Originally Posted by boothman
I have a max 120" width for scope so approx. 51x120. For 16x9 image would be 67x120. Would use horizontal masking panels for scope. I have a lens for use with a new JVC projector when available. In this configuration is using the a-lens for scope and zooming for the large 16x9 image a good idea or go with CIH with 51x90 for 16x9?
I'm a bit confused about what you actually want to do??
You would only use the lens if you were to use a scope screen with it.
If you are using a 16.9 screen (which is how your post above reads) then you just set everything up for that format and whenever scope material is viewed you would just mask the bars top and bottom.
If you are width limited then you are better off with the largest size 16.9 screen you could fit. All your proposal of going CIH seems to be doing is keeping your scope material the same as now (120 inch) but making your 16.9 material smaller and introducing a lens to the equation also.
I am confident that if you were to go ahead and configure your setup the way you asked (using a lens for scope and zooming for 16.9) you would be the only person in the world doing so. (I'm guessing you are confusing whether to use a lens or the zoom method for scope, or just a typo maybe).
The idea of CIH is to have the screen large enough so that when you are seated 16.9 material is at its maximum size and then when you put on your scope material the image widens as intended by the director.