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Hi all! I have been a canon user for years and started with the 5d mkII (85mm f1.8 prime and 24-105 f4 L) especially involved in dynamic (street photography) and lowlight photography in the first place, i.e. stage photography (in harsh conditions -no flash, low light, handheld, comedians performing live...) then I started to specialize in staged studio portraiture (2× Elinchrom 500w). I also developped DOP skills in a cinema project and used the Canon 5dmk2 in that respect. The reasons for me to shift to Sony are: 1. Effective eye-tracking autofocus (is it me or did Canon really intend to commit commercial suicide not implementing that feature????) 2. Tack-sharpness and quick auto-focus 3. State-of-the art technology in the expert range outperforming canon 5ds and 6ds at a reasonable price tag. Now, three salesmen advised the sony A7III as a rational option for dynamic studio photography, which I do agree with. The point is I am really hesitating with the more expensive Sony Alpha7RIII since I like large format printings and super sharp portraits. I realize 42mp pictures will get my hard drives, CPU and retouching process busy. Suprisingly, two salesmen out of three told me the AlphaRIII was not proper to in-motion subject studio photography since the 42mp resolution was slower to process and would consequently generate inaccurate rendering/softness requiring to double the speed to reach tack-sharp shots (eye-focused) even with studio strobe. In short, SonyAR3 for POSED portraiture, macro, packshooting, stills, architecture, landscapes... only. My basic settings for studio are: 1/125th at 100 ISO. Subjects are not running, not bouncing, not headbanging on 200 bpm speed metal music. They just move as they would do in normal life, somewhat slower... I don't get it since that statement would mean the A7R3 could then not be able to deliver proper 42mp tack-sharp shots (full view) below 1/200th unless I'd ask my models to freeze??? Otherwise 'the expected softness/blur' will be quite noticeable and will ruin your work, given the super high resolution' they said. After a few questions, the salesmen admitted not being experienced in studio (were more 'macro, packshooting, nature...). What do you guys think? How well does the A7R3 perform in dynamic studio photography? How does it behave and compare with the A7R3 in that respect? Thank you so much in advance for your help!

I am using a Sony S7 R2 in the studio setting. I have used this 90 mm macro lens for portraits before with strobes and no problems. Prior to trying today I was using a 24 to 70 G. It fired my strobes every time with no issues. When I attached the 90 mm, the strobes stopped firing when I push the shutter. All strobes fire when hitting the button on the receiver. Am I doing something wrong?