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What is this?
The attached two images were taken in the same part of the sky in Leo. They are 100% zoom and cropped. Image 1 was taken tonight (Thursday) and image 2 was taken last Monday, three days ago. Image scope is a Skywatcher 100mm APO, Camera = Canon 60Da. Shots are 450 second ISO 800. Image 1 is showing what appears to be chromatic aberration. I double checked the focus in case it had drifted out and also used a Bahtinov mask to be sure. The sky looked reasonably transparent but it is possible the seeing was out as the stars were twinkling quite a lot. Nothing has changed in the imaging train in the three days between the shots so I am a loss as to why these orange halos have suddenly appeared. I checked the dew heaters and they seem to be working OK and there was no obvious dew on the lens. Sensor temperature tonight was about 7 degrees where on Monday night it was about 12 degrees.
Any ideas?
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