Hi Mark,
I owned an MK-67 Deluxe and liked it. Then I bought an MN56 and following that an MN76. Loved them! The MNs were a world ahead in terms of planetary performance and had great widefield low-power performance as well. The MNs were sharper on everything I aimed them at. Sold the MK and ultimately both MNs too. I wish I still had the MN76 and actually considered the MN86.
Downside:
MNs - longer tubes, weight, larger mount needed, focuser
MK - very narrow Fielf of view, larger central obstruction, very critical collimation
I owned an MK-67 Deluxe and liked it. Then I bought an MN56 and following that an MN76. Loved them! The MNs were a world ahead in terms of planetary performance and had great widefield low-power performance as well. The MNs were sharper on everything I aimed them at. Sold the MK and ultimately both MNs too. I wish I still had the MN76 and actually considered the MN86.
Downside:
MNs - longer tubes, weight, larger mount needed, focuser
MK - very narrow Fielf of view, larger central obstruction, very critical collimation
