[Wavytone]

Well of course they suit an SCT - the field curvature is a fair match for that of the SCT which is concave towards the sky, like a refractor. And Alex does have an SCT as well as several dobs.

As he said he has a fair collection of eyepieces that has evolved to some extent by "suck and see, flog what doesn't work", as well as trying those I've had over the years.

Eyepieces should be matched to your scope AND the observer. There is no single "best eyepiece" for all scopes/observers.

The hardest part is that manufacturers do not disclose the field curvature of the eyepiece, nor its off-axis correction (monochromatic aberrations as well as lateral colour).

For example its pretty clear Televue eyepieces designed to suit dobsonians - the main market in the US, whereas in Japan and Europe most scopes are refractors 80-130mm aperture. If they at least disclosed the field curvature this would be a huge help. You can see this on Cloudynights (predominately US users) where the answers to almost every question are (a) buy a big dob, and (b) buy a clutch of TV eyepieces.

Vixen's eyepieces OTOH were aimed primarily at refractors (and suit Maks and SCTs too), though the LVW design is quite old - older than TV Naglers BTW. The LVW series were rebranded, mainly by Orion.

FWIW Hyperions were an inferior copy of the LVW series, though popular because of lower cost than the LVWs; as are the cheaper Stratus (also inferior).