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OP...
Pro's:
- compact size compared to say f/7 8"Newtonian
- buckets of magnification, which is great if you are into lunar & planetary;
Cons:
- small field of view, terrible if you want wide rich-field views this is not for you*;
- tube currents will degrade the seeing while the scope cools down. But when it does cool down an f/15 mak is fantastic, far better than any SCT.
Lastly:
- rethink your eyepiece collection to suit the long focal ratio. I have a 180mm f/15 Mak and my eyepieces range from a Vixen 2" 50mm (lowest power) - this a huge hunk of glass the size of a half a house brick. In average seeing I can use a 13mm eyepiece, if the seeing is good I'll try 8mm and on really exceptional nights 5mm (maybe once per year).
*my solution is a side-by-side mount with a 102mm f/7 refractor to provide rich field views. With a focal length around 1/4 that of the Mak, it is an excellent "super finder".
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