Quote:
Originally Posted by ray
Well i have made my mind up now im staying as i am, i take a lot of shots at bird tables so im fine, if i ever wanted to frequent the bird hides on marshes and lakes then i would have to re-consider 
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A wise choice I think. Even with a 600 mm lens that small dot you get with your 300mm will only become a twice as large dot. I tried digiscoping a while ago and was working with something the equivalent of 2400 mm. Even then from half way across a lake the birds were still quite small in the frame and the quality was not much good.