Quote:
Originally Posted by Merlin66
Over on the Yahoo Stark labs group, there has been some interesting discussions on guide focal lengths v's imaging focal lengths.
With PHD it comes down to arc sec/ pixel for both systems, and the general suggestion is that the ratio between them should be "optimised" around 5...this means if your guider camera is seeing 2 arc sec per pixel then this would be good to guide your imager at 0.4 arc sec per pixel.
You can use the CCDCalc freeware etc. to get the various numbers.
HTH
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Hi
any more info on the relationship between the imaging and guiding scopes and the cameras? mine is an 8" F4.
I'm looking at setting up an autoguider as well. I have a meade 9 x 50 finder and an orion st80.
I won't be visiting dark skies that often so will have to make do with either the finder or the st80.
anybody tried using a light pollution filter for guiding from light polluted areas?
I've been thinking of the qhy5 or the orion st4.
will an adaptor be required to use the cameras with a finder? are there generic 1.25" adaptors to use with the st4 or the qhy5?