Andy Hall wrote:
On 2008-07-21 14:45:29 +0100, "Mike....."
said:

Following up to John Rumm

I know. I was thinking about perhaps using the 300mm plus a 1.7
teleconverter with a DX. In principle that should be reasonable
although not quite as good as a prime. This has the advantage of
being
somewhat less massive than the 500mm, both on weight and price.

Problem with many of the converters is loss of light... if you are
already losing a few stops through a long lens.

the Sigma 500mm f4.5 would be nice, not as big as the f4s, if its not too
much money

That one's in the £2500 region, which is admittedly half the price of
the Nikon 500 f4. Like a lot of 3rd party lenses, it does lose a bit
at the ends, I'm told, so practically, it is probably only good to f5.6
That could be a problem wih lower light levels and/or higher shutter
speeds


Opps. I was talking about the 400/5.6..not the 500/4.5..old age..

4.5 outside credit card limits :-)

Still if I ever see an old but good 500/600mm F4 and a bit Nikon, AIS or
later, I will probably find a way..