Hi, what will happen when adapter is used to install smaller bulb like M2 on Flash unit originally for larger bulb like No.5? Any effects or differences when taking photo? BTW, what is guide number and what are they used for and how to use them?
Originally Posted by brianmquinn
You said: "For those not skilled at guide number calculations; you loose about one stop of light with an adapter." >> Do you mind explain it?
Last edited by windly9; 04-02-2011 at 08:12 AM. Click to view previous post history.