Thanks a lot for your indepth thoughts, tupp. Much appreciated!
My description 'banding' was poorly used, since I indeed meant some internal reflections (also thought by ARRI). In almost all the tests I did with the Alexa, these darkened areas were almost always visible (sometimes a larger area when on 1 side, depending on the light source location). Not only with the 55mm that I used for the test and short, but also with the 28mm (100mm not so much). In all the shots I created with Magic Lantern, and the reversed 55mm, no banding was visible.
You are right about a better scientific approach, and have the same setup (I will try this when I have time for it). Because the difference seems so clear to me, I was hoping to get to know if the sensor of the 5D is not fully used in crop mode. Do you happen to know if this is the case?
I haven't thought about your last suggestion. The Alexa is light sealed, but I have adapted it with a Leitax mount. Maybe that might be the problem..
Thanks again!
My description 'banding' was poorly used, since I indeed meant some internal reflections (also thought by ARRI). In almost all the tests I did with the Alexa, these darkened areas were almost always visible (sometimes a larger area when on 1 side, depending on the light source location). Not only with the 55mm that I used for the test and short, but also with the 28mm (100mm not so much). In all the shots I created with Magic Lantern, and the reversed 55mm, no banding was visible.
You are right about a better scientific approach, and have the same setup (I will try this when I have time for it). Because the difference seems so clear to me, I was hoping to get to know if the sensor of the 5D is not fully used in crop mode. Do you happen to know if this is the case?
I haven't thought about your last suggestion. The Alexa is light sealed, but I have adapted it with a Leitax mount. Maybe that might be the problem..
Thanks again!