EdmundOptics

This thing is ridiculous! What you get for the money, a very good quality day/NV scope with a great quality (power) IR illuminator, and a LRF WITH ballistic calculations AND a fully capable thermal scope in one package is just spectacular! This thing is literally combining the best of both worlds, and for this price, there is NOTHING in the world that compares! DNT has hit a homerun with this one!

In other words, SU has been using the left column to convert AOV to focal length when it should be using the middle one because vertical AOV is what SU’s camera is based on.

Using their formulas I was able to make my own table of frequently used lenses for 35mm/Full Frame photography. (BTW, 43mm is the theoretical “normal” focal length for 35mm film frame)

Thorlabs

I’ve been looking at all these things again recently, and after some discussion in another thread, I think SU’s FOV conversion is actually mixed up.

First of all, Filed of View is actually measured in units of length like feet or meters, and Angle of View is measured in degrees, so the term hasn’t really been used correctly by SU all these years.

My understanding is that SketchUp uses the vertical angle of view, and that agrees with what I find when I do Match Photo. However, if you set the angle of view to 81.2°, which is the vertical AOV for a 14mm lens, SU reports that as a 21mm lens. 81.2° happens to be the horizontal AOV for a 21mm lens, so I’m wondering if this is an error in the formula that’s been used all these years by this function.