Hello,
I recently used a S4 XT Zoom 15°/30°, and I noticed that I couldn't get a clear/sharp image with the 30° aperture, it was lot smaller (the biggest size was obtained approximatively with a 22° aperture). Is it because the 15°/30° are the field-angles, and not the beam-angles like I thought ?
Thanks for your answer, I have lot more gobos to draw for this S4 XT, and I need to understand which angles I can (or can't) use !
Erwan.