Re: mired

[T3D John Bercovitz <bercov@xxxxxxxxxxx>]

BobH reminded me off-list how the mired system works.  (It's very
simple but then so am I; I just have to be reminded if a day goes 
by 8-).  So the mireds are reciprocal degrees or more specifically 
10^6 divided by the temperature in Kelvin.  Adding that to the spread
sheet I get:

    A             B                C             D 

wavelength     temperature  temperature  black body emission    
 microns         Kelvin        mireds        watts/sq cm
                                         per micron increment

  0.5             3000          333           81.9          
  0.5             4000          250          901.4     
  0.5             5000          200         3807.8   
  0.5             6000          167         9985.4

  0.6             3000          333          162.9           
  0.6             4000          250         1203.3
  0.6             5000          200         4012.9
  0.6             6000          167         9015.0

And now we see that what I observed before, that the same filter
that would take you from 6000K to 4000K would also take you from
4000K to 3000K is also true in the mired system because the dif-
fernce between 6000K and 4000K is 83 mireds and the same can be 
said for the difference between 4000K and 3000K.  OK, so it works.
Nice.  Have I become unmired now?  Possibly.

I still want to know what would be a minimum light temperature to
meet what sort of specifications for viewing.  8-)

John


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