I had my newly purchased Orion Argonaut/MK67 out for a test run tonight and using a generic 2" to 1.25" reducer and a standard 1.25" Televue diagonal I ran out of backfocus before Polaris could be brought to focus (using a 30mm and 16mm plossl)...I could almost get it if I backed the diagonal out....any suggestions??..most of my EPs are 1.25"....thanks...John
MK67 diagonal
Started by John F. Powell, 02/21/2004 07:20AM
Posted 02/21/2004 07:20AM
Opening Post
Posted 02/21/2004 05:13PM
#1
My Intes MK67 behaves similarly. Most recent-vintage units were designed to accomodate 2-inch diagonals. As such, most 1.25-inch diagonals are "too short" to reach focus in a typical set up.
An extension of some sort will allow you to reach focus just fine. If you have a short Barlow -- one with a removable lens assembly -- it should do the job. Simply remove the lens assembly and install the Barlow between diagonal and eyepiece (or adapter and diagonal).
Orion also sells extension tubes (both 2-inch and 1.25-inch diameters) which back things up 2 inches. I'm sure Anacortes offers similar items.
A 2-inch diagonal might also accomodate focus -- depending on how much (or little) "reach" your particular Mak needs.
Hope that helps.
Best wishes and luck.
-Dan
An extension of some sort will allow you to reach focus just fine. If you have a short Barlow -- one with a removable lens assembly -- it should do the job. Simply remove the lens assembly and install the Barlow between diagonal and eyepiece (or adapter and diagonal).
Orion also sells extension tubes (both 2-inch and 1.25-inch diameters) which back things up 2 inches. I'm sure Anacortes offers similar items.
A 2-inch diagonal might also accomodate focus -- depending on how much (or little) "reach" your particular Mak needs.
Hope that helps.
Best wishes and luck.
-Dan
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