I’d need to create the clips to hold the entire thing tightly against the lens adapter without allowing it to shift. The lens panel wasn’t made to be placed against a lens adapter, obviously. The big problem with this approach would be light leaks. My choices were to fashion a type of bracket that would secure the lens panel to the NEX adapter. My next challenge was figuring out how to attach it to the adapter. The one that worked was for the Leica M mount, and it cost me less than $8 with free shipping. Luckily, these adapters are plentiful and inexpensive on eBay. (Caution: When you use a Dremel, wear protective eye gear and put the piece into a vice, because it can become very hot.)Īfter cleaning the lens and relubricating the helicals, it was time to figure out a way to mount it to an NEX-mount adapter. I finished with a file and fine sandpaper. There was a protrusion on the rear of the panel, but a few minutes with a Dremel and a cutting disk took care of that. I also had to remove a long rod that trips the shutter. My only choice was to keep the lens panel. There wasn’t an easy or obvious way to remove the rear element and have an aperture assembly. With the Pentona, the rear element and aperture blades (five of them) are part of the lens panel. When I removed the front of the shutter housing, the two blades that comprise the shutter fell out. Obviously, for this to work, I was going to have to keep the shutter open at all times. Both are integral to the front panel of the camera. Here’s the problem: the lens and shutter aren’t contained in a single unit, like they are in many cameras. My first task was to remove the lens and shutter assembly. How difficult would it be to attach the lens from this camera to my Sony NEX-7? That’s what I set out to learn. It's a triplet, as the name Trioplan indicates. The Pentona, a simple viewfinder camera, was available in the mid-1950s. The Trioplan first appeared in 1916. However, I do own a non-working Pentacon Pentona camera that is fitted with a coated f/3.5 45mm Trioplan. The problem is that I don’t have a Trioplan in an interchangeable lens mount. With the recent interest in the Meyer-Optik Goerlitz Trioplan, I decided it was time to try this lens for myself. One of the great things about mirrorless interchangeable-lens cameras is the ease with which you can attach lenses from the film era.
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