Unless you got on the notification list in 1999 or EARLY 2000, you can forget the AP 10" Mak-Cass. You will never get notified. Never.
I got on the list in mid-2001, and I have given up hope.
Don't give up hope. If you want one, watch AM and be ready to pounce.
I have collected two rare big maks because the first owners are now too frail to manage them, and decided the time had come to sell. And I have 10, maybe 15 years before I too will either sell them or pass them on to my son if he is interested.
By way of example, Santel produced just 28 of their MK91 maks. These clearly were a "labour of love" not a serious business proposition - and the AP 10" maks are no different. Now, after Santel folded, apart from mine I know of just 3 others in regular use. What happened to the rest I have no idea.
A similar pattern will happen with the AP 10" maks, too - and those who signed up are now 20 years older.
- most will pay and receive their scope but will have to sell within a few years due to ill-health; and
- a few will be sold as part of a deceased estate.
After the production run finishes, over the next 10 years perhaps 10% will come up for resale. But 80-90% of these scopes will vanish, never to be seen again.
FWIW regarding the comparisons with premium big refractors, the really tough nut is the Dawes criterion for double stars - where 80X per inch of aperture may be required to split close doubles of unequal magnitudes. Few modern refractors can do this, and some of the high-end maks do - my MK91 does, as does an Intel 715D that a good friend has. My guess is the AP 10" maks will achieve this, also.
Beyond 7" aperture though, the big refractors have a problem with chromatic aberrations laterally and longitudinally, whereas the big maks do not, and in this respect I suspect the refractors are frankly overrated.
Showing Phobos and Deimos with Mars in the field is interesting but my MK91 can do that, it is hard but I don't read that as a really tough test - a good f/7 8" Newtonian will do likewise.
Ultimately the big premium maks are astronomical unicorns ...
- many have heard of them,
- some have actually seen one,
- a lucky few have had the chance to look through one,
- a few understand what these beasties are capable of, and
- a very privileged few actually own one.
Edited by luxo II, 07 December 2018 - 09:13 AM.