FAQ Adapters: M42 Not StraightUpdated 2 years ago

Lens not being ‘upright’ on the camera

The inner ring of our M42 adapters does rotate to allow the lenses from various manufacturers (not all of them ‘stop’ at the same point) to sit ‘upright’ when mounted on the adapter, the ring is normally clamped down using 3 set screws around the outer ring (3 tiny holes, see attached image).

Over time these set screws work their way loose during numerous lenses being mounted and unmounted, they just need to be tightened back up every so often. If you know your lenses always stop at the same ‘upright’ point, you can use a thread-locking fluid on the set screws to help prevent them from getting loose in the future.

The tool to use is the 1.5 mm Allen wrench https://www.amazon.com/Wiha-35392-Piece-L-Key-Metric/dp/B001ATKWJY