Specs Comparison: a7R IV Vs. a7R III Vs. Nikon Z7 Vs. Panasonic S1R
Here is a quick specs of new announced Sony a7R IV with other similar cameras: a7R III, Nikon Z7, Panasonic Lumix S1R. You can see full specs comparison at this page.
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Mirrorless Comparison: Sony a7R IV Vs. Nikon Z7 Vs. Panasonic S1R
Here is a quick size comparison of Sony a7R IV (B&H Photo Video/Adorama/Amazon) wih other related cameras.
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Sony a7R III Vs. Nikon Z7 Eye AF Test by dpreview
dpreview compared the Eye AF feature on Sony a7R III and Nikon Z7 at the CP+ show 2019. It seems Sony a7R III‘s eye AF is more accurate than Nikon Z7, and a7R III can detect eyes from further away.
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High ISO Comparison: Sony a7 III Vs. EOS R Vs. X-T3 Vs. Z7 Vs. Pocket 4K
Here are another video for the high ISO & low light video comparison for the Sony a7 III, Canon EOS R, Fujifilm X-T3, Nikon Z7 and Blackmagic Design Pocket Cinema Camera 4K.
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For Sports Photography: a9, a7R III, a7 III are Better Than EOS R and Z7 According to Tony Northrup
Tony Northrup has just published a full comparison video of Sony a9, a7R III, a7 III, Canon EOS R, Nikon Z7, Fujifilm X-T3 for sports photography. According to Tony, for the full frame mirrorless cameras, a9, a7R III, a7 III are better than Canon EOS R and Nikon Z7 for sports photography.
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Side by Side Comparison: Sony a7 III Vs. Canon EOS R Vs. Nikon Z7
Foto Hans Keuzekamp has compared Sony a7 III, Canon EOS R and Nikon Z7 full frame mirrorless cameras side by side.
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Read Noise Comparison: Sony a7R III Vs. Canon EOS R Vs. Nikon Z7
Photons to Photos has added Canon EOS R and Nikon Z7 to their database. Here is a read noise comparison on Sony a7R III (Amazon/B&H Photo/Adorama/Focus Camera) with Canon EOS R and Nikon Z7, from the result we can see that Sony a7R III has less noise overall that Canon EOS R and Nikon Z7.
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Specs Comparison: Sony a7 III & a7R III Vs. Nikon Z6 & Z7
Tomorrow, Nikon will officially announce the new Nikon Z6, Nikon Z7 full frame mirrorless cameras to compete current Sony a7 III and a7R III. Here is the specs comparison of Sony a7 III & a7R III Vs. Nikon Z6 & Z7: