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Originally Posted by Dennis G
A question I missed to ask. What is the difference between a EQ 5 and a CG5 mount or put another way what is a CG5 mount.
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The easiest first. CG5 is a GEM from Celestron which is not a sturdy as the EQ6 GEM made by Synta (yes, I know Synta now also makes Celestron gear). The EQ6 is able to carry more weight with less problems than the CG5.
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Question: Using the Celestron 8 inch on the EQ5 (They don't supply a EQ6) and the DMK imager recording into the laptop, can I expect to capture the Orion Nebula for an example?
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I have not used the imager you mention. My DSLR images of M42 on the CG5 were nowhere near as stable as on the EQ6.
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Question:You both write of a carbon fibre tube? Are these available as a standard unit?
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Yes. Andrews have a GSO RC-
8" SDX
...A$2499.00 - a bit dearer than your standard 8" SCT, but lighter and theoretically better optics.
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Question: The Go To facility ... does it require constant manual control or putting it another way , is it stable?
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The GOTO part is for finding the target, and if the mount is set up properly, is reasonably accurate on both mounts. To achieve tracking of the target over longer periods, then drift-alignment is vital to ensure the RA axis is aligned correctly. Manual control is generally not necessary. Many people (me included) use autoguiding to ensure the target stays in place.
Motorised focusser - The one you built for your Dob probably will not work on the SCT - smaller and different focusser.
Cheers