Pentaximus!
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Click on any photo to see a larger version

To see how the round holes were cut, see
this page.
I came across several of the longer lenses over time
and have added them to the collection. First was a 200mm and then a
extremely clean 300mm. The piece de resistance was a 500mm I found in
Japan. What a beast, the camera, grip and lens tips the scales at 12
pounds!

There's a tripod foot on the bottom for a very good reason!!