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Hi Jimmy,
You're not giving us much to go on. As Rob said, post an example.
how did you focus?
did you turn off autofocus?
or could you have possibly moved the focus?
Barring something screwy with DCU processing, focussing is the most likely problem. It probably isn't astrotracer. I use astrotracer. You get short streaks towards the edge of frame because the function doesn't trace perfectly. But not golf balls.
Focussing
Turn off AF
Use live view
point the lens at a bright star, Sirius, Canopus or Alpha Centauri. Use live view on maximum magnification to view and focus the image. If the stars are not perfectly focussed, they won't be visible until they come into focus.
After focussing, do a quick test exposure 2s and make sure the bright stars are focussed.
Astrotracer
Makes sure you do the precision calibration carefully rotating the camera in all 3 axes.
Keep exposures short < 2 mins for a 50mm lens. Better to stack afew exposures than to over do one exposure.
I took the attached image with astrotracer, processed in Lightroom cc and Photoshop cc. It is a stack of four x 2 minute exposures, all taken at ISO3200 with a 50mm f5.6
Good luck
Joe
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