Quote:
Originally Posted by SimmoW
wow that's great useful advice Ray, thanks for posting.
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+1 above - thanks Ray, that's an excellent summary - appreciate the time you took to post this (I'm a big fan of your galaxy work!)
Quote:
Originally Posted by Shiraz
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1.5m fl, that will work on an EQ6 - you could consider:
- an 8 inch f8 RC with field flattener (will take a long time, but give best resolution)
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Yep, was heading down that path, but missed out on one in the classifieds
still, they're not too expensive new at around $1k, and 1200mm is great, but f8 is VERY slow, maybe even too slow to get sufficient data in one night at a dark site (I don't often get to one, so I would want to make the trip worthwhile)
Quote:
Originally Posted by Shiraz
- a vastly expensive APO refractor
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I really do like refractors, but a quality 120/130mm +/- 900mm FL, well - yes big $$$
Quote:
Originally Posted by Shiraz
You could consider a shorter scope and use drizzle to recover some of the detail lost in sampling. Then suitable scopes would include:
- an 8 inch f5 Newtonian with coma corrector
- a 10 inch f4 CF Newtonian with CC (on the weight limit for the EQ6)
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Yes, probably the most sensible, logical solution
Although cumbersome and prone to wind issues
Quote:
Originally Posted by Shiraz
- a 7 inch Mak Newt (also a bit heavy)
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I'm very curious about these.
Around $2.2k for the MN190 or there's a Russian one for sale under $2k in the classifieds, f6 too - hmmm no diffraction spikes either ...
Quote:
Originally Posted by Shiraz
Whatever you get will need a good digital focuser - my CF f4 Newtonian needs refocusing (by SGP) about every 10 minutes in typical conditions.
Cheers Ray
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MMM, this is new territory for me - I typically set & forget focus at the start of an imaging run with my two refractors. Motor focus will require imaging with a PC (I currently use a mac for everything, I've never used a PC
)
But you certainly have given yet more food for though, many thanks indeed
