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I just did a quick calculation and if I understand correctly the focal length was equivalent to 12,000mm and your camera is 640X480 with 7.4 micron pixels, then the field of view is 1.44X1.14 minutes of arc. That is 0.024X0.019 deg. That is very amazing! What resolution would you estimate you are getting Bird? No wonder a 0.5 deg temperature variation has an effect.
Bert
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