Hi all, I've been using my 160ed for some time now with an EFW and 50mm filters. (directly attached, asi2600+EFW) That puts the filters about 20mm away from the sensor. (i think)
in calculating the angle of incidence at the edges, at F3.3, even a 50mm filter can cause vignetting? Is my math correct? (530mm Focal length, F3.3, full frame sensor) A diameter of ~53mm would steer clear of causing vignetting (if that was a size)
Maybe this is obvious to everyone else? i'm sure flats could help correct it, but just wondering if i'm missing something in the math here
CS!
in calculating the angle of incidence at the edges, at F3.3, even a 50mm filter can cause vignetting? Is my math correct? (530mm Focal length, F3.3, full frame sensor) A diameter of ~53mm would steer clear of causing vignetting (if that was a size)
Maybe this is obvious to everyone else? i'm sure flats could help correct it, but just wondering if i'm missing something in the math here
CS!
