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420mm (300mm + 1.4x teleconverter) and the photo's are cropped as well, the birds were probably between 3.5m and 5m away
Edit - I have also realised that taking good photo's of birds is pay to play, I can do OK in good light but often out at dusk given time of year or in shade in woods and my photos get noisy and lose detail quickly. Am hunting online for a decent second hand deal but good glass is expensive and more than I want to pay really. I have a Pentax for my sins and there are limited options for fast telephoto lenses compared to Canon and Nikon which doesn't help. So I am stuck at the moment just trying to physically get closer.
What sort of focal length are you using to capture these? I never seem to get close enough to catch that sort of detail.