Quoted message said:Interesting - I got a zoom that goes to 300mm for my SLR recently and
found that just resting on the top of an extended walking pole acted
perfectly satisfactorily as a monopod.
Actually screwing it to the top makes a big difference to stability.
Quoted message said:There will always be a market
for specialised items I suppose, and it may well be that for an even
longer zoom a screwed in mount is necessary
It's not a question of how long your zoom is, it's a question of how short
your shutter speed. The more stable your monopod (screwed to the camera,
jammed into the earth) the slower the shutter speeds you can use.
With a wide angle lens, a short monopod, and very careful bracing against my
body, I've managed to get sharp shots as long as 1 second, but I wouldn't
recommend going below 1/15th at full length, and that's with a wide-angle.
You might be able to get away with 1/125th with a 300mm if you're careful,
but for long zooms I always recommend a bean bag on a rock.
Paul