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Kevin Legore of SW USA did once fully describe the collimation issue with the early batch (now all pulled). The spacer ring interference in the optical path is the reason why SW USA now fully test each Esprit before sending them to customers. It is uncertain if all the newer model have the one piece continuous spacer or not ex factory. They should be.
Regarding halation, it is VERY subtle. When the say SW vs AP images are compared, the Esprits show a very minor degree of halation. Very acceptable amount in fact. All Esprit images are also warmer toned.
All in all an excellent telescope series. I almost bought an Esprit 120 but went for an FSQ instead.
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