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Old 22-04-2021, 10:43 AM
Emuhead (Andrew)
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Emuhead is offline
Join Date: Oct 2019
Location: Melbourne, Australia
Posts: 194
Appreciate the responses.

The penny dropped finally on the seeing limit, that FWHM example really helped. So in Melbourne, even if i could get down to 2 arc seconds i would only need a fairly small aperture (70mm) to max out the detail level. Then it's down to f-ratio to determine the magnification & brightness of that image (given same sub exposure time).

So anything greater than about 70mm of aperture isn't providing more detail, it's simply allowing for a brighter & more magnified image potentially.

Or have i missed a few things? Just trying to find a scope that will give me highly detailed up-close images that'll suit my mount.

Last edited by Emuhead; 22-04-2021 at 11:13 AM.
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