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Kathmandu
Joined: 09 Dec 2009
Posts: 1479
Location: (Kathmandu,Nepal. Currently)Pacific Northwest, USA
Expire: 2012-04-08
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 Posted: Fri Sep 10, 2010 6:15 am Post subject: Exakta mount and Miranda mount lens and planned adaptation. |
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Kathmandu wrote:
I have in the past adapted T-mount Exakta lenses as it was just a swap of T-mount lenses and adjusting for infinity. Some did prove challenging-a Sankyo Kohki Japan Komura 200 f3.5 in particular .
This time I have been collecting some lenses over the past month~
A Spectra Coligon 135mm f2.8 (in Exakta mount), Spiratone 135mm f2.8(which I bought on Ebay which I thought was M42 but turned out to be a Miranda 44mm screwmount.) A Sankyo Koki Tokyo Komura 200mm f3.5, and a Sankyo Koki Tokyo Komura 105mm f3.5 both in Exakta mount.
The inner diameter of the Spectra Coligon and Spiratone lens mount was 50mm which is a larger than the T-mount adapter's-that is after you remove the inner ring. The Koki Komura's lens mount screws on to a 46mm threaded mounting boss.
I bought 3 Minolta AF(Sony AF) T-mount adapters and had a took the inner rings out. I then had my friend machine the inner diameters to 50mm and 46mm respectively. I also had him machine of 2mm from inside the roof of the mount.
I will be disassembling the Coligon and Spiratone lenses as I need to shave the mounting bosses of these 2 lenses. 1.5mm off the Coligon and 3mm off the Spiratone-to achieve infinity with my modification.
The Sankyo Koki Tokyo Komura 105mm f3.5 has been adapted-all I had to do was screw the newly modified T-mount with tree set screws on the side .
The Adapted Koki Tokyo Komura 105mm f3.5 is the one the right-with the exakta mount I took off it- in front of it. Infinity has been achieved on this modification.
From left to right: Spectra Coligon 135mm f2.8 in Exakta mount, Spiratone 135mm f2.8 in Miranda mount, Sankyo Koki Tokyo Komura 200mm f2.3 in exakta mount, and Sankyo Koki Tokyo Komura 105mm f3.5 in newly adapted Minolta AF T-mount.
Freshly modified Minolta AF(Sony AF) T-Mount.
the 4 candidates
I have had a soft spot for Komura Lenses-
From the left Sankyo Koki Tokyo Komura 105mm f3.5 adapted for Sony AF, Sankyo Koki Tokyo Komura 200mm f3.5 in Exakta mount, Sankyo Kohki Japan Komura 200mm f3.5 adapted for Sony AF, and Sankyo Kohki Japan Komura 105mm f2.5 in Sony AF mount.
Individual lenses:
[i]Sankyo Kohki Japan Komura 200mm f3.5
Sankyo Kohki Japan Komura 105mm f2.5
Sankyo Koki Tokyo Komura 200mm f3.5
Sankyo Koki Tokyo Komura 105mm f3.5
Spectra Coligon 135mm f2.8
Spiratone 135mm f2.8
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Kathmandu
Joined: 09 Dec 2009
Posts: 1479
Location: (Kathmandu,Nepal. Currently)Pacific Northwest, USA
Expire: 2012-04-08
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| Posted: Sat Sep 11, 2010 6:20 am Post subject: |
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Kathmandu wrote:
Closer look at the new T-Mount.
Increased the depth here by 2mm, max allowable on this mount-leaving about 1and 1/2 mm thickness for the mount plate..
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walter g
Joined: 20 Feb 2010
Posts: 2463
Location: NC, USA
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| Posted: Sat Sep 11, 2010 7:59 am Post subject: |
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walter g wrote:
Beautiful lenses, and really nice work. A vertical mill and a small lathe are both on my to buy list as soon as I can get the money together.
_________________
Main cameras
Panasonic G5,Nikon J1,Pentax Q10,Sony Nex 6
Minolta MC W SI 2.5/28, MD 2.8/28, MC W SG 3.5/28, MC Celtic 3.5/28, MC W HG 2.8/35, MD Celtic 2.8/35, QE 4/35, Rokkor X 2/45, MC Rokkor X PG 1.4/50, MC Rokkor X PG 1.7/50, MD Rokkor X 1.7/50, MD 2/50, MC Rokkor PF 1.7/55, MC Rokkor PF 1.9/55, Auto Tele Rokkor PG 2.8/135, MC Tele Rokkor QD 3.5/135, TC 4/135, MC Celtic 4/200, MC Tele Rokkor PE 4.5/200
MD 28-70 f3.5-4.8, MD Macro 35-70 f3.5, Md 70-210 f4, MD Rokkor X 75-200 f4.5, MD 100-200 f5.6
Nikon Nikkor 4/20, O Auto 2/35, S Auto 1.4/50..... Miranda Auto 2.8/28, Auto 2.8/35, Auto 1.4/50, Auto EC 1.4/50, Auto 1.8/50, Auto EC 1.8/50,Auto 1.9/50, Auto 3.5/135
Various Soligor,Sun,Fujita,Komura,Spitatone, etc. Lenses
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Kathmandu
Joined: 09 Dec 2009
Posts: 1479
Location: (Kathmandu,Nepal. Currently)Pacific Northwest, USA
Expire: 2012-04-08
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| Posted: Sat Sep 11, 2010 10:38 pm Post subject: |
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Kathmandu wrote:
Thanks and Good luck on your "small lathe"  , I have been imposing on a friend to do the modifications for me-he has great skills with the lathe. I have to catch him on the right days . |
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walter g
Joined: 20 Feb 2010
Posts: 2463
Location: NC, USA
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| Posted: Sun Sep 12, 2010 3:29 am Post subject: |
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walter g wrote:
Your lucky. Theres no one near by that has a lathe. So I need to buy my own.
Probably get a used one for well under half the price of the one in the link below.
http://www.harborfreight.com/7-inch-x-10-inch-precision-mini-lathe-93212.html
_________________
Main cameras
Panasonic G5,Nikon J1,Pentax Q10,Sony Nex 6
Minolta MC W SI 2.5/28, MD 2.8/28, MC W SG 3.5/28, MC Celtic 3.5/28, MC W HG 2.8/35, MD Celtic 2.8/35, QE 4/35, Rokkor X 2/45, MC Rokkor X PG 1.4/50, MC Rokkor X PG 1.7/50, MD Rokkor X 1.7/50, MD 2/50, MC Rokkor PF 1.7/55, MC Rokkor PF 1.9/55, Auto Tele Rokkor PG 2.8/135, MC Tele Rokkor QD 3.5/135, TC 4/135, MC Celtic 4/200, MC Tele Rokkor PE 4.5/200
MD 28-70 f3.5-4.8, MD Macro 35-70 f3.5, Md 70-210 f4, MD Rokkor X 75-200 f4.5, MD 100-200 f5.6
Nikon Nikkor 4/20, O Auto 2/35, S Auto 1.4/50..... Miranda Auto 2.8/28, Auto 2.8/35, Auto 1.4/50, Auto EC 1.4/50, Auto 1.8/50, Auto EC 1.8/50,Auto 1.9/50, Auto 3.5/135
Various Soligor,Sun,Fujita,Komura,Spitatone, etc. Lenses
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Kathmandu
Joined: 09 Dec 2009
Posts: 1479
Location: (Kathmandu,Nepal. Currently)Pacific Northwest, USA
Expire: 2012-04-08
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| Posted: Sun Sep 12, 2010 4:58 am Post subject: |
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Kathmandu wrote:
Wow that looks perfect-and the size -you could fit that anywhere. I read the manual and looks perfect for mount fabrication and modification. . |
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walter g
Joined: 20 Feb 2010
Posts: 2463
Location: NC, USA
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| Posted: Sun Sep 12, 2010 5:07 am Post subject: |
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walter g wrote:
The same lathe is sold by a bunch of different companies. I haven't checked for the cheapest price yet, but I'm pretty sure that's what I'm getting.
_________________
Main cameras
Panasonic G5,Nikon J1,Pentax Q10,Sony Nex 6
Minolta MC W SI 2.5/28, MD 2.8/28, MC W SG 3.5/28, MC Celtic 3.5/28, MC W HG 2.8/35, MD Celtic 2.8/35, QE 4/35, Rokkor X 2/45, MC Rokkor X PG 1.4/50, MC Rokkor X PG 1.7/50, MD Rokkor X 1.7/50, MD 2/50, MC Rokkor PF 1.7/55, MC Rokkor PF 1.9/55, Auto Tele Rokkor PG 2.8/135, MC Tele Rokkor QD 3.5/135, TC 4/135, MC Celtic 4/200, MC Tele Rokkor PE 4.5/200
MD 28-70 f3.5-4.8, MD Macro 35-70 f3.5, Md 70-210 f4, MD Rokkor X 75-200 f4.5, MD 100-200 f5.6
Nikon Nikkor 4/20, O Auto 2/35, S Auto 1.4/50..... Miranda Auto 2.8/28, Auto 2.8/35, Auto 1.4/50, Auto EC 1.4/50, Auto 1.8/50, Auto EC 1.8/50,Auto 1.9/50, Auto 3.5/135
Various Soligor,Sun,Fujita,Komura,Spitatone, etc. Lenses
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