Hi Hans:
<< - - Some 3rd party tubes have a fourth OM-3/4 spot reset unfriendly
screw in
their mount . . . I have a set of Kenko tubes that have three screws. >>
My 1978 era (as per the instruction sheet) Vivitar Extension Tube set
has 3 screws on the mounting flange. Vivitar probably had different
suppliers over the years. No wonder Vivitar spec sheets frequently say
"subject to change."
Gary Reese
Las Vegas, NV
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