Yes, a small ROI presents a challenge for a long focal length.
But there is an easy solution to this within. SharpCap which allows you to manually pan and tilt the ROI to keep the planet centred during the video recording. It is relatively easy to keep the planet centred. The only restriction is that the ROI needs to remain on the field of view of the sensor - not a problem, in my experience when using a small ROI. Alternatively, one can ask SharpCap to do this automatically. Firecapture has an equivalent option.
Quote:
Originally Posted by Mickoid
Something else to consider is that the smaller the ROI, the more accurate your tracking must be to avoid the object drifting out of the region. Otherwise you may have to continually adjust the position of the object to keep it centred in the frame. There's no problem in doing this, it's just a PITA.
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