Curious your view on either combination?Yesterday I got some stellar photos of a Mississippi Kite with the Panasonic G9 and PL 100-400. This morning, he was there again, and I tried the E-M5 Mark III with the PL 100-400. Unfortunately, I only got three shots before he flew off, and I did not get as close, but here is one at 140%. The sun is just over the horizon at his back.
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Having never been there, this shot is deceiving at first glance, at least for me. I think the streetlights on the left trick the eye that the courtyard below is much smaller than it actually is. However, the benches in the courtyard below instantly snap the viewer back to reality by providing scale.