Quote:
Originally Posted by rogerg
Interesting, must make some difference. F4 compared to F6.3 certainly wood. Thanks  |
Yep, and even at f4, the movement of stars in ratio to f6.3 is still in sub arcseconds. You would have to get down to about f2 before guiding may start to become inaccurate. The stars would still be guided in small to sub arcseconds, but ratio would let it down. In reality the stars would be moving in large arcseconds, which still should be ok for minutes of imaging, but risky for hours.
Arcseconds won't change but the
scale of movement does.