This is guest post from our friend Alex Phan:

Hands-on with new Sony FE 600mm F4 GM OS.

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As always, big thanks to Sony USA for making the lens available. 🙏🙏🙏😍😍.
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April 19, 2017, A9 was born. Without a doubt, A9 has the best AF system in the market right now. However, without native lenses to support it, you can’t really can get the fully benefit of the A9. There are Sigma MC11 and Metabones mk V (5th generations). Overall, it works but it still not as fast as native. You can’t get the 20 fps via adapter. Before the release of 400GM, i’ve used Canon 500IS ii, 600IS ii, 800IS, Sigma 500mm f/4, Sigma 150-600 Sport via adapter with my A9. I get pretty good result out of it, but i have to work hard for it. My back and leg are not happy since all of those lenses are super heavy. I also can’t do handheld. Then last year, 400GM is out. Since then, i shoot with 400GM 98% of the time. I just wish for 600mm range and that dream come true today. I’m super happy and exciting to see the Sony 600mm f/4 finally here.

Sony A7R IV Field Test by Imaging Resource:

All in all, combining excellent image quality and performance with robust build quality, improved ergonomics and a wide range of features, the Sony A7R IV is an impressively versatile, professional-level camera.

Full review has been published on Photographyblog:

Overall, though, the new Sony Alpha A7R IV offers a compelling blend of out-and-out resolution, surprising speed and enhanced handling that widens its appeal beyond just portrait, landscape and architecture photographers.

Sony a7R IV initial review: What’s new and how it compares (Dpreview).

Sony A7R IV ( A7R4 ) – First Impressions Bird Photography with the Sony 100-400mm Lens

Sony A7rIV and new accessories:
Sony A7rIV in USA/CA at BHphoto, Adorama, FocusCamera, Amazon, Henrys.
Sony A7rIV in EU at Calumet DE, ParkUK, WexUK, Calumet NL.
Sony A7rIV in Asia at Sony Japan. Sony Australia.
Sony VG-C4EM grip in USA at BHphoto, Adorama, Amazon, FocusCamera, ParkUK, WexUK.
ECM-B1M Digital Audio Shotgun Microphone at BHphoto, Park UK.
XLR-K3M Mic at BHphoto, Park UK.