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guiding
Hello Ryan,
As many many people have said, long focal length, moving primary mirror and flexure are only addressed with an off axis guider.
For me with a Mewlon 210 (2145mm focal length) on a HEQ5 PRO the only way I could get guiding was to use an off axis guider. Guiding with PHD2 produced round stars. I use an Orion thin off axis guider.
But the scope was too heavy for the mount (in my opinion) so I upgraded my mount but I use the same guiding setup.
Startrek as recently achieved arc second guiding on a Synta mount by careful attention to PEC correction (I seem to recall that he used the PEC function in PHD2).
Just thoughts
Chris
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