first i need to say: i dont know what i did wrong yesterday, but everything works perfect today…
i think it has to do with the aspect ratio of the film back, too. if the AR is at the default 1:1,5 and your resolution is set to 400*300 1:1,33 – maya uses only a portion of the filmback. its like 35mm film. depending on the format you use, different portions of your filmback will be exposed. but you need to be aware that if you dont have same AR not to use “Fit Resolution Gate: Fill” for the cam. “Fill” only works if you got same AR.
but im wondering because “horizontal” is the default here with maya 8.
payton