Alan Chan http://www.pbase.com/wlachan
I've just picked up an old (but looks as good as new) Tamron SP 300mm f5.6 (Adaptall 2 mount), for use on my *ist D. I'm surprised at how small and light this lens is, and I'm thinking of adding it to my general walking-around kit. But that would be easier without its relatively large, removeable tripod mount.
The lens is too heavy to weigh with our kitchen scale, but using our digital bathroom scale (weighing myself both with and without the lens, and subtracting one from the other to get the weight of the lens), it seems to weigh about 21 ounces (~595g) (including the Adaptall 2 mount, but not including the tripod mount), give or take about 2 ounces (~56g). The length is about 169mm including the Adaptall 2 mount.
Is that too much weight and length to put on the *ist D, with the *ist D mounted on a tripod?
This lens seems barely heavier than my Tamron 90/2.5 macro (also too heavy for our kitchen scale), which doesn't have a tripod mount, but then the 300 is more than twice as long as the 90, which I realize would make a difference in stressing the camera's lens mount.
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