I put the PST-BF5 back to the visual back, screw the etalon module in again, for what purpose?
Actually, I've rotated the PST etalon module, just to test its range, however, I found my action probably knock it out of optimal, so I screwed it back tonight, when the sky clears again, I shall check it's optimal position, keep it there and re-assemble the tuning ring back for further use.
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