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Narrowband

pike

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  1. Thanks Olly. What I referred to as excessive magnification was the image size presented by telescope simulators such as Telescopius, when using a large focal length scope and various DSLR and astro camera sensors. This appears to show image size has an inverse correlation with sensor size for a given focal length. As such the focal length is the determining factor. This then suggests that a scope such as my 8SE with its large focal length is sub-optimal for all but the smaller DSO's. However that is by definition unlikely to work with the alt-az mount and field rotation This and the fact that the 8SE is almost at the mount's weight limit and the conclusion I draw is that using an 8SE for this purpose is a bad plan. This is especially the case as I did also consider a piggy-back mount to carry a camera on the 8SE. I did buy the 8SE for visual use so all is not lost. The next step is to look at alternatives or perhaps try a camera, alone, on the mount and see what can be achieved.
  2. I've used my 8SE for viewing and now want to try astrophotography. I'm looking at ZWO cameras and would like to be sure that these make sense with the 8SE with its 80 inch focal length. Looking at Telescopius with some ZWO cameras shows an excessive magnification for some typical DSO's. Does this need some kind of focal length reducer, or is a lower focal length scope required? I appreciate the supplied mount with the 8SE isn't the best for this, but I'd like to see what is possible.
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