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Old 23-04-2021, 12:02 PM
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alpal
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Join Date: Jan 2012
Location: Melbourne
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Quote:
Originally Posted by Emuhead View Post
Labouring this point.. so an 8" mirror can only ever give the same resolution, regardless of whether it's an f4 newt, or an f8 RC, or an f10 SCT, or any of the above with reducers or paracorrs?

The magnified result (determined by the f ratio) will only just increase the size (much like an eyepiece does) without providing any more or any less detail, so it wouldn't benefit me to look at any other 8" scope & expect more detail (unless I've been incorrectly sampling but with 3.8 micron pixels (around 1 arcsec/pixel) i think there's not much to be gained by going with smaller pixels) so i could consider the case closed.

Thanks all



3.8 um pixels will be slightly oversampling but that's OK.
It all boils down to what kind of seeing you'll get in Melbourne -
it's normally 3 to 6 arc seconds -

or consider some other place if you try imaging there.
Given that Mount Macedon can sometimes give
2.2 arc seconds of seeing then the longer focal length scopes would
give you some more detail or resolution.


Using a 10" f4 Newt. -

some of my examples from Melbourne are here:
https://www.flickr.com/photos/247194...in/photostream


and a crop using 3 x drizzle
https://www.flickr.com/photos/247194...in/photostream




cheers
Allan
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