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[QUOTE=The_bluester]
You are correct about the reducer vendor and he suggested I machine off the 2.4 mm. QHY are sending me an adaptor that attached onto the OAG and has a M48 interface (it comes with a M54 and M42 adaptors). Machining off 2.4 mm of the flattener is an option if I can figure out how to remove it. I will see what happens. QHY said that 55 mm back focus is not a standard for astro stuff. Both my flatteners demand it. Go figure.
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