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Old 29-11-2007, 04:37 PM
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g__day (Matthew)
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Join Date: Dec 2005
Location: Sydney
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If a 127mm MAK is the autoguiding OTA - what CCD would you recommend?

Interested in folks opinion here. I wanted to try guiding my C9.25 with a longer focal length tube, so I switched from a piggy backed 80mm refractor (focal length 480mm) to a Meade DSI to 127 mm / 1500 mm focal length MAK into a Meade colour DSI.

One problem is now stars are huge! Rather than be near pin point for example Canopus last night via PHD on a 3 second frame grab cycle was about the size of a pea! Say 3-5 mm across. I am not convinced PHD can find the centroid of this star accurately - especially as atomspheric effects kick in.

I am really trying to nail autoguiding better - so any suggestion would be much appreciated. The mount, Losmandy bars etc - have the capability and rigidity, its a permamnent set-up - so my next target is a CCD better suited to the 5" MAK.

All thoughts and suggestions greatly appreciated!

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