Matt explains that Sony absolutely has strong reasons both for and against making an A7S IV , but in the end he believes Sony will make it .

Why Sony might NOT make an A7S IV

• EVF argument is weaker now:

  The A7S III’s built-in EVF used to be a big advantage over the FX3.

  But Sony has now created a tilting video-centric EVF for the FX2.

  Matt thinks this new EVF will spread to future cinema bodies (FX3 II, etc.), reducing the need for an A7S-style hybrid camera.

• No active cooling:

  Sony has never put a fan in a non-cinema Alpha body.

  With 6K60 and heavy codecs becoming standard, a fan is practically needed , meaning Sony may prefer to push people toward the FX line (FX3 II) instead of releasing an A7S IV.

Why Sony WILL make an A7S IV

• People will definitely buy it:

  Even today, filmmakers still buy the A7S III for three reasons:

  1. It has a usable EVF

  2. It still shoots photos better than the FX3

  3. It’s cheaper and goes on sale more often

• Sony wants to sell more sensors:

  The A7S line uses the same sensor family as the FX cameras.

  More camera bodies = more sensor sales = more revenue for both Sony’s Camera Division and Sensor Division .

• Two different Sony teams = two different incentives:

  • Alpha division makes A7 cameras

  • Cinema division makes FX cameras

    Since they are separate teams with separate roadmaps , both divisions want “their own version” of the next-gen low-light/video sensor.

    That alone supports the idea of both an A7S IV AND an FX3 II .

Final takeaway

Matt believes the A7S line is not dead at all .

The real question is not “Do they need it?” but “Why wouldn’t they make it?”

His conclusion:

Sony will almost certainly release an A7S IV , because demand, pricing, internal structure, and sensor economics all point toward it happening.