Colour response of the filter itself _should_ be taken care of by the electronics of fhe camera. They will vary, and you can set _that_ in many cameras, along with saturation etc. To add to this most cameras come from the shop with (often puzzlingly) pre-set non-neutral settings.
This would have occurred with film as well.
However, I am very keen to get agreement on a _basic_ set of parameters. Stuff we should all be able to agree upon within a factor of 1.75. We can refine it from there.
I chose 1.75 because 2/3rd F-stop has often been quoted as the probable range of camera sensitivity disparities. It is still close enough, and far closer than the multiple exposure equivalent differences we are getting.
Moonrise. You have posted a lot of knowledge. Not joking. But you have not opined on a standard AFAICS. I am interested in your opinion on the idea and on your preferred settings to show a "real" representation of a torch beam.
Anyone. Has anyone else tried a preferred range of settings?
ice_theatre's move was very commendable, seriously. But we need to take that next step.
This is my fourth attempt. So far it's come closer to success than the others. It seems to be stumbling.
There are many very accurate ways to measure the brightness of a light. They involve light meters of some sort...but still require standards, such as angles, distances etc. We could use these. We could even simply use the cameras we own to give a series of comparative readings. But most people here want to see a beam shot, for obvious reasons; I mean we are all beam freaks right?
I would plump for this...IF we accepted standards. We would need a series of readings. _Then_ we can have field shots, no standards, and guess which ones I reckon will sway people the most!
Some have mentioned the idea of a standard light. Fine. But we all need to own that light and maintain its power source very carefully. We also then would have the problem of sort of looking at a picture of two light beams, then looking at our own pictures and trying to "double guess" where the new light fell compared to our own.
I cannot attach stuff at present. I wish I could show you two shots. One is Auto ISO 100 F2.8 Lens 35mm shutter 1 second. By chance, although on Auto, it closest shows what I felt I saw. The other is manual ISO 100 F2.8 Lens 35mm shutter 4 seconds. The difference is amazing. Anyone would pick the second shot if they wanted to be persuaded to buy a torch