I have a 240mm for my film Hasselblads, and I often find that my 50-110 zoom is not long enough, so the nice man from Hasselblad (Hi, David) is bringing a 300mm for me to try...
... the question is, what would I use it for?
Landscapes have always inspired wide-angle mania in most photographers, but I prefer tele landscapes, and I would use the 300 for landscapes and townscapes, with or without a pano-head.
300mm is long for portraiture, but, I think ideal for (wedding) speeches, if you want a "bust" or half-length shot from a distance, and also for candids etc.
With a good hide, or remote control you could use a 300mm for wildlife... (at Port Isaac there is a wall between the path and the cliff, so you can get very close to nesting seagulls).
Would the digital 300 be an order of magnitude better than the film 240?
With the adaptor you have to manually cock the shutter, which would not be ideal, and would not work for remote pano head work on my 10m tripod.
Outside my hose there is a scene where you can see brickwork at various ranges up to 500m, and this would be a good test shot.
I will be testing it on the H3D11-50, but I looking ahead to having the H4d-60.
I had an open cholecystectomy (gall bladder) on 27/6/2010, and I hope that this will, in a few weeks, make me well enough to get out and use my camera.