My understanding is that Alpa had the shortest lens to film plane distance, there were lots of adaptors for Alpa lens to other bodies, and I am sure a M42 mm to Alpa adpator was made, but it may required a glass correction lens. The Kern Swiss is said to be one of, if not the Sharpist normal lens ever made for 35mm.
Thanks. By the way, what is a glass correction lens? I haven't heard the term. Ahhh, the Kern Swiss... it's hard not to hear about the virtues of that lens. Unfortunately it has a price to match its reputation. I'm looking for a modest lens at this point. My wife is not overly fond of my combined Leica, Hasselblad, and Rolleiflex collection. It would be nice to hear if anyone has had good results with the more modestly-priced Alpa lenses.
The Alpa flange distance was 37.8mm. This means most SLR lenses adapted to the Alpa (Nikon, Leica, etc) will need a mechanical adapter only. To use an Alpa lens on (for instance) an M42 body (45.46mm flange) would require optics to focus at infinity, making the Kern lens into a fuzzy-wuzzy.
Here is a chart of flange/filmplane distances: http://www.graphics.cornell.edu/~westin/misc/mounts-by-register.html
All of this is quite fascinating. I had no idea the Autobag version is so useful and differs from the Manual Adapter. I'm also curious whether the Alpa lens mount has stayed of the same design over time. For example, would a Alpa mount lens built 30 years prior to the 10d couple correctly with the 10d.
Michael
I was very tempted to buy an Alpa so I looked into the differnt models and and lenses. From what I gather the mount has not changned, later lens are fitted with a coupling that linkns the shutter to the diapharm to stop down the lens. Some of the lens I looked at on Ebay did not appear to have the coupling and appear be stopped down. Even these lens are really pricy, a 500 Mm is over $5000. Which is why I passed.
How do you tell if the coupling is there or not?
The coupling extends beyound the barrel of the lens, rather large, fits over the shutter relase so when you press the shutter release the coupling stops down the lens at the same time. I recall that the 10 used stopped down metering, the 11E use open metering. In most images I saw on E bay I could see which lens had it or not.
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