[Wavytone]

Hmm.

But you paired the mono with an f/7 scope plus a Barlow, which defeats the point of using the mono. May as well have been looking through an ordinary 5mm such as a Plossl.

Would have been better with a longer focal ratio scope such as an SCT or mak - with no Barlow - and compare with other 10mm eyepieces with small numbers of elements and air glass surfaces elements such as a plossl, or ortho.