benji77
@R.F.F
Hi, I cant seem to optimize the flash (power), and get even lighting results with the Hexar flash. I must be reading the GN# wrong.
For example, if I have ISO 1600, and would like for fill flash onto a group of 2-8 people indoor (restaurant, building etc), would I have to set the aperture (A Mode) to F8?
I shot it wide open, and blew the subjects with flash they look like angels. :bang: I managed to save them in post processing, but would like to know what I am doing wrong.
Should high iso's be used with F4-F8's and the opposite for Low ISO (100 - 400)?
For example, if I have ISO 1600, and would like for fill flash onto a group of 2-8 people indoor (restaurant, building etc), would I have to set the aperture (A Mode) to F8?
I shot it wide open, and blew the subjects with flash they look like angels. :bang: I managed to save them in post processing, but would like to know what I am doing wrong.
Should high iso's be used with F4-F8's and the opposite for Low ISO (100 - 400)?
pvdhaar
Peter
No wonder your subjects looked like angels.. you really zapped them 
At 100ISO, the HX-14 has GN=14. That means that at aperture F2, you can correctly light something 7m (20ft) away. The basic rule is Aperture=GN/distance.
At 400ISO, that GN=14 doubles to 28, and at 1600ISO, it doubles again to 56. For something at 7meters away, that would mean for ISO 1600 Aperture=56/7=F8. And for subjects at 3.5m (10ft or so), it's F16..
At 100ISO, the HX-14 has GN=14. That means that at aperture F2, you can correctly light something 7m (20ft) away. The basic rule is Aperture=GN/distance.
At 400ISO, that GN=14 doubles to 28, and at 1600ISO, it doubles again to 56. For something at 7meters away, that would mean for ISO 1600 Aperture=56/7=F8. And for subjects at 3.5m (10ft or so), it's F16..
benji77
@R.F.F
Thanks for the note.
Would it mean that my flash power now is dependent on the ISO?
In using my DSLR, I prefer a high ISO, roughly F4, and average power of the flash, this would allow for a nicely lit background, and not blacked out.
Wow, I really have to get this GN thing right!
Would it mean that my flash power now is dependent on the ISO?
In using my DSLR, I prefer a high ISO, roughly F4, and average power of the flash, this would allow for a nicely lit background, and not blacked out.
Wow, I really have to get this GN thing right!