whats correct aspect ratio

im puzzled as to the correct aspect ratio setting for 1920 x 1200 and 1920 x 1080resolutions ?
any one can tel me asap thanks

If I understand the question....the aspect ratio is the ratio between wide and hight. In your case 1920:1200 = 1.6 thats knows as 16:10. the other one is 1920:1080 = 1.(7) periodic [1.777777...] thats knows as 16:9.
I hope this is helpful.

Hi Guys

Are you asking about the projector fixture, aspect ratio field? If so please just type your resolution with a / in between the numbers in that box, so if your projector resolution is 1920 x 1080 then enter 1920 / 1080. You can enter simple maths in those fields, which is why this works..

Thanks and best regards