Originally Posted by jwp475
... The larger the objective the better the resolution at long distances.
Iím not so sure about this.
I know that for camera lenses, in general, it is the opposite. That is, given equal quality glass, larger objectives will lower resolution.
For example a Canon L 400mm f5.6 with a 77mm objective will have higher resolution numbers than a Canon L 400 f2.8 with a 156mm objective. The f2.8 will let in a lot more light which is why it costs so much more but the f5.6 will out resolve it, throughout the aperture range, and especially wide open.
I could be wrong but I donít see why spotting scopes would be any different. It's too bad that no one objectively measures resolution on these so we would know for sure.