They look like Meade 5000 SWA's (though I don't own one to compare). The rumours are, Meade made a large order of them, but with the current financial problems, they could not pay for it. So they are now sold unbranded (or rather branded as Maxvision) for discount prices. Once sold, they won't be available any more (though few shipments are still on the way, some of the "out of stock" may yet come back). If true, these might become unique items :-). There are only some focal lengths available (for 82° only two actually), which seems to support the rumours. They are quite big and heavy, esp. the 2'' versions, so I stayed with 1,25'' barrels only. You can check the Meade 5000 SWA's here:
Meade 5000 SWA
The eyepieces I've chosen are: 24mm/68°, since I did not have any 1,25'' with this FL, and it provides maximum FOV. And 20mm/68°, because I only have Plössl and some unknown department EP at this FL. 16mm was not available when I made purchase, otherwise I would grab it too. These Maxvison cost 60-80 eur, equivalent Meade 5000 are around 220 eur in Europe, quite a difference.
They have plain looks without any fancy paintings, but I like it. They are sturdy and seem pretty well built. Instead of usual eye-caps you can twist the eyepiece and the eye-rest slides towards you. The 24mm is rather big and heavy for 1,25'' - around 400g, but still within reasonable limits not to cause any balance problems. The 20mm is smaller and comparable to other designs in size and weight, perhaps about 250g.
I've only limited experience with around 1 year of observing with fast achromats, so take my insights more like a pointers than rigid examinations. Also I do not have any top tier EP to compare (like Televue or Pentax) - I have mostly medium tier EPs around 150eur/piece and also some budget sets like Plössls and HR planetaries. Eye relief of Maxvision eypieces should be cca 20mm for the 24/68 and cca 15mm for the 20/68. I did not measure it, but it seems about right, maybe a bit smaller. I do not wear glasses while observing and both EP are comfortable to look through. With glasses it might get tricky, esp. with the 20mm.
Observing was done with Skywatcher ST120 (120mm F5 achromat).
First target was Sun with Baader solar foil. I used the the 20mm EP, the image was nice, sharp and crisp. When I added the Baader solar continuum contrast filter, it truly came to life. Granularity was obvious and easily visible, sun spots well defined and sharp - much better than 20mm Plössl. Image was crisp and sharp almost to the edge, but first defect is seen - near the edge (on all sides) the Sun is egg-shaped instead of round circle.
From sun I moved to landscape structures and buildings where I tested both - 24mm and 20mm, they performed with similar results. Again, image was crisp and sharp in almost full field, only very near edge (5%?) did it lose clarity. Again it looked crisper than Plössl, though closer now, probably because atmosphere was boiling over there. However, with straight lines (buildings) the optical aberration was clear - the lines were becoming curves toward the edge, from the images on Wiki it looks like Pincushion distortion. This was noticeable even not far from centre and became pronounced near the edges. However I'm not sure how much is from eyepiece and how much is from fast uncorrected scope. When I tried Plössl the pincushion was still there, it was much smaller, this could be because of much smaller AFOV (52°). The inner 52° of Maxvision field looked similar to Plössl with regard to field curvature and it became more pronounced outwards.
Later I compared with Axiom 23/82° which is similar focal length and wide field (but 2''). Pincushion was still there, but smaller than in Maxvision EP. So I would say part of it is from the scope and part from the Maxvision EP, which together creates noticeable distortion unfortunately.
I stopped aperture to 5.75cm which turns the scope to F10.4 with idea of being better corrected. I don't know whether this should affect field curvature but to my eyes it did not, it was still there in the same level.
Barlow: I have GSO ED long barlow 3x, which works very well in general. Later, when air was no longer so hot, I tried it with both Maxvision EPs. This gave 75x (24mm) and 90x(20mm). Images remained very sharp in both EPs. The pincushion distortion seemed smaller, maybe because of bigger focal length?
Note: On Meade's web page they say about 5000 SWA: "perfect optical match for Schmidt-Cassegrains, fast Newtonians and Schmidt-Newtonians.". No mention of refractors, so maybe that is why I'm getting such a big pincushion there...
Conclusion Day: Cheap and excellent EP for Sun observation in white light but not for terrestrial observation.
For night, I've chosen Celestron C9 Edge (235mm F10 SCT). This scope I only got very recently, so everything will look superb in it, my observations might be biased .
First I tested on buildings: pincushion still present but smaller, yet some shows in Axiom EP too, though very small.
Star fields (Cygni region): pinpoint stars in full field, pincushion was not observable even when I did look for it (moving star patterns towards edges). Perfect to my eyes, I did not notice any aberrations.
M57 Ring nebula: good well defined image, especially with UHC filter.
Lyra double double: 2nd split was only hinted, but it looks like seeing problem. With 11mm/82° Explore scientific the split was done but it was very wavy.
Albiero double: pretty image, colours showing well.
M13 Hercules globular cluster: Sharp well defined beautiful image with stars resolved except for the core. For core it needs more magnification, not eyepiece fault.
Moon: Razor sharp image in full FOV. Pincushion can be seen when one looks for it (terminator becomes slightly curved towards the edge), but it was not disturbing at all.
Conclusion Night: Great eyepieces with nothing to really complain about, except for slight field curvature, which is not easy to notice anyway.
Final verdict: Excellent performance for the price. The only downside I noticed is some field curvature (pincushion). Will they replace your Televue? Probably not, unless you need the money :-). But I think they are true cheap alternative to something like Panoptic. Definitely a keeper for me, and on most nights it will replace 23mm/82° Axiom to avoid balancing problems. For long focal length scopes I recommend them without reservations. For short FL scopes it is still very good value for night use or observing Sun, though you might notice some field curvature. I would not recommend them for daytime terrestrial viewing, especially with short focal length refractors.
Disclaimer: Before purchasing the eyepieces I did not even know "Maxvision" company exists .