Martin Evans
New member
Can anyone give me an approximate value for the Guide Number of a typical flash as fitted to a cell phone ("mobile phone" in Britain) or smart phone with built-in camera?
I am updating my "essay" on flash photography in galleries and museums, and would like to calculate the gallery-lighting time equivalent, as it might affect conservation issues. The technical data that I have seen for cell phones do not give any values; just a simple statement that the flash is a dual-LED unit or some-such.
I don't want four-figure accuracy! Just a ball-park number. From real data or personal knowledge, please, not a guesstimate.
Thanks and best wishes to all; apologies for long absence.
Martin
I am updating my "essay" on flash photography in galleries and museums, and would like to calculate the gallery-lighting time equivalent, as it might affect conservation issues. The technical data that I have seen for cell phones do not give any values; just a simple statement that the flash is a dual-LED unit or some-such.
I don't want four-figure accuracy! Just a ball-park number. From real data or personal knowledge, please, not a guesstimate.
Thanks and best wishes to all; apologies for long absence.
Martin