View Full Version : Just need to confirm my thinking:::
andylo
09-11-2010, 11:16am
If I am stacking 2 x flashlights together...
I did NOT extended it's effective distance.
I ONLY double amount of light illuminate to my subject. (Which means my subject is 2 x brighter)
Looking forward to you answer :)
Yes, assuming both lights are =
andylo
09-11-2010, 11:23am
Yep, same setting everything. Same model of light too.
ameerat42
09-11-2010, 7:46pm
And, if they are of equal output, your exposure is increased by only 1 f-stop, though... Am.
Oh! really? Damn, I thought it's more than that :(
ameerat42
10-11-2010, 5:27pm
Nope! N times the light/area of glass/aperture = sqrt of N increase in exposure. (This is the BRIGHT side, if you had 3 equival flashes you'd only 1.7 times the exposure. So you'd need 4 equiv flashes to get an increase of 2 f-stops.) Inverse square law for light intensity.
Am.
Longshots
13-11-2010, 9:00am
very useful response Ameerat42 :)
Powered by vBulletin® Version 4.2.3 Copyright © 2024 vBulletin Solutions, Inc. All rights reserved.