That's useful. Last time I checked into darkroom timers, some did 0.1s intervals but only up to 10s, after that, they switched to 1s steps. 10% increments are too coarse for me. My current timer is from RHDesigns and works in 1/12 stop increments, which is all I need.
Originally Posted by Kirk Keyes
This is all well and good, and we had this conversation a while back, but I stumbled across this by accident:
Originally Posted by BetterSense
The 'SPSE Handbook of Photographic Science and Engineering' published by the Society of Photographic Scientists and Engineers has a different view, which is, however, in line with the Oxford and Webster's Dictionary. On page 4 of my 1973 copy it states:
'The term 'light' describes that part of the electromagnetic spectrum to which the human eye is sensitive. It is normally considered to include wavelengths between 400 and 700 nm, although many observers can see wavelengths as short as 380 nm or as long as 760 nm.'
I have also attached a copy of the diagram which this excellent book shows on page 5. I believe to be in pretty good company with 'my' definition of light and stick to the statement that the term 'visible light' is tautological and redundant, since there is no such thing as not visible light.