I find that if I go to ten minute subs I get very short star tails, what can cause this?
Background to question:
8" imaging newt, Canon 450D, 60mm guidescope and ASI130mm guide camera, running Metaguide; mount is NEQ6Pro (fairly new one), polar aligned before starting at 0' 0" both alt and az. Baader MPCC Mark III Coma Corrector
Example, imaging NGC55 at a dark site (Bretti) I was running ten minute subs. Metaguide graph looked good. This was the first attempt at running longer than 5 minute subs. Initial test subs looked good in Liveview.
Back home, after bringing into Photoshop and enlarging slightly I could see short star tails that were not apparent on the camera screen nor until enlarged (these are not coma but short straight tails).
Is there any way to clean this up? Is it a mount limitation? a Metaguide setting issue? Any advice appreciated.
