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thePiRaTE!!
Joined: 31 Oct 2008 Posts: 416 Location: Canada
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Posted: Tue Apr 14, 2009 8:09 am Post subject: Biotar 75 - front section / elements disassembly ? |
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thePiRaTE!! wrote:
Hi all. Wondering if anyone might have some information about disassembling a Biotar 75 from the front section? It appears from the back, the furthest one can get is to the preset aperture ring. I'd like to remove a little dust internally.
Regards,
Kelly. _________________ kellysereda.com
Sony A7ii, A900, NEX-5
_______________________
Helios: 1.5/85 40-2.
Meyer-Optik: Trioplan 2.8/100, Oreston 1.8/50.
Minolta: Rokkor-PG 1.2/58.
Porst: 1.2/55 Color Reflex.
Sony: 4-5.6/70-400 G.
Takumar: Super Takumar 3.5/135, Super Takumar 1.4/50, SMC Takumar 3.5/28.
Topcon: Topcor 1.4/58.
Voigtländer: Nokton Classic SC 1.4/35.
Zeiss: Planar T*1.2/85 "60 jahre" C/Y, Vario-Sonnar T*3.4/35-70 C/Y, Vario-Sonnar T*2.8/16-35 ZA, Distagon T*2/24 ZA.
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luisalegria
Joined: 07 Mar 2008 Posts: 6627 Location: San Francisco, USA
Expire: 2018-01-18
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Posted: Wed Apr 15, 2009 2:47 am Post subject: |
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luisalegria wrote:
I've done this on my late "fat" Biotar. Its quite easy.
I don't recommend it unless you have a significant haze problem. A bit of dust probably doesn't justify it.
The key is a tiny screw on the black barrel just above the preset ring, its opposite the red triangle aperture mark. Loosen that and the filter ring unscrews, etc. _________________ I like Pentax DSLR's, Exaktas, M42 bodies of all kinds, strange and cheap Japanese lenses, and am dabbling in medium format/Speed Graphic work. |
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thePiRaTE!!
Joined: 31 Oct 2008 Posts: 416 Location: Canada
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Posted: Wed Apr 15, 2009 5:34 am Post subject: |
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thePiRaTE!! wrote:
luisalegria wrote: |
I've done this on my late "fat" Biotar. Its quite easy.
I don't recommend it unless you have a significant haze problem. A bit of dust probably doesn't justify it.
The key is a tiny screw on the black barrel just above the preset ring, its opposite the red triangle aperture mark. Loosen that and the filter ring unscrews, etc. |
Thanks Luis. I should have just PM'd you to start with, heh. I did take out the little screw on one copy and gave an uncertain, yet firm twist but to no avail. I wasn't sure that was the trick, thanks. I'll try again.
Truth be told, I have two copies here, of which I am assembling a 'super' version using the cleaner glass from the Exa version with the compatible M42 mount. I've tried this in easier ways, first switching the mount back caps. The Exa fit on both Biotars, the M42 back was only able to fit on its original Biotar. So I moved up the chain, I moved the helical ring over. This time, the ring from the M42 version fits either lens, but the ring from the Exa only fits its original helical. Therefore, I can swap the M42 ring and thus mount cap over to the rest of the Exa, but then the remaining Exa version would not thread to the M42 body. I could stop here and sell the rest of the parts seperately, but I want to go another step with this first.
Fwiw, I've discovered I'm a lot more patient than I used to be and the results of my efforts have been positive thus far. There appears to be some tiny white hazy spots on an element in the 'back-up' glass block I'll address while going into the top. It may result in my not needing to swap the parts to start with if I can clear it up.
Thanks again. For now...
K. _________________ kellysereda.com
Sony A7ii, A900, NEX-5
_______________________
Helios: 1.5/85 40-2.
Meyer-Optik: Trioplan 2.8/100, Oreston 1.8/50.
Minolta: Rokkor-PG 1.2/58.
Porst: 1.2/55 Color Reflex.
Sony: 4-5.6/70-400 G.
Takumar: Super Takumar 3.5/135, Super Takumar 1.4/50, SMC Takumar 3.5/28.
Topcon: Topcor 1.4/58.
Voigtländer: Nokton Classic SC 1.4/35.
Zeiss: Planar T*1.2/85 "60 jahre" C/Y, Vario-Sonnar T*3.4/35-70 C/Y, Vario-Sonnar T*2.8/16-35 ZA, Distagon T*2/24 ZA.
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thePiRaTE!!
Joined: 31 Oct 2008 Posts: 416 Location: Canada
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Posted: Wed Apr 15, 2009 5:51 am Post subject: |
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thePiRaTE!! wrote:
Hmm. I haven't been able to move it a smidge. Assuming turning the topmost filter ring section is correct, the one copy appears really stuck down. Might I ask you to elaborate when you the chance Luis?
Many thanks,
K. _________________ kellysereda.com
Sony A7ii, A900, NEX-5
_______________________
Helios: 1.5/85 40-2.
Meyer-Optik: Trioplan 2.8/100, Oreston 1.8/50.
Minolta: Rokkor-PG 1.2/58.
Porst: 1.2/55 Color Reflex.
Sony: 4-5.6/70-400 G.
Takumar: Super Takumar 3.5/135, Super Takumar 1.4/50, SMC Takumar 3.5/28.
Topcon: Topcor 1.4/58.
Voigtländer: Nokton Classic SC 1.4/35.
Zeiss: Planar T*1.2/85 "60 jahre" C/Y, Vario-Sonnar T*3.4/35-70 C/Y, Vario-Sonnar T*2.8/16-35 ZA, Distagon T*2/24 ZA.
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Attila
Joined: 24 Feb 2007 Posts: 57840 Location: Hungary
Expire: 2021-11-18
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Posted: Wed Apr 15, 2009 8:59 am Post subject: |
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Attila wrote:
Don't risk this lens! _________________ -------------------------------
Items on sale on Ebay
Sony NEX-7 Carl Zeiss Planar 85mm f1.4, Minolta MD 35mm f1.8, Konica 135mm f2.5, Minolta MD 50mm f1.2, Minolta MD 250mm f5.6, Carl Zeiss Sonnar 180mm f2.8
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thePiRaTE!!
Joined: 31 Oct 2008 Posts: 416 Location: Canada
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Posted: Wed Apr 15, 2009 1:18 pm Post subject: |
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thePiRaTE!! wrote:
Attila wrote: |
Don't risk this lens! |
I'm cautious and patient. I'm not worried about the result Once I'm finished, both lenses will be cleaner and have smooth operating helicals. When I received my second copy, the helical was so tight it would turn itself off my screw adapter before it would rotate, but now it glides with ease. The last person in there used bad grease and way too much of it.
Since I was bored, I just snapped a pic of the (now clean) helical ring part. As above, the ring shown beside the lens is from the M42 version and fits both lenses and receives either mount cap. The ring on the Exa one only fits on the Exa lens and only takes the Exa mount cap. My mind hasn't gotten around how this is possible...
On the lens
_________________ kellysereda.com
Sony A7ii, A900, NEX-5
_______________________
Helios: 1.5/85 40-2.
Meyer-Optik: Trioplan 2.8/100, Oreston 1.8/50.
Minolta: Rokkor-PG 1.2/58.
Porst: 1.2/55 Color Reflex.
Sony: 4-5.6/70-400 G.
Takumar: Super Takumar 3.5/135, Super Takumar 1.4/50, SMC Takumar 3.5/28.
Topcon: Topcor 1.4/58.
Voigtländer: Nokton Classic SC 1.4/35.
Zeiss: Planar T*1.2/85 "60 jahre" C/Y, Vario-Sonnar T*3.4/35-70 C/Y, Vario-Sonnar T*2.8/16-35 ZA, Distagon T*2/24 ZA.
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Binyo
Joined: 08 Mar 2010 Posts: 3
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Posted: Wed Apr 27, 2011 12:13 pm Post subject: |
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Binyo wrote:
nice |
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