When I think about difference between Moon Picture by P-type and Picture by TS-80, Clearly, lens company adopted different lens ( at least ) 1.for front lens.
Also, P-type is F7.7, but color aberration is too small................

This is only my imagination, when use front lens of TS-80 for P-type , (at least) color aberration problem can't be cleared .request
from Takahashi seisakusyo.

So, lens company ( polishing, coating) couldn't but do changing lens to other lens........................

However, it's new lens, coating would be very very difficult, I imagine a lot of effort were needed for it.
Yes. the Affinity between it's lens and coating the company had must be bad...................

In such reason, the company did something which was for protecting front lens.....Like a piece of oil.....


This is only my Postulate.

Anyway, P-type released 1973 year. ( 38 years ago), too long time has passed.

From my opinion, for P-type , we required perfect will be cruel. Everything has fault. ( same as human).

There will be nothing which is perfect in the world.........................


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By the way, for my revived P-type 's front lens, I did simple coating to protect front lens. ( of course, not coating used for recent high quality refractors.


For all lens, ( there is exception) must be coated by all means.


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Lens maintenance is a piece of fight with coating.
In case of me, most difficult coating was PENTAX's SMC coating, and Takahashi (F) type 's coating.

Very difficult, but when I did it, the sense of accomplishment are always ; I cannot compare it elsewhere..................


27/ August in 2021

koji