FOV Tutorial - very useful for triple screen gamers

[phoenix1963]

Originally Posted by FS~Phat

... Most games these days are HOR+ which means vertical FOV is preserved even if you increase your resolution by using triple screen resolution.

Ah... I think you've answered something that has always puzzled me: so am I right in saying in HOR+ the devs change the "film" (or the pinhole) position to keep the vertical FOV constant? That kind of means slightly moving in a flight sim.

56RAF_phoenix

Duh - I just thought about it, it means they keep the film position the same.

But

Originally Posted by FS~Phat

...Pincushion distortion is one of the side effects of having an increased field of view. Much like a fish eye lens on a camera, the wider the FOV the greater the distortions

is surely wrong. In a correctly rectilinear projection you should see no distortion as long as you are viewing the monitor at the right distance and the FOV angle is less than 180 degrees.