jcolwell Offline Upload & Sell: On
|
I figure the amount of blur is directly proportional to the angle of view (AOV), not focal length (f). Based on FF diagonal AOV,
f = 20mm, AOV = 94 deg
f = 50mm, AOV = 47 deg
f = 100mm, AOV = 24 deg
5 px at 50mm (47 deg) ~ 2.5 px at 20mm ~ 9.7px at 100mm ...
Oh wait, that's more or less exactly what you said. Nevermind.
|