Evening Joe, On 26 Jun 2010, at 00:30, Joe Bauman wrote:
Thanks very much, Patrick, this is great. I plan to build a portable light box that I can put over the end of my scope. Here's another dumb newby-type question: what do you mean by 50,000, etc.? Best wishes, Joe
I don't know what the units of measure are but think of it this way: When there are no photons hitting a pixel the number would be 0 (zero). The more photons hitting the pixel the higher the number until that pixel is holding as many photons as it can. When it gets to that point (holding as many pixels as it can) the pixel is said to be saturated. Another analogy I've heard is comparing each pixel to a bucket. Like a bucket a pixel can only hold so much until it starts to overflow. Each chip has a published saturation point which (I'm guessing) should be listed in the manual. What imager are you using? Clear skies (which they actually are here near SPOC just now), patrick p.s. ~90 minutes until the start of umbral phase of the eclipse.