Here is an explanation of what "bump focus" means and why it is particularly useful for BIF. Of course it can be done with half shutter press but I like the back button method better. http://www.birdphotographers.net/for...-focus-for-BIF
Here is an explanation of what "bump focus" means and why it is particularly useful for BIF. Of course it can be done with half shutter press but I like the back button method better. http://www.birdphotographers.net/for...-focus-for-BIF