I love this discussion with you guys, much more civil and pragmatic than other forums I've been on. Thanks for welcoming me and letting me jump right in.
I've never tested field of view, until this morning. Lol, I am a teacher and tested positive last weekend for Covid so I've been quarantined at home, despite covering all the bases with vaccines, etc . This is the first day I've had any energy and needed to get up and around.
Anyhow, measured 3.41' (3'5") and placed a vertical piece of black electrical tape at each end of that on my white garage door. Measured off 30 feet from the door which would be 10 yards.
At 10 yards the vertical strips of tape should be right at the outer edge of field of view. With both pairs of sale binoculars, the ones from last year and the ones from this year, I had a steady hand and the black tape was right at the far left and far right edges.
I then moved the tape to 3.19' (3'2" roughly) Both pairs of 10x42's easily accommodated that width.
Then checked my 12x50 Vipers. 288' FOV, which would be 2.88 feet at 10 yards, or 2'10.5". The black tape was right at the edges of my view on either side.
Figured the 12x50s were the most known quantity of anything I have. They did just what they should assuming my measurements are even close to what they should be for accuracy purposes in my driveway.
Note: another member here said they checked out at 319-ish feet FOV. I took his description and duplicated that test. So, I have to think I'm pretty dang close.
In a nutshell: It's the first time I've ever checked fov. I may not be perfect and may not have gotten accurate observations from this experiment. I guess when you're talking about 22' FOV difference at 1000 yards probably not that big of a deal. Discriminating between two sets of lines that are 3.5 inches further apart at 10 yards is 1.75 inches on either side. Not exactly a lot of room for error, but tape lines unquestionably fit (were visible at the same time, touching the edges) in the view left to right at 10 yards doing the experiment for 341' fov.
Moral of all the discussion and checking into things: They are a great pair of binoculars IMO for $299 whether 319' or 341'.