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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.
They didn't stay still long but were only bouncing around in a small area so was easy to keep up with them, there were some today at a different site and I didn't get a single photo as they were way to fast