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These are from the last weekend. The regular migrants are already here!
The third one is immature Saffron finch. Some visitors use to call it female Saffron Finch. Both adults are difficult to separate if they are not close to each-other -female is just slightly duller, immature are very different! And the other thing: I have never ever seen before a flocks counting 25-30 immature birds (with no chaperones:))!!! Usually you can see 1-2 pars per trip (in that area) of adults or a family of two adults and 1-2 immature.

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And these are from today: the last two species are from the Zoo (the birds on photos are not an inventory to the zoo). In this case the Cattle Egret is riding Bongo Antelope:).

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Your notes were helpful for me, thanks. I thought, if the Canon is sharper, it might not be as usual as the specification of 600mm at F/6.3 implies?

Thanks for the video. I noticed he said at 600, he stops down to f/8. Do you need to stop down the 100-500 or is f/7.1 sharp enough?
To make it clear, I never did any tests, and I very often shoot on Sony 200-600 with the open aperture, and it works fine for me. I never intentionally stop it down to F/8 just to get more sharpness. If necessary, I add sharpness in post. But it could be also perceived sharpness. Canon looks sharper to me partly because it is F/7.1 but perhaps partly because it has more contrast. Anyway, I guess it just proves that sharpness is not an issue with these two lenses.
 
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Very nice pictures, ISv. I especially like the Cattle Egret riding the Bongo Antelope.
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