Measurements of a BPM Bellows Mount

The BPM bellows system around in the 70s was a versatile system with mounts to accommodate most camera and lens fittings. But it wasn’t the only one. The likes of Soligor, Hama, Russian, Kenlock and others made similar interchangeable systems, but with their own system of mounts. Im not sure which are interchangeable between bellows […]

Stepping rings save you money

Stepping rings are really useful additions to your filter collection. They are slim rings that have a male thread on one side and a female thread of a different size on the other. They are designed to allow a filter with one diameter be used on a lens with a different diameter. Stepping rings come […]