This site I've found is the best resource for the measurements to help you determine it. Here's the article explaining the chart you should be looking at, and I believe the A7R IV was recently added, but I'm on mobile at the moment
This site I've found is the best resource for the measurements to help you determine it. Here's the article explaining the chart you should be looking at, and I believe the A7R IV was recently added, but I'm on mobile at the moment