Fred,
Do you have any images which show the effects of mirror slop/ flop? I'd honestly be interested in recording it.....
If you're using an OAG and the mirror DID flop....how can/ could the guiding software make a fast enough correction to stop it showing in the final image???????
( I use a 25 -30micron slit on the spectroscope and have to obviously keep the star on the slit....so far in all these years with SCT's I've never experienced a mirror movement which caused the star to "jump" off the slit....maybe I've been lucky??)
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