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Great thread Peter,
Just to throw in a couple of things...
Unless I missed this elsewhere in the thread. If you have a M42 bellows with countersunk screws holding the lens mounting plate do not attempt to use Super Multicoated or SMC Takumars on the bellows. The aperture lock pin on the lens will fall into the screw head and they are next to impossible to remove without damage.
One of my setups is based on an Olympus Auto-Bellows unit. I made a simple mount adapter out of a 2x converter. This allows me to easily use the Olympus 80 and 135 bellows macro lenses. The Olympus bellows provides focus and extension independently. The Olympus right angle viewer also fits pentax (M & later) cameras perfectly.
cheers
Greg
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