salty said:
but i cant help thinking i will have to spend more than expected on a IS lens to get those results im after.
OK - one more time..!
Exactly what results are you after, Richie?
I know you mention "flight shots" and "record shots", but are there any specific shots in the gallery that have made you say "wish I'd taken that"?
Something else to bear in mind. While it's true that you can never have enough reach, there's another way of looking at things: I use 400mm, and I've realised that for me it's plenty, because I've decided to accept that if a bird's too far away, it's too far away.
End of story, no pining over extra reach.
The thing is, if you've got 500mm, you'll wish you had 600mm: if you have 600mm, you'll be hankering after 800mm,
unless you make the effort to accept that you won't always get frame-filling shots (and so what? Sometimes it's nice to see more of the bird than the reflection in its eye!)
IS isn't the be-all and end-all (I knew that before buying my new lens, but I hoped that it might help me progress a bit), and there are scads and scads of excellent shots in the gallery that didn't involve a tripod or image stabilisation.
So: what are you really trying to achieve?
It's a shame I didn't know you were heading north today - I could have have talked to you about all this in person. Even though I'm no expert, I've got a fair idea about the right kinds of question to ask.