This is the part that confuses me. The 19 filter is only supposed to allow the passage of a slight percentage of green-ish wavelengths, and this was very evident in my not-at-all scientific test; there was a definite green band right where one would expect it, were they looking at the chart for the 19 filter. I was under the impression that this wouldn't be an issue when I ordered the 19 and 27 filters, because I'd read so many reports of them being great cutoff filters for the sodium lamp...but somehow I still got a definite graying of the paper after less than a minute's time. With that said, I can't figure out how the other two filter numbers would help, because they seem to be letting in a lot of blue/green wavelengths.
Originally Posted by Ken Nadvornick
I just found that online not too long ago; thanks for posting it!
Originally Posted by frobozz
I think the filters I had in mine when I got it were the older style, as well...and they were desiccated beyond recognition. I'm almost tempted to buy the inner set and see what comes in them...but that may have to wait until I have some extra cash. For now, I'm hoping that the rubylith I ordered will come in soon and hopefully allow me to actually use the safelight, rather than just look at it.
Originally Posted by Greg Davis