As a point of interest am I alone in wondering how many BF members have missed spotting a bird due to lack of FOV?
Put another way how important is FOV to the study of a given subject once you have the critter in your sights?
A 99.9% light gathering figure and limited but awesome "sweet spot" appears far more desirable to this admitedly Old Reactionary.
LGM
advantages of wide FOV:
1. frequently diving birds (grebes, divers,...) The more FOV, the faster you will get them sharp in your bins.
2. fast moving birds in canopy / bushes. The more FOV, the faster... etcetera.
3. counting flocks on migration overhead. A large FOV enables you to keep all birds in your view.
4. watching hummers that hoover, move quickly for some meters, hoover again,... Just try following them with your small FOV.
5. scanning lakes edges for movement.
6. scanning the sea while seawatching. A wide FOV is all the difference between catching and not catching that low-flying shearwater that flies under the waves for some time.
7. scanning the action: for example foraging waders constantly running around, or that same flock flying around, or murmuring starlings. If you don't have a wide FOV, you simply don't see the whole story of the interaction / dynamics.
8. I can go on and on...
Maybe the best example: My avatar is a Western Tragopan. That's a shy forest pheasant of the Western Himalayas. I saw the bird moving in the understory, but as there is a lot of cover (mainly ringal bamboo), I didn't know for sure where it would pop up next (or completely disappear) while moving around. I focused on an area with less dense vegetation (with my bins). With a small FOV, I could have easily just missed them coming out of the woods... That is the difference: people who don't appreciate large FOV actually don't know what birds they are missing, simply because they haven't seen them! ha!
I wonder if you have ever actually watched birds?