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My favourite ~50mm - Cosinon 55/1.4
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PostPosted: Fri May 01, 2015 2:05 pm    Post subject: Reply with quote
There is a simple explanation for it that saves the story coherence: Cosina did not make the body above. Cosina did not make any 1.2/55 M42 lens. It was an early order of one company from another.
See serial of those lenses. COSINON Tomioka only 1000 pieces. Cosina demanded slight adaptation of Tomioka lens outer body look to fit COSINA line of that period.
COSINA of course later developed its own Pentax bayonet 1.2/55mm lens.

Do not forget we just switched from 1.4/55 to 1.2/55. If we add 1.7/55mm we might have to find another supplement explanation.


PostPosted: Fri May 01, 2015 4:55 pm    Post subject: Reply with quote
Pancolart wrote:
There is a simple explanation for it that saves the story coherence: Cosina did not make the body above. Cosina did not make any 1.2/55 M42 lens. It was an early order of one company from another.
See serial of those lenses. COSINON Tomioka only 1000 pieces. Cosina demanded slight adaptation of Tomioka lens outer body look to fit COSINA line of that period.
COSINA of course later developed its own Pentax bayonet 1.2/55mm lens.

Do not forget we just switched from 1.4/55 to 1.2/55. If we add 1.7/55mm we might have to find another supplement explanation.


This explanation can be valid for f1.4 lenses as well, at least for the early all-metal variations.
As for f1.7 lenses - I think we have zero evidences of their relation to Tomioka.


PostPosted: Sat May 02, 2015 8:04 am    Post subject: Reply with quote
dimitrygo wrote:
Pancolart wrote:
There is a simple explanation for it that saves the story coherence: Cosina did not make the body above. Cosina did not make any 1.2/55 M42 lens. It was an early order of one company from another.
See serial of those lenses. COSINON Tomioka only 1000 pieces. Cosina demanded slight adaptation of Tomioka lens outer body look to fit COSINA line of that period.
COSINA of course later developed its own Pentax bayonet 1.2/55mm lens.

Do not forget we just switched from 1.4/55 to 1.2/55. If we add 1.7/55mm we might have to find another supplement explanation.


This explanation can be valid for f1.4 lenses as well, at least for the early all-metal variations.
As for f1.7 lenses - I think we have zero evidences of their relation to Tomioka.


Indeed, solid evidence would only be Tomioka-Chinon signed contract / license of cooperation or Tomioka - Chinon branded 1.7/55mm lens. Funny is, meters / feet principle can also be applied on 1.7/55 M42 lenses.
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