I completed the Leitax conversion of my Zeiss ZF 35mm f/1.4 from Nikon to Pentax K mount.
The lens mount is attached with what Leitax calls "long screws". The following Zeiss lenses also have these long screws: 25/2, 35/2, 100/2 and 135/2.
I have already converted the 35/2 and 100/2 Zeiss lenses. While they do require the special long screws, their aperture ring is still "one piece". So, the Leitax conversion on the 35/2 and 100/2 are fairly straight forward and very similar to doing a Zeiss Leitax conversion on a lens that uses the "short" lens mount screws.
Having converted a number of Zeiss ZF lenses already, I was surprised at what I found when converting the Zeiss ZF 35/1.4 lens. This is the only Zeiss ZF lens that I have worked on that has what I would describe as a "
TWO PART" aperture ring. When I removed the "outer" aperture ring, the inner aperture ring just sort of came along for the ride. After this "inner" aperture ring came off, a couple of other parts came tumbling out too! For a second I was not sure that I was going to be able to put it all back together again properly. Lucky for me, after a bit of trial and error, I was able to properly replace both of the aperture rings and the other assorted parts that came out with them.
So, my advice to you would be Zeiss ZF 35/1.4 converters, "be very careful when removing the aperture ring. Make sure that you only remove the outer ring and leave the inner ring in place thoughout the entire conversion process (there is no need for it to be removed). You may need a small knife to wedge between the two aperture rings (see photo below) to assist you with removing only the "outer" ring. Also, be aware that there is a "spring" under the inner ring that pushes it off of the lens - so the inner ring's natural tendancy is to come off of the lens along with the outer ring.
Please note that I have not yet converted the Zeiss ZF 25/2 or 135/2 lenses (although I expect I will be doing one of them in the near future). I do not know if these two lenses have a two-part or a one-part aperture ring.
Last edited by Fenwoodian; 12-23-2017 at 12:14 PM.