Size of viewfinder image?

Looking through the viewfinder of my Olympus E-M1.3, with the eyepiece adjusted to suit my vision, the image is life-size when the focal length is somewhere around 35mm (70mm FF). This corresponds to an angle of view (diagonally) of about 34 degrees.

I wonder if this is typical of modern digital cameras. At what focal length (FF equivalent) do you see a life-size image in the viewfinder of your camera?

I have already posted this on dpreview, but this thread is for anyone who is not on dpreview and would like to contribute.

What do you mean by "life-size?"

If you keep both eyes open and look in the viewfinder with one eye and at the scene directly with the other eye, the image you see in the viewfinder is the same size as what you see with the other eye.

That's a nice wide angle, around 45 degrees by my calculation.

Yes, Alan, it is surprisingly hard to be accurate! That's about the same as my E-M1.3.

HAND.

In my Sony I can only magnify the viewfinder to 14x, not to life size.

On my X-T4 it's 37.4mm (56mm in FF)
Here's how I did it:
- I have a 45mm x 30mm drawing plate (so 3 x 2 like the sensor).
- I set the EVF to show 100% of the image.
- With both eyes open, I moved the camera closer until the plate seen directly by my left eye filled the entire EVF seen by my right eye. At this point I covered the lens with my hand so that I couldn't see any image in the EVF, just some light. Even so, this is difficult because the images don't overlap, I suppose because of the parallax effect.
- In this position, I uncovered the lens and adjusted the focal length until the image of the plate completely filled the EVF.
- I took a shot and read the EXIF of the photo.

I'm not an expert on the technicalities of cameras, but I think 75% means the EVF is only being used for 75% of its size. So the focal length found is 25% longer.
In practical terms:
50mm x 75% = 37.5mm
37.5mm x 1.5 (crop factor) = 50mm 56,25mm in FF

While looking through the EVF, press the display button to switch between 75% and 100%.

As I've already said, I'm not an expert and I could be making a big mistake.😀

I made a reading error. You wrote 75 mm and I read 75%. I apologize.

It's the diopter adjustment on the viewfinder that makes the difference, but I'm not sure how much.

HAND.

Yes, of course! I should have made clear that the camera lens should be focussed at infinitely to eliminate these variations.

Maybe 60 mm equiv. ... [edit] ... but I had a magnifier on the VF, so maybe not! [/edit]

What is the formula for 'angle of view' in this context, please?