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Hello, I need an advice, want to change my Olympus Pen 5 into Sony Alpha A7S. Would you reccoment it for photography with zoom, bird and animals? Here are its characteristics https://cameravs.com/Sony-Alpha-A7S-II Thank you.
No experience with the Sony. However, what do you hope to achieve with this switch? I noticed this is a camera that came out in 2015, so not exactly the latest and greatest.
Fast shot = short delay?
Fast shot = High burst rate?
Fast shot = Short exposure times?
Fast shot = Fast AF?
"Good zoom" is a matter of the lens, not the body.
Due to the very low resolution plus larger sensor you will get the birds just 1/3 the size compared to your Pen 5, as long as You use the same focal length.
If size, prize and weight is not a problem, then go choosing a low res 24x36 body as the A7S is and attach a 600 or 800mm lens to get a slow and medium quality setup. The A7S II just offers contrast AF, not a single phase AF point at all.
Otherwise you should choose an APS-C body w/ 150-600 (Canon 90D: 10fps, 32 MP, 4k Video) or take a look at the excellent Olympus 4/300 plus a fast body.