Yes it needs it if you want to acheive D65 (so far, we are looking on how to remove it).
We have the notion of "etalon" that are available for all major lcd/dlp/sxrd on the market.
If your one is listed there is no need.
Laric, I'm in the process of building 1(actually 2) and I was wondering how it was to be calibrated. where is this "etalon" and how do you use it.
I have a question about the components list for the probe.
Some of the capacitor values are different on the schematic drawing to the web site list.
Is the list on the web the one to follow?
56uF~100uF 10v(noted that the pics show a 16v item.)
Chemical polarized? I asked an electronics engineer and he had never heard of that term for a electrolite Capacitor.
The micro switch sw1,sw2, is the farnell 947-1707 microswitch the correct type.
X1-Quartz-4mhz is farnell 971-2283 the correct one.
Q1-npn-BC547 is farnell 109-7287 the correct one.
Also is there a French/English help(operation) file avaliable?
I'm in New Zealand so PAL is the prefered system so this will work well for us here.