Quote:
Originally Posted by Paul Haese
Sorry, but this has got to be one of the biggest urban myths in astronomy.
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I disagree.
Quote:
Originally Posted by Paul Haese
........... Use active cooling on your scope Peter and you will see the difference.
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Yes, I also use active cooling on my scope...plus have an extractor fan in the dome so air is always being pulled in via the observing slit.... thermal control is indeed important!
Mark's remarks on SUSI are a great example and typical of my experience with different aperture instruments....*when used for imaging*.
A lot of work was done by Kolmogorov who quantified the spectrum of turbulence.
A small aperture will typically only be looking through a small part of the wavefront distortion, which has a small image distortion but a larger positional shift at the focal plane than that seen by the larger instrument- which sees just the opposite: stable position but with more distortion.
Hope that makes sense...
