Just to add clarity to "analog resolution" - film, optics, and analog signal resolution is generally measured similar to pixel pitch.

You take a card with two black squares with a white square between, and a card with just a grey rectangle, then see how far away you can tell the cards apart, on your photograph, thru the optics eyepiece, or on the oscilloscope. In other words, what angle does 2 dots look like 1 dot. Then how many of said angles fit on a rectangle - there's your megapixels equivilent.

The cards look something like this https://en.wikipedia.org/wiki/EIA_1956_resolution_chart

It's kind of funny that some people don't realize that a lot of 1960s photos and movies are higher resolution than 4k movies are today. Good IMAX and 35mm film was very high res.