Nice work. With infrared some lens develop hot spots and reflections and others don't. I think it can be a matter of trial and error. You seem to be getting some lens reflections there. If you have another lens it might be worth trying that out as well.
I did some with a Fuji XE1 and the standard 18-55 zoom gave a hot spot but the 35mm F1.4 did not.
Greg.
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