Jordan Langmore Posted April 14, 2022 Posted April 14, 2022 I recently purchased a Kern Switar 10mm f1.4 lens, which appears to be in good condition, for use on my Bolex EBM with a c mount adapter. However, when mounting this lens I encountered a strange problem where it would only focus at extremely close distances and leaves the rest out of focus. Seems like this lens is not in such great shape after all but wondering if anyone knows a fix? Thanks for any help!
Premium Member Simon Wyss Posted April 14, 2022 Premium Member Posted April 14, 2022 Is there an extension ring left on the rear of the lens? That would explain the matter.
Premium Member Dom Jaeger Posted April 15, 2022 Premium Member Posted April 15, 2022 Assuming you mean 10mm f/1.6 not f/1.4.. If it only focusses at macro distances, then the lens is sitting too far away from the film plane, so first thing is to check if it is properly screwed all the way in to the adapter and the adapter is properly seating in the camera mount (and of course the right way around, extending in towards the camera and not away from it).
Doug Palmer Posted April 15, 2022 Posted April 15, 2022 Does the focusing ring turn freely all the way like it should ? And callibration...numbers tally with short distances ?
Doug Palmer Posted April 18, 2022 Posted April 18, 2022 Another thought... presumably your lens isn't one meant for the H8 ? C-mount but different focus.
David Lozano Posted May 6, 2024 Posted May 6, 2024 Hi Jordan! I have a 10mm 1.6 switar and this is also happening to me. It focus on extreme close up and not infinity. Did you manage to solve it?
Ben Marshall Posted May 7, 2024 Posted May 7, 2024 Silly check: check that you are using the SBM>C-mount the correct way round (inwards, not outwards).
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