I've finally got around to digging up info on these Panorama EPs from Skywatcher. I too have seen them for some time, and they are not particularly popular. Not too surprising though from what I've come to find.
These are actually the exact same eyepieces as the Celestron Luminos (many people confuse the Luminos line as the same as the Axiom LX line, but they are totally different designs). ONLY difference is the outside casing. As a result, both the Luminos line and the Panorama ARE NOT FOR NEWTONIANS. These are designed for scopes with a convex shaped focal plane, such as refractors, SCTs and Maks. Newt's produce a concave focal plane. Also, these eyepieces also are better suited to slower f/ratio refractors, not fast f/ratios as they will display field curvature and other off-axis aberrations.
The aberrations that people consistently describe when using these eyepieces is a lot of astigmatism with their Newts. Astigmatism is a tell-tale sign of an optical mismatch between scope and eyepiece. Astigmatism is an aberration that is controlled with appropriate design, and one reason why EPs that are great in Newts are expensive - it is more difficult and more expensive to design and manufacture EPs for Newtonians. If you are spending significant $$$ on eyepieces for a Newt, you would want to make sure that at least astigmatism is not what you are paying for.
Note also that seeing something like a little astigmatism is not fatal with Newts. It could actually be quite an acceptable eyepiece if it does show a little astigmatism as this aberration will be limited to the outer edge of the FOV, which is not an area where any serious observing is done. I mentioned earlier the Axiom LX line from Celestron. The 23mm Axiom LX is actually quite a nice eyepiece in an f/5 Newt, showing just the smallest amount of astigmatism at the very edge. Not perfect, but if you find one (these are not expensive second hand) it is actually a good option in a Newt if you don't want to spend the big bucks!
Also, due to the complex nature of contemporary EPs, what aberrations can be seen in a given line (such as the Panoramas here) can and do vary tremendously between individual focal lengths. Where one focal length can show a lot of astigmatism in a Newt, as an example, another focal length from that same line could actually be textbook perfect! It does happen. For this reason, don't dismiss outright an entire line of eyepieces based only on one individual focal length from that series! You could find an absolute gem in that line! I have with other lines
Back to the individual Panorama eyepieces. The 23mm and 15mm are not good performers in
Newts for the money. If you are paying significant $$, you will want an eyepiece that is better suited to Newts. These are not they. The 7mm, this has been a tough one to find any reliable info on. I've looked at reviews of both the Panorama and the Luminos, and the common failing with these reviews is no one is mentioning the scope they are using it. I've found only one scope reference for this eyepiece, and it was in a slow SCT, where it was very favourable just like its two other stable mates. However, nothing about it in Newts. So with so little good information available, it is not possible to say yay or ney for the 7mm in Newts.
For the money you are looking at spending, you would be better off with the Vixen LVW line. These are now available only second hand, so the $$$ won't be as high as when new. And in Newts, these are fabulous for the price. I know, I still have mine. These have only a 65° AFOV, a little smaller than your Hyperions, but the LVW line tears strips off the Hyperions in Newtonians - chalk and cheese! Hyperions are best with refractors, SCTs and Newts. Again, I know from personal experience with the Hyperions - really nice EPs, just not in Newts. Except for the 5mm, which is actually stonking good in Newts (read paragraph No. 4 above for why).
In the 82° range of EPs, alas you need to start shelling out the big buck if you want astigmatism totally out of the picture. The Explore Scientific 82° line is Newt specific in design and so is also very blooming good.
Alex.
