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RE: [OM] Fish-Eye on the cheap

Subject: RE: [OM] Fish-Eye on the cheap
From: Thomas Bryhn <thomas.bryhn@xxxxxxxxxx>
Date: Sun, 05 Aug 2001 14:51:34 +0200
At 20:55 04.08.01 -0400, you wrote:
I was afraid there would be problems with an adapter. Oh well, was
worth a try ;-|

GeoW

Dont't give up yet! The reason there is no OM-adapter available is probably that there is no room for a lens release button. The other camera brands have the button on the housings, so there is no problem. I've got a Zenitar 16/2.8, originally in Pen*ax K-mount. I took the mount off and replaced it with one from a discarded Zuiko 50/1.8 (yes, it was already dead, so I thought of it like an organ transplant...). It required a little sanding to get the mount thickness right, but it was definetely worth the time spent. The diaphragm was automatic, but a spring from a pen make it permanently stopped down. This leaves two problems, or rather "issues": 1. There still is no room for a lens release button. The lens still fits my cameras and stays in place, so I don't care. 2. Spot metering have to be done at full opening to get correct values, and f/2.8 in bright sunlight will frequently give shutter speeds over 1/2000 with all but the slowest films. Spot metering with a 16mm fisheye is a joke anyway, so I usually use a normal or short tele lens for metering and transfer the settings to another camera with the fisheye mounted.

Back to the lens in question: the first picture clearly shows the M42 mount, and it has three screws clamping the mount to a flange inside. You can use a common T2-adapter for OM, loosen the 3 or 4 screws around the inner ring, and substitute the outer part for the M42 mount. In other words, the Peleng sells with what can best be described as "half a T2 mount for M42", and it can probably be replaced. I've done this with a russian MTO 1100mm f/10.5, and the mounting shown looks exactly the same. This way you also get a lens release button!

Regards,
Thomas Bryhn


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