Be honest, how many knew what this symbol is for?

See https://fstoppers.com …symbol-your-camera-633202

Yes I do know what it means but was unsure of its technical name.

Going back to the film days, it marked the position of the current film frame in the camera.

I learned about that symbol back in my days of obsessing over AF accuracy and using a variety of testing setups to come up with the "perfect" AFMA value. Happy to be on mirrorless now.

I'm old enough to have had to use it.

I bought an R7 yesterday. I was going through the owner's manual and saw there was a focal plane mark (no. 5 on the schematic, or something), just like the old film cameras. (I guess they don't call it the film-plane mark anymore.) This morning I woke up and saw this article.

Sure enough, there it is on the camera. Engraved black on black, though, so pretty discrete. I had to go looking for it. I was surprised at how far forward it is on a mirrorless body. Took me a little bit to find it.

drsilver wrote in post #19524668
I bought an R7 yesterday. I was going through the owner's manual and saw there was a focal plane mark (no. 5 on the schematic, or something), just like the old film cameras. (I guess they don't call it the film-plane mark anymore.) This morning I woke up and saw this article.

Sure enough, there it is on the camera. Engraved black on black, though, so pretty discrete. I had to go looking for it. I was surprised at how far forward it is on a mirrorless body. Took me a little bit to find it.

Yeah, it is 'way up front.

Absolutly. Having learned the finer aspects of photography from an old German guy who was doing photography for patent artists, I found out it's importance early in my photographic journey. We were using an old Graflex with a 4x5 Polaroid back, we use to have to measure subject to film plane distance accurately Still remember the smell of the fixative wand you would have to wipe the image with after development. Probably contained all kinds of carcinogens, but I loved that smell.

Never used it! Nver understood it! Never missed it! Ignorance is bliss1

Rather interesting, my first SLR was a Konica Autoreflex; specifically the initial model released in 1965 that gave the user the ability to shoot full frame or half-frame 35mm. It had the mark and used the nomenclature "focal plane mark". That was 58 years ago!

I have known for many years what it means. Did I win a prize?

I used the focal plane indication a lot shooting macro back in the "dark ages".

I knew.

It's still there, on my first Canon camera.

I was 12 when I learned what that mark was for...60 years ago.

I knew, but only because I read the camera's manual.