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Originally Posted by Miaplacidus
Yeah, a push in my F6, too. (Seagulls refers to the distorted shape of stars in the periphery of the field, prinicipally due to coma and most noticable in "fast" newtonians.
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Hi,
With these cheap Chinese eyepieces, like the 26mm GSO Kellner we are talking about here, the predominant aberration is off axis astigmatism, not Coma. I have used this eyepiece myself in an F5 scope and it is terrible.
FWIW, Coma is an aberration eminating from the fast mirror itself not the eyepiece. The astigmatism you are seeing in this eyepiece is caused by the eyepieces own inability to handle the steep light cone (fast scope) away from its central axis.
CS-John B