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Originally Posted by Roger Davis
Didn't think there was such a beast as a high power planetary/DSO eyepiece. DSO's require aperture not magnification.
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Roger,
Thats a comment I wouldn't have expected you to make, its clearly incorrect in a lot of cases IMO.
There are countless DSO's that are best viewed at higher magnification given the aperture available. Numerous Globulars, Planetary Nebular and Double Stars all "can" provide "better" views when viewed at medium/medium high power. As you would be well aware, many planetaries appear almost stellar until you crank things up a bit. The Homunculus is a classic DSO target that is better viewed at high power.
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Originally Posted by Roger Davis
The higher the mag the dimmer the object through light loss.
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That's true, but don't forget that as magnification is increased, contrast is also increased, up to a given point where light loss causes the target to become too dim. That isn't an issue in a 9.25" scope at the magnification we are talking here and the targets I think Glenn is planning too observe.
I think Glenn actually described his requirements perfectly, indicating that he wants an eyepiece that gives him enough power for lunar/planetary viewing, but could also be used for observing DSO's at those powers. Consequently, a wider AFOV would serve him better when combined with the longer focal length/narrow FOV of his SCT, than something like an orthoscopic or plossl which are not as suitable for high power viewing of DSO's in a slow scope.
Granted, anyone that plans to work mainly on DSO's requires a couple of premium low/medium power eyepieces, they also will require something that gives good quality views around 200X and that is exactly the range Glenn (ziggy) is looking too purchase something.
CS-John Bambury