[Rainer]

[quote name='PuxaVida' date='10 July 2010 - 01:22 PM' timestamp='1278760976' post='936']

Screw mount adapters for M42 lenses (like Tair or Jupiter) are very convenient for Pentax (K mount) users.

But Canon's and especially Nikon's register index does not fit to this mount.

[/quote]



Actually those are the register distances ...



Canon EOS/EF registers at 44.0mm

M42 registers at 45.5mm

Pentax-K registers at 45.5mm

Nikon-F registers at 46.5mm



So, everything can be adapted to EOS/EF without a problem (and without an additional lens in the adapter)

Nothhing can be adapted to Nikon.