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Hi Stephen
If the FOV is only 10 arc minutes identifying the stars will be almost inpossible. You will need at least 30 arc mins FOV to get a recognizable view and that star in your picture is hardly likely to be Sigma Octans.
To calculate the FOV I need the focal length of the telescope F10 gives nothing about focal length just the ratio of the aperture to the focal length. I need one or the other to find the focal length.
With the tucam I need the chip size to calculate its FOV when coupled to the telescope. However at a guess I would expect from my experience the FOV would be about 1/4 of what I see using a 26 mm eyepiece and you would get about 9 arc minutes FOV if it was couple to an 8" SCT of the Meade or Celestron size.
Barry
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