With astro shots, watch your shutter speed! The moon obviously moves across the sky relative to your fixed location on the earth's surface. High magnification with very long focal lengths or through a telescope also magnifies its motion across the film frame. Too long a shutter speed will blur the moon's details from this motion. The alternative is an exceptionally accurate tracking using an "equatorial" mount with analog drive exactly matching the moon's angular motion across the sky that has been very carefully aligned to the combination of earth rotation on its axis and the moon's orbit. How long a shutter speed you can get away with from a fixed tripod depends completely on lens focal length (how much you are magnifying the moon and its motion).

What looks like blur can also result from dew forming on the lens objective. Doesn't take much to fog the whole show! I use a deep lens hood and if I'm out for a while very late at night I will check the lens front for dew formation. Astronomers either work from a dome with aperture (one of the reasons for the dome) or will use a "dew shield" .. . a form of hood that warms the air in the hood very, very slightly to keep it two to three degrees above ambient (too much heat creates convection currents in the air that cause blur).

If you haven't guessed it already, setup for astro photographs requires time and patience ... skill at reliably getting good photos comes with some experience doing it. #667446

Regards
Ivan Clife #1350049