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Hi Chris
I don't think you should be getting star trails at 4 secs with a 50mm.
A couple of years ago, i did this image, using just a 50mm F1.8, albeit with a Nikon D7000.
I think i used 10 sec subs at about ISO 3200 or even 4000.
I think i even stopped it down to F4 to avoid the coma, which you can see in yours.
Then i used DSS to stack, and it said there were thousands of stars, although this is a busier part of the sky i guess.
Keep trying though. You can get some great results with just a tripod.
Cheers
Bob
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