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Originally Posted by fredt
Thanks for the quick feedback.
Yes F5 newts tend to be a bit more fussy I guess. I was a little concerned about lack of image at sirius-optics. Sent them an email to see if they'd post pics so maybe get to see them.
I think my main use for this EP is to be able to scan skies a little more easily to find objects and then use other EPs to get close. Just how bad are they at the edge? I guess that's a bit subjective. That one on Ebay looks pretty good Joe. Very similar to the Astroshop product.
Don't want to spend up too big at this early stage. Still getting an understanding of what will suit.
If I posted a "wanted" ad MortonH, do I just do it here or is there some specific ads section on this forum?
Thanks again all.
Fred
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Fred,
I think you need at least 5 posts to post an ad.
People who know each other also loan eyepieces to try out before buying from another source. But you are just too new to the forum for me to risk sending you an eyepiece.
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Just how bad are they at the edge? I guess that's a bit subjective.
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Yes it is subjective. Moreton has used in in a scope like yours and thinks you might only have a decent image in the centre 50% at f5. It is a gradual change to poor images not a hard edge. You'll probably have the stars looking like little seagulls in flight.
If you had an 8" SCT I'd say go for it but I think you might be better off going for a better corrected eyepiece, maybe not a $900 Nagler but something in between.
If you are going to use it like a pseudo-finder, it might not matter or you can use an aperture mask to stop the 8"f5 down to a 5"f8 while you search. You'll lose 1-1.5 stops of light but probably have a wider usable field.
Joe