I've been using my barn door trap for a while now yet im having an issue with it.
I get the tripod levelled and polar aligned (green laser at Polaris) and start it up.
What I'm getting though is a few spot on images (over 20 to 30 second exposures) then an image or 2 with really elongeted stars then back to spot on images.
This happens randomly so I end up chucking as many images as I'm keeping.
What could be a possible cause for this? I use
I'm going to build a new one soon anyway yet im interested to understand why this is happening.