Quote:
Originally Posted by DavidU
How did you spot that Bert? Amazing find. Were you nova searching?
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David if you have two images that have the same exact field and size by alternating or blinking as it is called, any difference just jumps out. You must then check to see if the difference is real. It was a bit more difficult with these two images as one was taken with a 300mm lens and the other with an FSQ106.
Here is part of the two images in an animated gif 1.3MB
http://d1355990.i49.quadrahosting.com.au/2009_10/ab.gif
Here is Terryb's image alternating with the FSQ image. 1MB
http://d1355990.i49.quadrahosting.co...09_10/varD.gif
I use Registar to produce these images. I always try to compare images taken at different times to see if anything is changing. The great thing about dslr images is they have a timestamp so if anything turns up you have the info.
I don't do any systematic searches but keep an eye on the images I do take in case something obvious turns up. In this case I guessed it was a variable and I was sure someone on IIS would know more than me to identify it correctly. Terryb has done just that.
Bert