I have the Pancake I (which is optically identical to the Classic) and the Ultron. The most obvious difference is speed. The Ultron is low in contrast whereas the Classic is high. Both take 39mm filters. The Ultron is nowhere near as big as you read, I don't know where people get that idea. Both are excellent lenses but the Ultron only focuses to 0.9M whereas the Classic goes down to 0.7M. I find the Ultron not the easiest lens to focus as the scalloping on the focusing ring is a little shallow.
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