Okay, back to your binobox. How is the chromatic aberration? I'm pretty sensitive to that with a telescope, but don't notice it much in my binos. Is it because of the lower magnifications involved?
I'm toying with the idea of using a pair of the 6" Istar f/5 objectives to make a binobox. I'm also concerned about field curvature in an f/5 objective. How is the field curvature in yours?
Good question...I have both the Istar 6 inch f/5 lens set (in a MonoBox design I did last year) and of course the 5 inch f/5.5 lens sets.
Not overly impressed with CA and field curvature in the 6 inch....the 5 inch lens sets are much better in both parameters. Stars are pinpoint using Panoptics out to 90% of edge of field in 5 inch.
Actually, my Celestron (Synta) 6 inch f/5 shows a much better image than the Istar 6 inch, so the Istar's shortcomings go beyond the laws of physics.
However, for magnifications under 75x, the 6 inch f/5 objectives would do a good job for scanning MW fields.