When I was carrying 55-250, I found It way short for birding, Then after almost two years I took 400mm F5.6, but man even with this, the birds like prinia are way far to fill the frame... and then crop is unavoidable.....
30D with 400mm
TV-1/800
ISO- 400
AV- 5.6
Sharpening & noice reduction....
Monopod Support
Heavy Crop
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