This group is for owners and people who are interested with the Santel Maksutov's MK6, MK7, and the MK91. Anatoly Sankovich is the owner of Santel that was created in 1998. Anatoly uses a advance Rutten Maksutov design or RUMAK in his maks. Not only the secondary mirror is adjustable but the primary mirror is fixed. Focusing is done only by a crayford type focuser. This design keeps optical alignment very well because there is no movement and no image shift of the optical train.