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Thanks Gary, I'll try the tracing paper tonight - weather permitting, and get back to you with the measurements.
I tried focusing with the camera late last year but only got a faint halo.
Thanks Dave, good to know about the sagging of the low profile focus tube. I hadn't thought about that. The blue looks really good.
Just the thought of going near the tube with an angle grinder sends shivers down my spine. Angle grinders hate me for some reason.
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