Originally posted by 35mmfilmfan I accept this, but in the winter light levels are low, apart from any inclement weather (for which cyclo-cross is notorious). The events are, of necessity, 'off road', and frequently go through wooded areas, and it is the difference between the illumination to which the eye has become accustomed, and the sudden bright flash, that I feel could be an issue.
Check out this Video, then ask if you would appreciate a flash being used at close quarters in these conditions.
Cyclo-Cross Championships (1967) - YouTube I have shot both ride cycling and cyclocross, @35mmfilmfan, and ridden both kinds of events, by the sound of your posts you don't have the experience.
I have shot owls at night with flash, the Raptor centre I went to in Illinois last year was happy for anyone to have flash used indoors on their subjects (although I didn't do it), and a hospital in the States makes it quite clear that flash photography is fine with the newborn babies.
You have to understand that the duration is of the order 1/10000s to 1/1000s, and is usually just a doubling (one stop) above the ambient.
Models I've shot always prefer the HSS flash I use because they're not pained and squinting unlike when other photographers deploy reflectors.
And I 'eat my own dogfood', practice what I preach. This is me just a few months ago under the trees on a dark rainy day doing a trail run down a steep descent over a log. You notice the pro's powerful remote strobe has gone off, but it's so brief, that's it, you're not reeling about blinded or whatever, that's an absurd fiction from you!