"Clayton E. Cramer" wrote
I have the JMI NGF-DX3 2" focuser. In order to accommodate more
"out-travel", I believe you can get an accessory extension tube from JMI.
The better method is to make additional holes in the tube for your mirror
mount, spacing them an inch or so closer to the focuser end of the tube. You
would re-mount your mirror cell in those holes when you want to use your
camera. That would be my preferred method as opposed to the extension tube.
Using the extension tube takes the eyepiece further from the secondary,
reducing the sizes of your 100% and 75% illuminated fields to some degree. I
can elaborate more (or confuse you more) if you like. You can figure this
"illuminated field" stuff out yourself by using the NEWT program, seeing
what happens to them when you change the height of the focal plane above the
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