Quote:
Originally Posted by gregbradley
That's not surprising due to PE of the mount. It affects the subs less in shorter subs. I would put it down to that.
I have noticed sometimes focus subs can be more hi rez than longer exposures due to PE.
Greg.
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Thanks Greg. But how does that work exactly - do you think the guide points of our mounts wander about over periods of minutes? (genuine question not sarcasm). there does not seem to be much change in star shape, so the effect applies in both axes - and there is no PE in dec.
Does this mean that, if we can use shorter subs, we can get sharper images?