Henchman Posted May 7, 2021 Share Posted May 7, 2021 I have 2 Voigtlander Ultron 40mm f/2 SL II Lenses. One is EF one is Nikon. For some reason the EF will not focus with my BMPCC 4k. I've tried both a speedbooster and passive adapter. What could the problem be? Quote Link to comment Share on other sites More sharing options...
Super Members BTM_Pix Posted May 7, 2021 Super Members Share Posted May 7, 2021 10 hours ago, Henchman said: I have 2 Voigtlander Ultron 40mm f/2 SL II Lenses. One is EF one is Nikon. For some reason the EF will not focus with my BMPCC 4k. I've tried both a speedbooster and passive adapter. What could the problem be? Do you have a Nikon to EF adapter to see if that then causes the same issue with the Nikon version ? Quote Link to comment Share on other sites More sharing options...
Henchman Posted May 9, 2021 Author Share Posted May 9, 2021 On 5/7/2021 at 4:11 AM, BTM_Pix said: Do you have a Nikon to EF adapter to see if that then causes the same issue with the Nikon version ? I actually had a friend try it on his canon. Same issue Quote Link to comment Share on other sites More sharing options...
jase Posted May 9, 2021 Share Posted May 9, 2021 If i dont misunderstand you completely then you are believing that your Ultron has AF? it does not. Quote Link to comment Share on other sites More sharing options...
Henchman Posted May 10, 2021 Author Share Posted May 10, 2021 On 5/7/2021 at 4:11 AM, BTM_Pix said: Fixed it. It was the helicoid not being assembled correctly. I had to disassemble the entire lens and Re-insert the helicoid at a different start position. Took a couple of frustrating hours of trial and error. But now it's tack sharp. And I saved myself $250 BTM_Pix 1 Quote Link to comment Share on other sites More sharing options...
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