I'm trying to make sense of some field impressions concerning image steadiness between different binos (same power).
I have read alot in various threads about the effect of ergonomics, weight, etc. on the ability to hold a steady image. It seems that perhaps the overall length of the binos (or eyepiece to objective) might also be a significant factor -like the wheelbase on a vehicle.
From an optical system standpoint, is this plausible?
I think it is plausible from a simple physics standpoint. The inertia of the binocular relative to movements perpendicular to the optical axis is greater the more its mass is distributed away from its center of gravity. I have found that I cannot hold my Nikon 10x42 SE as steady as longer-bodied roof-prism binoculars suchs as, say, a Zeiss 10x42 FL. Weight and other optical parameters are very similar between them.
Kimmo
Other than that, the longer shape of roofs helps me line up the bins faster. I have a hand feel for lining them up, whereas I need wide field with porros, I do not get it quite straight for a fleeting look at elusive birds.