Originally posted by Kiwizinho I think I bought some of the longer ones, but but I think even on APS-C at 50mm they vignette a bit. They're fine on longer lenses, although I think my F 70-210 isn't going to get much more use.
My long ones are about 41mm from the glass. Even wide open on my A 50 1.7 I can not see it.
Not sure of this but did some sums. Diameter hood 58mm. Diameter glass 29mm. Height hood 41 mm.
According to my secondary school trig that puts the outer rim 19.5 degrees out from the glass. x2 = it should handle a 39 degree FOV. for the 50mm apsc fov 32 degrees , FF 47 degrees (diagonal). So as I have found in the field good for apsc and not good for FF.
But someone needs to check the maths out!!