Quote:
Originally Posted by glend
The advantage of SCTs is their compact package long focal length. Even a 8" Edge HD will give you 2000mm of focal length with nothing added. Stick a 2x Barlow on and your at 4000mm, which many consider a good focal length for planets. Planetary imaging can be done without a flat field (assuming your using high frame rate video stacking and your mount can track reasonably well), so a stock 8" SCT can do the job.
Other than SCTs you could consider long focal length achromat refractor. Any f12-f15 refractor with a 2.5x Barlow can get you good views, images, of the planet's with minimal CA. Have a look at the Bresser f13 achromat sold by Teleskop Express in Germany.
https://www.teleskop-express.de/shop...-Assembly.html |
I don't want 8" SCT, not even 10" or 11" SCT, simply because i have a 7" Mak which gives 2700mm natively, but it has f15, and still i find it not enough at all, i want a scope that can give me something lime 4000mm-5000mm at f10 or faster, or even f15, but not 2000-3000mm f15, i used Tele Vue 3x with my Mak to give me 8100mm but at f45 and it killed the exposure and also details, i don't have 2x but i will buy Powermate 2x then i will try again, that is why the only SCT i really think about is C14 or 14" SCT even from Meade or larger, and those are too much heavy which needs another mount, and for this reason i can think about heavy dob then which will give me something around 1600mm-2000mm at f4.1/f5, then with Powermate such as 4x or 5x i can be at f18-f25 with FL about 7000-10000mm, so more FL than SCT and also faster.