Originally Posted by
LabRat
It is fortunate that the barrel has a seat larger than the threaded area below it, because there is a good solution if the flange is missing...
You can bore out a lensboard where the hole is just slightly larger than the threads, and draw out a hole circle that is larger than the seat, and lay out space for 3 or 4 bolt holes on the lensboard that have spacers that allow them to fit close (barely touching) around the lens barrel, but allow a washer or custom block to go over the top of the bolts and hold down the seat area... (These retain the lens from falling off the board...) There can be spacer tubes with washers, nuts with washers, or a carved block that fits into the radius of the seat... This works well with several barrel lenses I have mounted that didn't have a flange... (Think of it like the lugs that hold your tire rim to your car, but just hold the outside edge of the lens to the board...)
One thing to note is if the internal F/S area behind the lensboard has room inside for the heads of the bolts that then extend to the front of board, but you can also countersink the heads for more clearance inside...
Good Luck!!!
Steve K
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