I spent a good 8 or 9 days in May, all day, in Central Park in NYC
shooting the migrating birds (warblers, vireos, thrushes, tanagers,
buntings).  In most situations, with my 100-400IS and a 1.4x TC (f/8
combined), I needed ISO 1600 about 75% of the time.  There just isn't
that much light inside the trees when the foliage grows in the spring.
Lots of pictures were under-exposed, or had too much fill-flash, even at
ISO 1600.  When I shoot with the camera set to ISO 1600, though, I am
usually shooting with a much lower exposure index; I usually have the EC
set to +2/3 or +1, and have some flash fill as well, so the real
exposure index is as low as 800 or even 640. if there is sufficient
light, or as high as 3200, if the flash does all of the illumination
(but those are not aesthetically pleasing, with the clear, distinct
shadows).  Makes me wish the camera had an option to ratio flash fill
based on *achieved* ambient exposure, rather than target ambient
exposure.

According to VK <vandit.kalia@gmail.com>:

    I like those shots -- *all* of them.  Though there seems to be a
problem with the egrets:

    http://www.photosafariindia.com/galleries/wildlife/page003.html

    I've tried two different browsers, and get the same truncated
image.

    Thanks for the nice shots,
        DoN.