Reply with quote

huhging wrote:
This was the lens...

Did I do okay?

http://cgi.ebay.com/Excellent-German-Zeiss-lens-Biotar-1-5-75-for-Praktina_W0QQitemZ160273864812QQihZ006QQcategoryZ3323QQssPageNameZWDVWQQrdZ1QQcmdZViewItem


Just a bit harder to mount than others because of the Praktina bayonet. I don't think any adapter exists.


PostPosted: Mon Aug 18, 2008 10:48 pm    Post subject: Reply with quote

Adapter is not exists you need to convert, if need any assistance let me know I have qualified technician who able to do it.


PostPosted: Mon Aug 18, 2008 10:50 pm    Post subject: Reply with quote

No adapters available? Shocked

I'm doomed....
It says it fits contax/yashica
I can't use C/Y to EOS adapter?
Please help....


PostPosted: Mon Aug 18, 2008 10:52 pm    Post subject: Reply with quote

Attila wrote:
Adapter is not exists you need to convert, if need any assistance let me know I have qualified technician who able to do it.


Is he/she in US?


PostPosted: Mon Aug 18, 2008 11:02 pm    Post subject: Reply with quote

No, I know a guy in US too who able to do it. He is our member.

In this case cost effective to return to the seller or ask money from him before he send out.

This lens is NOT Contax/Yashica compatible.


PostPosted: Mon Aug 18, 2008 11:07 pm    Post subject: Reply with quote

I really rather not go through the hassel of returning the lens...
How much will it cost to convert the mount?


PostPosted: Mon Aug 18, 2008 11:08 pm    Post subject: Reply with quote

Quote:
No, I know a guy in US too who able to do it. He is our member.

In this case cost effective to return to the seller or ask money from him before he send out.

This lens is NOT Contax/Yashica compatible.


This lens looks a really nice one. It may be worth it to do the convertion. I am not familiar with the Practina mount. Usually I would think that it is more sacred to keep the native mount. If this lens will never be used again because the mount is not useful then I say it should be converted. It should not cost more than it will be worth. As we all know the performance and character of this lens Wink Maybe you can get the seller to credit you a discount since they gave a false description Rolling Eyes


PostPosted: Mon Aug 18, 2008 11:11 pm    Post subject: Reply with quote

Good idea to ask for partial refund, should cover conversation cost.

Our member is: BobDodds who is able to do it and living in USA.

I sent you in pm Hungarian technician name and email.


Last edited by Attila on Mon Aug 18, 2008 11:13 pm; edited 1 time in total


PostPosted: Mon Aug 18, 2008 11:12 pm    Post subject: Reply with quote

Oh yes Bob is a top notch tech. He is a high quality person as well with a passion for these lenses. If he will do it for you it will be perfect.


PostPosted: Mon Aug 18, 2008 11:18 pm    Post subject: Reply with quote

Praktina mount can sometimes be very easy to convert.

The register distance is VERY long in Praktina, 50mm. That means there is a lot of room to play with for any current SLR mount, even Nikon.

If you don't find a pro who can make an adapter cheaply, it looks reasonably easy to make a home-brew adapter.

The pictures of your lens (and it looks like its in lovely shape, good buy !) shows a very short external barrel (which is too wide for a t-mount) and a rather long internal one, which should fit in a T-mount easily.

I think my favorite method of an adapted T-mount will probably work neatly. You could start with an EOS T-mount, remove the inner ring, and work from there. If the setscrews are too short you can buy longer screws. Or you can use the tape method (don't laugh, it works, I use it on a Telemegor 400) - wrap electrical tape neatly around the barrel where you want the screws to bear until its thick enough to fit closely inside the t-mount, then screw in place. The tape will also protect the lens barrel.

You may need to grind a bit off the inside of the opening of the t-mount to clear the Praktina bayonet lugs, those look like they will interfere. A Dremel tool works wonderfully for this sort of thing.

There are many other ways of doing this too. An M42->EOS adapter is another starting point, or an EOS reverse adapter, or even an EOS metal body cap.


PostPosted: Mon Aug 18, 2008 11:21 pm    Post subject: Reply with quote

I estimate costs if you would convert here in Hungary, labor fee: from 60 USD
shipping cost both way 70 USD so at least 120 USD.


PostPosted: Mon Aug 18, 2008 11:23 pm    Post subject: Reply with quote

When I look at the pictures of the listing I notice a couple things. It seems the rear element position suggest a very long register distance. This should make it less difficult to adapt. Also the mount is quite simple it may be possible to have an adapter ring made rather than a full conversion. I would suggest go to M42 rather than Eos. This will give you mount flexibility to Pentax, Sony, or Sigma in the future. Your chances for success here seem high. Cool


PostPosted: Mon Aug 18, 2008 11:26 pm    Post subject: Reply with quote

Sorry Luis I did not see that you already made a comment about the register. I was typing while you where posting Embarassed 50mm is indeed quite long.


PostPosted: Mon Aug 18, 2008 11:43 pm    Post subject: Reply with quote

F16SUNSHINE wrote:
When I look at the pictures of the listing I notice a couple things. It seems the rear element position suggest a very long register distance. This should make it less difficult to adapt. Also the mount is quite simple it may be possible to have an adapter ring made rather than a full conversion. I would suggest go to M42 rather than Eos. This will give you mount flexibility to Pentax, Sony, or Sigma in the future. Your chances for success here seem high. Cool


Does this mean that I can buy an adapter to M42 mount and put another M42 to EOS adapter ring?


PostPosted: Mon Aug 18, 2008 11:46 pm    Post subject: Reply with quote

You would need to have made a custom adapter to m42 mount. Then you would buy a m42-eos adapter. Of course you may already have one.


PostPosted: Mon Aug 18, 2008 11:49 pm    Post subject: Reply with quote

luisalegria wrote:
Praktina mount can sometimes be very easy to convert.

The register distance is VERY long in Praktina, 50mm. That means there is a lot of room to play with for any current SLR mount, even Nikon.

If you don't find a pro who can make an adapter cheaply, it looks reasonably easy to make a home-brew adapter.

The pictures of your lens (and it looks like its in lovely shape, good buy !) shows a very short external barrel (which is too wide for a t-mount) and a rather long internal one, which should fit in a T-mount easily.

I think my favorite method of an adapted T-mount will probably work neatly. You could start with an EOS T-mount, remove the inner ring, and work from there. If the setscrews are too short you can buy longer screws. Or you can use the tape method (don't laugh, it works, I use it on a Telemegor 400) - wrap electrical tape neatly around the barrel where you want the screws to bear until its thick enough to fit closely inside the t-mount, then screw in place. The tape will also protect the lens barrel.

You may need to grind a bit off the inside of the opening of the t-mount to clear the Praktina bayonet lugs, those look like they will interfere. A Dremel tool works wonderfully for this sort of thing.

There are many other ways of doing this too. An M42->EOS adapter is another starting point, or an EOS reverse adapter, or even an EOS metal body cap.


Thank you all for your help.
I'm not good with fixing things...
I'm afraid that I may ruin the lense if I try to make the adaption by tearing it apart.... Crying or Very sad

If I want to use this lens on Nikon Camera, using M42 adapter will work okay?


PostPosted: Mon Aug 18, 2008 11:50 pm    Post subject: Reply with quote

F16SUNSHINE wrote:
You would need to have made a custom adapter to m42 mount. Then you would buy a m42-eos adapter. Of course you may already have one.


Where do I get the custom adapter to M42 mount?


PostPosted: Mon Aug 18, 2008 11:55 pm    Post subject: Reply with quote

An M42 reverse adapter may work as a starting point. On one side this is a male M42, on the other its (usually) a 52mm filter ring.

If the inner barrel of the Biotar fits inside this, then it seems to me that if you drill and tap the reverse adapter and the Praktina lugs, you can screw the reverse adapter directly to them. If this doesn't give you the M42 register distance (which is 4.5mm shallower than Praktina) then you can add a spacer.

There are probably a million ways to do this.


PostPosted: Mon Aug 18, 2008 11:57 pm    Post subject: Reply with quote

huhging wrote:
luisalegria wrote:
Praktina mount can sometimes be very easy to convert.

The register distance is VERY long in Praktina, 50mm. That means there is a lot of room to play with for any current SLR mount, even Nikon.

If you don't find a pro who can make an adapter cheaply, it looks reasonably easy to make a home-brew adapter.

The pictures of your lens (and it looks like its in lovely shape, good buy !) shows a very short external barrel (which is too wide for a t-mount) and a rather long internal one, which should fit in a T-mount easily.

I think my favorite method of an adapted T-mount will probably work neatly. You could start with an EOS T-mount, remove the inner ring, and work from there. If the setscrews are too short you can buy longer screws. Or you can use the tape method (don't laugh, it works, I use it on a Telemegor 400) - wrap electrical tape neatly around the barrel where you want the screws to bear until its thick enough to fit closely inside the t-mount, then screw in place. The tape will also protect the lens barrel.

You may need to grind a bit off the inside of the opening of the t-mount to clear the Praktina bayonet lugs, those look like they will interfere. A Dremel tool works wonderfully for this sort of thing.

There are many other ways of doing this too. An M42->EOS adapter is another starting point, or an EOS reverse adapter, or even an EOS metal body cap.


Thank you all for your help.
I'm not good with fixing things...
I'm afraid that I may ruin the lense if I try to make the adaption by tearing it apart.... Crying or Very sad

If I want to use this lens on Nikon Camera, using M42 adapter will work okay?


To use on Nikon you need a Nikon mount conversion, M42 lenses on Nikon body not support infinity.


PostPosted: Mon Aug 18, 2008 11:59 pm    Post subject: Reply with quote

I would suggest Bob Dodds. He is a member here and you can send him a PM. Search the memberlist for his PM box. He goes by: BobDodds

If he does not do it you should check into the guy Attila knows in Hungary.