I used a picture of my hand. We’re just going for ratios, so that should be fine,
Only if you’re sure your hand is perpendicular to the line of sight of your camera (and not too close to it), otherwise you might get foreshortening effects.
Yes, the key thing being perspective. Simple angling is fine, because we just care about ratios, but the closer your hand is to the lens the more angling will distort the measurement through perspective.
Only if you’re sure your hand is perpendicular to the line of sight of your camera (and not too close to it), otherwise you might get foreshortening effects.
Yes, the key thing being perspective. Simple angling is fine, because we just care about ratios, but the closer your hand is to the lens the more angling will distort the measurement through perspective.