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Originally Posted by ausastronomer
Dave,
Unfortunately specifying an F5 scope is only specifying 1/2 the equation because we also need to get a handle on the scopes focal length. ie The same eyepiece that is suitable for planetary observation in Andrew Murrell's 20"/F5 is not suitable for planetary observation in a 6"/F5.
CS-John B
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John - my OTA is f5/1500mm
Last night I tracked down Uranus. The view through my GS plossls required constant nudging to keep it in the fov. I found that my 15mm barlowed allowed the best view, with the 6mm being optimum for the seeing conditions. I found it difficult to 'find' the planet when stepping up the mag, through my plossls.
As Iceman and others so rightly point out, a wider fov is more than a luxury when you don't have tracking.
cheers
Dave #17