NBEast wrote in post #17791577
I'm not a birder but the idea of flash for wildlife seemed funny. I mean, wouldn't it scare them away? Interesting that it's an accepted practice. Thanks for illuminating it for me (pardon the pun).
Just a quick note on this. From experience flash doesn't tend to scare birds off. However, it does seem to produce a startle sort of reflex reaction, especially with small birds on the ground. Either the base of the wing twitches, or their wings can flick open completely without them actually taking off (in other words with flash, I got lots of shots with their wings open). This happens when using TTL flash, where the pre-flashed causes the startle reflex reaction, and the main flash captures it. When using TTL flash as fill-in, you get get a ghost image around the base of the wing caused by the twitch from the natural light part of the image. It looks like a strange sort of blurring around the wing base. The solution is to use the flash in manual mode, but it isn't easy judging the exposure as the distance you encounter a bird obviously varies.
I have similar but limited experience with deer. The deer seem to be more bothered about you and shutter noise, but with flash the shoulder muscles do a sort of reflex twitch. Although as I said, in general birds don't actually take off when the flash goes off, and things like shutter noise, or movement by the photographer are the most likely trigger to cause the bird to actually take off. The other thing, is after this startle reaction a few times, it dies down when the bird gets used to it by habituation. Overall the bird or other animal seems to be far more scared by the presence of a human, than a flash from a flashgun.