Re: [APML]: 37 films tested (was Gold Max)

[Chuck Vaughn <aa6g@aa6g.org>]

Robert Reeves wrote:
>  
> As long as I am on the phone, I'll explain two more points about these LED
> tests.  The orriginal exposures had four LEDs in them, the blue, green, and
> two different reds.  I had a 650 nanometer red and the 660 nanometer red.
> The goals was to see which films croaked crossing the H-Alpha wavelength.
> Unfortunately, the 650 nanometer one turned out to be much dimmer than the
> others and barely showed up at all.

An additional test that I think would be useful for astrophotography would be
to use an LED at 500nm (if you can find one). It seems almost all films 
have poor response here because of the nature of the layers. It seems that
PPF is the only film with some response at 500nm but I wonder how much
compared to the center wavelengths of each layer.

Chuck  <aa6g@aa6g.org>