Field curvature in Hyperion zooms?

[GazOC]

Has anyone reported any problems with this? I had first light with the zoom in my f5 refractor last night and the field curvature was quite pronounced with the zoom at 24mm and progressively less down to (say) 18mm-12mm or so where it pretty much disappeared. I was hoping to try the eyepiece in a larger focal ratio scope to see if that was a factor (is field curvature affected by focal ratio/ length? ) but the clouds beat me to it.

Has anyone else got any experience with this eyepiece? I know f5 can be fairly demanding on eyepieces over a number of aberrations and if thats the deal with the eyepiece at f5 then fair enough but if somebody could just put my mind at rest...

[GordonCopestake]

It's fine for me at f/10 (SCT) but that doesn't really help you

[GazOC]

It's fine for me at f/10 (SCT) but that doesn't really help you

It does mate, if mine still shows curvature at f10 I'll know there may be a problem.

[GordonCopestake]

Should be fine in your 10" but that being said I dont really notice the curvature in the pan24 and others hate it cause of the curvature :shrug:

[James]

My zoom shows some quite pronounced aberrations at the 24mm setting in my f/4.7 Newt which improve as the focal length setting decreases, pretty much disappearing by the 12mm setting. It's much less of an issue in my f/8.3 refractor. I find the field curvature is the more pronounced aberration, more so then astigmatism.

Like Gordon though I don't notice any curvature in my 24mm Pan so I guess I'm not hypersensitive to it...

James

[stargazer1980]

I was kindly lent one of these EP's at kelling and tried it out in the megrez 90 and didnt seem to notice anything out of the ordinary! I know its most prob no help and im no expert!

Just thought youd like to know!

Darren

[GazOC]

Thanks a bunch James, that pretty much what I found at f5. I'll try and give it a whirl in a longer f# scope later on tonight.

[GazOC]

Cheers Darren, what f# is that scope?

[GazOC]

I just got from a great nights observing and the eyepiece is pretty much faultless in my f15 Mak, sharp right to the edge. I'd guess f6-f8 is the grey area for this eyepeice.