Since going on safari, I've started to get more into birding. The lighting often seems a bit flat, so I'm looking for tips on either customising an old flash that I have, or on buying accessories to improve the range / narrow its beam.
There's several modifiers that I have owned/used for this.
Better Beamer- IMO, flimsy and overpriced. HDD XT-A25- a little better design, but more cumbersome. Magbeam- probably the most versatile, but more expensive and dang it's big/bulky... it's the one I currently own.
There are plenty of DIY "flash extender" tutorials on the web.
Normally I just don't bother with them... instead I opted to get a speedlight with the longest zoom setting I could find (Godox V860II Li-Ion) and I just use that. Normally you only want a little bit of fill, not to overpower the environment.
I also don't bother with mounting the flash on a bracket... even if you get the flash 2ft away it doesn't significantly change the angle of incidence if there is any significant subject distance, and there usually is.