Can you explain what is the 1/4, 1/6, and 1/8PV wavefront I see mentioned in telescope specifications?
Yes, but it involves a little technical jargon, hopefully, explained in a simplistic way. When any telescope is pointed to a celestial object, it focuses the light to a point where an image is formed. This applies to any telescope regardless of design. The quality of this image is by far the most important feature of any telescope. Without a high quality image, all else is wasted. The quality of the image is usually described numerically by how little error is in it which has been created by the telescope’s optics. The smaller the fraction, the smaller the error and, the better the quality of the image. Now the technical bit. You will notice the letters PV after the fraction. This is an abbreviation for Peak to Valley. This relates to, (for want of a better description), the hills and depressions in what should be, a perfect image. As an example, a 1/6PV telescope means that the image produced has some small errors, the difference from the highest error to the lowest is 1/6th of the wa
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