Quote:
Originally Posted by rmuhlack
Rather than moving the primary or focuser to fix the offset, can't you just install a spacer of some sort between the spider and the secondary holder to move the secondary closer to the primary?
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Hi Richard,
Apart from introducing cantilever changes in angle causing instability -
moving the secondary mirror down towards the primary will
change the point at which focus is found.
That point is now setup so that focus in my camera
is achieved just as the coma corrector enters the inside of the tube.
I am experimenting with different designs here:
https://stellafane.org/tm/newt-web/newt-web.html
cheers
Allan