Gidday all,
Puzzle for people found with binoculars or cameras glued to their eyes. Tyto
Wetlands is next door to Ingham airstrip. Medium-big helicopter took off as I
was watching Black Kites. Casually looked through 10x32 Gerbers (as you do) as
chopper sped across sky. Main rotor blades stood out sharply, in rotation.
Focussed digital Panasonic FZ30 camera (not DSLR, no live preview; lens set at
700mm=) on chopper, and the blades came almost to halt. Back to binos: blades
turning. Back to camera: blades near halt. Seems sighting through camera
viewfinder accentuated stroboscopic effect. Perhaps mono v stereo vision? Would
this apply if viewing through a scope? If what you see isn't what you get, it
might explain why seeming pin-sharp images seen during autofocussing hold no
magic on review. Imagine a hummingbird photographer seeing stable images and
getting blurred results. On the other hand, imagine stalling wing movement to
assist identification of, say, flying waders. Comment?
FYI: Immature Red-Capped Robin gone after seven weeks here, northeast of range,
but immature Rufous Songlark, also outside range, still about. Plus rare
showings here and further north of 100+ Sulphur-crested Cockatoo flocks.
Cheers, Tony Ashton
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