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Hi Lester
You may be either out-of-focus or suffering severe lens aberration, or both.
Try stopping the lens down, in steps, to f8 taking individual exposures and see if the stars are any tighter. If they progressively get tighter from frame to frame, until they appear perfectly focused at say f5.6 of f8, then it looks like the lens cannot be used wide open.
This is probably okay, as an f1.4 lens will be severely tested using pin point star images, so it may not indicate a “bad” lens.
Cheers
Dennis
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