Pretty curious how this turned out, the buyer was gracious enough to respond:
Hi - I don't mean to be nosey, but I am very curious about the Canon
400mm lens you've just bought, it was an object of much speculation -
would you tell me if there are problems with it, other than cosmetic? Do
you intend to use it as is, or will you have it rebuilt? Just curious.
Thanks
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It was in decent shape. The seller was a newspaper staffer and very
pleasant to deal with. It does not need rebuilding but the focusing
mechanism needs some work ... whether just something to keep the
group fixed in place or a whole new focusing unit, I don't know. That
problem precludes using TCs for the most part, although without TCs
it takes very nice photos (just shot a kids soccer game ... nice!).
The
body mount works but has a little too much play to suit me. The
hood's mounting flanges are hosed and will make a nice project for
someone at a machine shop later on in AK (hopefully working for
trade). Meanwhile I have a very nice $3 hood made from a
plastic nursery pot and some adhesive backed foam weatherstriping.
Fits like magic. All in all though the lens was a great deal, even if
it winds up needing a whole new focuser.
The cosmetics aren't all that bad really. Just looks well worn. Fine
by me because it is likely to be exposed to the Great Outdoors and
put down on the ground or gravel or rocks .... Lot more convenient
than having to carry a big tarp/blanket/whatever; I can just carry a
little tarp/blanket/whatever for the shiny lenses.