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Geoff - I bought a Bintel (GSO) 2" Quartz 99% reflective dielectric unit for $120 at SPSP for one of the WO 66mm refractors I have, which uses the SCT thread. The standard version has a straight barrel with a light groove - but not a deep dished one like the WO. It performs very well by all accounts, and if anyone can honestly tell the difference between it and my other - a WO, I'm a monkeys uncle.
Cheers
Chris
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