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Nice pictures BIF, but the Zuiko is actually significantly bigger than the Pentax M* and A*, and the Zuiko is f/4.5 whereas the Pentax is f/4. Normally Zuikos are small marvels, but not in this case. It is actually only a little smaller than the Canon nFD 300 f/4 and given that it is a slower lens the small improvement in size isn't very impressive. Here are the relevant sizes weight: Pentax 825g, Zuiko 1000g, Canon 1060g: length: Pentax 13.2 cm, Zuiko 18.1 cm, Canon 20.7 cm.
Lightest Weight, Highest Quality, 300mm, In this case that spells Zuiko.
I have the Canon FDn 4.0L and a bunch of other 300's too. The 300/4.0L has a no CA WO where the Zuiko has some at it's widest aperture. The Zuiko renders colors much richer and more true to the scene than the FDn 300/4.0L though. And of course the Zuiko is very compact and light weight. I think the Zuiko the lightest most compact 300 I own which still has a tripod collar on it. Removing the tripod collar lightens it up even more. The Zuiko is...Show more →