Preorders:
Sigma 28-70mm at BHphoto. Adorama. FocusCamera. FotoKoch Germany.
Product page at Sigma Global.

Reviews:
First Look at the Pixelconnection. Preview by CameraLabs. Review by Marc Alhadeff.

Video reviews:

Images:

Preorders:
FX3 at BHphoto, Adorama. FocusCamera.
FX3 in Europe at Fotokoch Germany, FotoErhardt Germany, Calumet Germany, WexUK, Park UK.

German:

Italian:

Preorders:
FX3 at BHphoto, Adorama. FocusCamera.
FX3 in Europe at Fotokoch Germany, FotoErhardt Germany, Calumet Germany, WexUK, Park UK.

Reviews:
Presentation with real world images at Explora. Product page at Sony UK. German hands-on video at Fotokoch.

Youtuber Videos:

Official Product videos

NiSi 15mm f/4 Sunstar Hands on Review

Sony Probably Should Have Patented This (Camera Conspiracies).
A Camouflage Buying Guide for Wildlife Photographers (Explora).
Tamron 17-70mm review at Photographyblog.
Sony Wins The Big Game With Alpha 1 and Venice (Sonymirrorlesspro).
Samyang/Rokinon 21mm f1.4 Review (Savethejourbey).
Review of the Haida Rear ND Filters for Sony 12-24 F2.8 GM / Sigma 14-24 F2.8 (SonyAlphablog).
Systemkamera TV #005: Kaufberatung SD-Karten / Speicherkarten

Personal photos and tests from SAR Admin Andrea on Instagram, Facebook, Flickr and 500px.

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We have our own Facebook camera groups and pages you can join to discuss the upcoming new cameras in detail:
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Sony A7rIV group and Sony A7rIV page
Sony A7sIII group and Sony A7sIII page
Sony A7III group and Sony A7III page
Note: In groups you can post your own stuff like images, news and questions. While on pages you will read the specific camera news from SAR.