I've been dealing with incessant morning overcast and humid air for almost 2 months during my morning photography outings, and ever since I bought my new C90 scope!
I've caught a Song Sparrow at 60m (
image here) when the overcast thinned (no direct sunlight, but higher ambient light). And reaching out to 100m has been "okay" (attached).
But although I can see the birds out at 230m or more, the low light (not a plus with my camera) and moist, hazy air are frustrating me (
image here). And moving subjects in low light, forget about it--my camera isn't good at that either. I envy folks catching those shots.
Regarding size. I've attempted a few shots of smaller birds on the same perch as the Kite in the 230m shot, and they come out as nothing but a silhouette. So I think subject size, color, and relative activity level do all come into play at as the distance grows (in addition to atmospheric issues).
I try not to complain, these cool/cold mornings this late into Summer have been a blessing to my electric bill. But I can't wait to see what I can do at longer ranges once the lighting improves.
And for those of you taking shots measure in
kilometers or reasonable fractions thereof--WOW.
That is "extreme digiscoping"--and impressive. :clap: