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focal length of finder scope?
Hi all
I have a Bintel branded right-angled finderscope (GSO?) converted to a guidescope. It's now straight through with about 40mm of spacers to achieve focus attached to a ZWO ASI120MC-S.
I've fed 185mm into PHD as a focal length. Is that about right? How can I tell? I'm trying to reduce the variables in the guiding equation as the results aren't ideal.
Andrew
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