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Message: <blockquote data-quote="TwistedThrottle" data-source="post: 823647" data-attributes="member: 46724">Hi [USER=53543]@PhilD41[/USER] and welcome!Is this the only time it has happened?  From what I can tell from your screen grab, focus doesn't appear to be an issue and the stars look to be well defined without streaks but 300mm is quite a reach for long exposures.  Any anomaly between you and your target will be multiplied, so a thin little wispy high cloud you cant even see naked eye, city lights washing out the stars (light pollution) or even the vapors from heat haze has an impact.  You might want to check out ClearDarkSky dot com for some additional insight.  They have charts that break down night time visibility and let you know when the optimal time to expose for astrophotography is.</blockquote>