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Originally Posted by chunkylad
I have to agree with Steve: my example is also lousy at F5. Same experience with the barlow and those nasty little sea birdies. Even my 2" GSO 26mm plossl is better, which is a bit of a dissapointment. 
Dave W |
Dave,
I have not used the 26mm but I have used the 32mm 2" GSO Eyepiece. They are not plossls they are Kellners (I pulled it apart to find why it was so bad). I can say that the 32mm was sooooooooooo bad in my scope that the 30mm GSO Superview was in an entirely different league. That 32mm kellner was unusable from 40% off axis.
What this leads me to, is that there must be a large amount of quality variation amongst these cheaper eyepieces and not only from GSO, others as well. I am a pretty hard marker with edge performance and my 30mm GSO is good for 70% to 80% of the FOV and useable almost to the non existent field stop. I consider this to be exceptional performance considering the price. I also compared it against a University Optics 25mm MK70 at F10 in a Celestron C8 and at F5 in my own scope and it had better edge performance in both scopes. Rod's 30mm GSO was only a TAD behind mine and quite good. I have also used the 2" 30mm 1rpd in my F5 scope and I put it in the same class as the 2" GSO Kellners, terrible. I would rate the 30mm GSO Superview at 75% to 80% of the performance of my 27mm TV Panoptic.
I can only assume that not all 30mm GSO Superviews are created equal and its a lottery as to whether you get a good sample or a bad sample.
CS-John B