Following the request of
Hin and OregonJim, I create a new topic on the lens conversion to PK mount. Hope it will be useful for the others who interest the lenses conversion. If it is not convenient in this section, mod or admin, please, move it to the convenient place.
Firstly, I introduce the conversion of
Vivitar 70-210 S1, version 3 KONICA mount to Pentax K. Following Marks Robert, this one is the best among three versions.
The flange focale distance of Konica system is about 40,5mm, whereas the Pentax one is 45.5mm. Therefore, we must shave the lens about 5mm in order to focus to the infinity.
Here is the image of the lens before the conversion (sorry, because it from the seller)
Required things:
- An adapter M42-PK ~ 6$ (I bought from a seller on ebay)
- Some small screwdrivers
- A ruler
- A saw (A lathe will be better)
- A drilling machine
This conversion simply consists of two steps. Firstly, cut off 5mm and secondly replace the Konica mount by the M42-PK adapter.
1) Disassembling the lens and cutting away 5mm
Unscrew 4 cross-screws from the bottom of the lens to take out the Konica mount.
The M42-PK adapter is thinner than the Konica mount about 1mm. Therefore we must shave the other parts of the lens about 4mm.
This ring is associated with the aperture system of the lens by the trigger. I decided to shave the aluminum ring. Firstly, I sawed this ring, cut away 4mm. This ring screws on other part of the lens which has the thread as the image shown.
Secondly, I also sawed this part about 4mm as the below image. After that, I filed them, it would be better if I had a lathe instead of sawing.
The trigger were also cut away about 4mm in order to function correctly.