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kitson306
Joined: 11 Feb 2012
Posts: 5
Location: Hong Kong
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 Posted: Sat Feb 11, 2012 6:14 am Post subject: Pre-war Biotar in M42 |
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kitson306 wrote:
Hi there, I've been researching my biotar have come across this post. I think all the experts of biotars are here and hope you guys can help.
From the photos I see, I'm sure it's a PRE-WAR Version.
Serial number starts at 2688XXX.... so roughly 1941
Weight is 416g, the lighter of the lens.
no T coating
7,5 cm ...not 75 mm
mount: M42!!! now this is where I get confused!!
I've searched high and low and cannot find anything on a Pre-war biotar with M42 mount.
If does not look like it's switched of fabricated. Seems to be original from the factory.
Do you guys think this is a Prototype? Definitely a collector's item i would think.
Any info would be great! Also value of the lens.. it's in pretty good condition.
I'm in Hong Kong and if anyone's near by, they can come have a look!
Cheers,
Kitson
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exaklaus
Joined: 11 Aug 2009
Posts: 1633
Location: Niederrhein, Germany
Expire: 2011-12-02
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| Posted: Sat Feb 11, 2012 6:39 am Post subject: |
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exaklaus wrote:
Nice one. You are sure it is M42, not M40?, which would mean it is for Praktiflex.
If M42, it was altered at some time in it's life. No prototype, as M42 was introduced after WWII.
Klaus
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kitson306
Joined: 11 Feb 2012
Posts: 5
Location: Hong Kong
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| Posted: Sat Feb 11, 2012 6:49 am Post subject: |
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kitson306 wrote:
| exaklaus wrote: |
Nice one. You are sure it is M42, not M40?, which would mean it is for Praktiflex.
If M42, it was altered at some time in it's life. No prototype, as M42 was introduced after WWII.
Klaus |
thanks Klaus,
I have a M42 to EOS adapter and it fits really smoothly. I did a search on wiki for the M42 and M40 and come back with this...
| Quote: |
| The M42 mount was first developed by Carl Zeiss at their Jena plant in 1938 at the request of the KW camera company for their Praktica line, which had previously used M40 (40 mm by 1 mm DIN). |
http://en.wikipedia.org/wiki/M42_lens_mount
Do you think it's possible that it's one of the first ones made for M42? I think it'd be easy to make it from M42 to M40, but to add 2mm back on the thread would be a much tougher job..
Any insights?
thanks!
Kitson |
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exaklaus
Joined: 11 Aug 2009
Posts: 1633
Location: Niederrhein, Germany
Expire: 2011-12-02
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| Posted: Sat Feb 11, 2012 7:01 am Post subject: |
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exaklaus wrote:
Who knows...
But I don't believe that as first Praktiflex was released in 1939!
There was no Praktica until end of 1949 (m42) and the Contax S (m42) was released as first m42 camera end of 1949, too.
I'd bet that your lens has not the original base. Compare with the other pre-war lenses. There is no depth of field scale on yours.
Not the screw mount was altered to m42, the complete rear end was swapped.
Klaus
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Attila
Joined: 24 Feb 2007
Posts: 57865
Location: Hungary
Expire: 2025-11-18
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| Posted: Sat Feb 11, 2012 12:22 pm Post subject: |
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Attila wrote:
+1 altered lens , but no matter be happy , not many people have it!
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kitson306
Joined: 11 Feb 2012
Posts: 5
Location: Hong Kong
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| Posted: Sun Feb 12, 2012 7:31 am Post subject: |
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kitson306 wrote:
I would think so too! Makes much more sense!
Any idea how much it would be worth??
Thx!
Kitson
| Attila wrote: |
| +1 altered lens , but no matter be happy , not many people have it! |
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exaklaus
Joined: 11 Aug 2009
Posts: 1633
Location: Niederrhein, Germany
Expire: 2011-12-02
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| Posted: Sun Feb 12, 2012 8:01 am Post subject: |
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exaklaus wrote:
| kitson306 wrote: |
I would think so too! Makes much more sense!
Any idea how much it would be worth??
Thx!
Kitson
| Attila wrote: |
| +1 altered lens , but no matter be happy , not many people have it! |
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Difficult to make an estimate, but I'd bet something between $600 and 1100
Klaus
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Fuji GW690III, Fuji G617, Fujifilm X-E1
Bessaflex TM
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Summilux-R 1:1,4/50
Canon FD 85mm 1:1,2
Color-Heliar 75mm F2.5 SL
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kitson306
Joined: 11 Feb 2012
Posts: 5
Location: Hong Kong
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| Posted: Tue Feb 21, 2012 12:11 pm Post subject: |
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kitson306 wrote:
after some more research, and talked to some old school camera guys here locally, they said it should be a T2 mount. Not sure where this leads.. |
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exaklaus
Joined: 11 Aug 2009
Posts: 1633
Location: Niederrhein, Germany
Expire: 2011-12-02
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| Posted: Tue Feb 21, 2012 12:22 pm Post subject: |
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exaklaus wrote:
| kitson306 wrote: |
| after some more research, and talked to some old school camera guys here locally, they said it should be a T2 mount. Not sure where this leads.. |
T2 (that's a more modern thing) would mean it can be adapted by cheap adapters to every SLR.
But I doubt that it is T2. T2 has a finer thread.
Anyway, there should be a camera shop somewhere with an old praktica or pentax to try if it is M42....
Klaus
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Canon 5D II,
Fuji GW690III, Fuji G617, Fujifilm X-E1
Bessaflex TM
Tachihara 4"x5"
Summilux-R 1:1,4/50
Canon FD 85mm 1:1,2
Color-Heliar 75mm F2.5 SL
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ForenSeil
Joined: 15 Apr 2011
Posts: 2726
Location: Kiel, Germany.
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| Posted: Tue Feb 21, 2012 12:41 pm Post subject: |
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ForenSeil wrote:
It's M42 when it fits into your EOS Adapter. As said T2 is also 42mm but has a finer thread and won't fit into your adapter.
so
+1 for altered lens, because theres no depth of field scale. I wonder who made this modification. I would say it's about 600-800€ worth if the glas is without haze and focus and aperture are not stiff.
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kitson306
Joined: 11 Feb 2012
Posts: 5
Location: Hong Kong
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| Posted: Wed Feb 22, 2012 4:58 am Post subject: |
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kitson306 wrote:
I think this mystery will never be solved.
The modification, T2 or M42, doesn't look like any aftermarket work. The metals on the top and bottom are similar in color and quality, also the age seems to match. There's no welding marks anywhere so the whole bottom must have been swapped.
I think there's more to it than just a hollow bottom as the elements seems to be sliding on rails on the inner size. this would make it extremely hard to mill out a bottom just for this.
Another old lens expert suggest it might have been a custom order lens for military use or a limited run for some gov't work, etc. But no way to tell, and no way to proof.
| ForenSeil wrote: |
It's M42 when it fits into your EOS Adapter. As said T2 is also 42mm but has a finer thread and won't fit into your adapter.
so
+1 for altered lens, because theres no depth of field scale. I wonder who made this modification. I would say it's about 600-800€ worth if the glas is without haze and focus and aperture are not stiff. |
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