Fred Miranda wrote: robgo2 wrote:
I made an attempt to get my CV Ultron 35/1.7 to work with the PCX 5m front filter. I tried three different adapters and could not get any to reach infinity focus. Not knowing any means of modifying the lens internally, I decided to have an inexpensive Fotodiox adapter modified instead. I took it to a local machine shop that does very precise custom work. They milled off metal from the front end of the adapter in increments of 0.05mm to a maximum of 0.2mm, at which point I could focus at infinity.
But all is not well. By making the adapter thinner, the attachment to the lens is looser, and the lens wobbles slightly as I try to focus it. The only way to achieve consistency is to press the lens into the camera body throughout the focusing and taking processes. Not good. Nevertheless, I was able to run a brief comparison of the front filter modified Ultron and ZM 35. The ZM images look so much better, at least with the setup that I have described. Moreover, the Ultron displays the same characteristics that always bothered me--heavy vignetting and color shifting along the edges.
At this point, the discussion is over for me. ZM with PCS 5m it will be. If others can find a better solution for the Ultron, I will consider it.
Rob
You can't shave the front metal section of the adapter. That thickness is needed to securely mount the adapter in place and making it thinner will create mounting issues. (it may get wobbly)
It's not easy to make an adapter thinner. You need to remove the front end metal and shave the area where it sits on. Ask your shop if that's is possible for them to do that.
