Quote:
Originally Posted by bojan
Hmm..
To my understanding, LCD screen consist of small segments (pixels), which are activated/deactivated and scaled/dimmed to achieve the desired colour saturation and luminance on the area much larger than one segment (pixel).
Also, the filtering characteristics of the LCD pixels are not according to standard, used in stellar colorimetry.
Compared to combination of b/w CCD camera and individual RGB filters (on the rotating wheel) the LCD in the light path (with it's low transmission and pixelisation that will affect the resolution of the image) must be inferior.
Personally, I can't see how this idea could be useful.
Could you give us some more detailed theoretical background? For example, how do you intend to calibrate your measurements?
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If you need calibration, there are RGB sensors with supporting circuit board on eBay that have extremely accurate colour detection capabilities. They are also not too expensive. You will however need some basic electronic knowledge to incorporate and use them. The sensor itself has on board calibration for itself in hardware and software. If I remember correctly they are about $39 and have a 12mm lens port so a standard webcam to 1.25"/t thread adapter can be used to interface with a scope's 1.25" visual/T2 interface. Hopefully they will come down in price eventually soon.
My advice is, if you are going to get one of those webcam adapters. Don't get the one's made from Delrin, they can ruin your CCD, and because they can easily be static charged, minute delrin particles tend to contaminate the CCD with a vengeance. Good quality aluminum ones are more reliable, stronger and in most cases, more cost-effective.
At this point in time the main objective is just colour filtering for simple enhancement of moon and planetary views. Later I will experiment more with spectroscopic functions and the like.
Regards...