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Hi Rex,
Congrats on the new setup!
You won't regret the 8" f/4, they are a powerful tool in AP.
Most of the double diffraction spikes is from slight twisting in the veins.
You can straighten them out easily with your fingers, slight pressure is all that's needed.
It's usually easy to see which are twisted just by eye.
Other double diffraction spikes can be from very close doubles.
Cheers,
Justin.
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