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Nice one Doug. Those long plumes are wonderful. Long sessions, but necessary in the burbs with a DSLR. I like the round stars too, but find that they become too bloated with aperture wide open. At f/3.2 the 200mm goes spiky, but there is more control over bloat. And, to get proper exposures with the sodium filter 5 minutes or more is necessary, preferably 6 to 7 minutes.
Maybe an O ring behind the rear lens would reduce the spikiness of the Iris. It's a thought.
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