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Yes they are Maks, I'm not sure what is available in focal reducers for these scopes.
Looking at Meade reducers made for their SCTs, (f10), a 6.3 reducer with a Mac would tend to give f 9.45 or thereabouts, still too long for all but the best setups for DSOs. An f3.3 at f10 (33%) reducer would give around f4.95, however the problems are or could be legion.
The actual reduction ratio depends on the back focus distances which with SCTs and Macs, varies greatly when focusing due to mirror movement. An F3.3 (33%) reducer might well also have significant vignetting too.
We really would need to hear from a MAC user, I'm only raising issues that might be detrimental to pleasing DSO imaging and suggesting alternative pathways.
Doug
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