If you’re just getting started in learning how to light your shot with flashes, you may be confused about the terms “high speed sync” and “flash duration.” Here’s a helpful 6-minute primer in which photographer Daniel Norton explains what these two concepts are, how they differ, and which situations they come in handy for.
In his first example, Norton uses high speed sync to shoot at 1/4000th of a second, well over the maximum sync speed of his flash (1/250s in normal mode), in order to capture an outdoor portrait at f/1.2 for a very shallow depth of field.
![]()
Norton then uses a short flash duration (1/15000s) in order to freeze flying water in midair with tack-sharp clarity.
![]()
(via Adorama TV via ISO 1200)

Started out doing photography at the age of 6 using an uncle's old 1940 kodak brownie box camera. At 15 years of age, I decided to buy my very own 1975 Praktica SLR camera. I now shoot with a Nikon D850. I do unpaid TFP and commercial paid work.