As the morning progressed, I tried a few more things... I got a little braver with slower subjects and tried some slower shutter speeds, etc with results that surprised me. I think the OSS in the 400-800mm might be a tick better than the 200-600mm stabilization, or, the monopod really helped, probably a little of both. I've read some say they thought the lens was sharper at the long end, but I'm finding this copy pretty consistent throughout the range and it's more about keeping the glass from fogging or heat shimmer down and a steady shot than other factors.
Sony ILCE-7RM5 FE 400-800mm F6.3-8 G OSS ƒ/9.0 800.0 mm 1/500 iso320
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Sony ILCE-7RM5 FE 400-800mm F6.3-8 G OSS ƒ/9.0 795.0 mm 1/500 iso320
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Tried some close ups of these Gulf Fritillaries at 400mm... Getting both in focus while one was in flight was a challenge, I only managed it once, but that is not the lens fault, just nature of the type of shot.
Sony ILCE-7RM5 FE 400-800mm F6.3-8 G OSS ƒ/8.0 400.0 mm 1/2500 iso1600
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Sony ILCE-7RM5 FE 400-800mm F6.3-8 G OSS ƒ/8.0 400.0 mm 1/2500 iso2000
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Hmmm... I wonder how that tastes?
Sony ILCE-7RM5 FE 400-800mm F6.3-8 G OSS ƒ/8.0 800.0 mm 1/2500 iso500
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Mmmmm... tastes... yellow?
Sony ILCE-7RM5 FE 400-800mm F6.3-8 G OSS ƒ/8.0 800.0 mm 1/2500 iso640