12" S/C? 14" S/C? Newtonian?
Posted 29 November 2020 - 01:03 PM
All opinions are wellcome!
Posted 29 November 2020 - 01:13 PM
A dob would be a tight fit in a 9x9. For a permanent installation a 14” would be fantastic (on a suitable mount). A 12” makes a wonderful portable system.
Food for thought.
Posted 29 November 2020 - 01:14 PM
It depends on your needs. a newtonian is a simpler design than an SC and you can get a very high quality one (there are lots of premium mirror manufacturers) but SCT's are mass produced, except for the rare-as-hen's-teeth Takahashi TSC225. Many SCT's are of very high quality, no doubt, but you'd still need to get a really good one.
The problem with the newtonian is that it is long and heavy and the eyepiece is at an inconvenient location when mounted on the atlux.
An alternative may be to make a DK cassegrain (e.g. with Robert Royce optics) or buy a DK cass (Takahashi Mewlon). These are generally considered to be optically better than most SCT's and also have the eyepiece at the back which is more convenient like an SCT. The downside is that the Mewlon 300 is very expensive.
Finally, newtonians are generally fast, e.g. f/3 to f/5. So you can get a wide field with them, which an SCT or DK won't give you.
- Bob4BVM likes this
Posted 07 December 2020 - 02:19 PM