Celestron Nova
The Celestron Nova was a high end series of wide angle binoculars available in the 1980's. I show the 7x35, 7x50 and 10x50 below. I am not sure if there were other Nova models. The 7x50 and 10x50 are nearly mechanically identical. All models have rubber eyecups and multicoatings, at least on the outer surfaces.
Nova 7x35
Mfr: J-B56 (No J-E mark)
Date: circa 1980's
AFOV: ~77 degrees
TFOV: 11 degrees, 578 feet at 1000 yards
Eye Relief: ~10mm
Prisms: high index
This Celestron Nova 7x35 is different from the Swift Holiday Mark II J-B56 7x35. It has plano eye lenses versus the concave eye lenses on the Swift. After careful comparison, the Nova appears to have slightly better edge correction and less distortion, though at the expense of slightly less eye relief. The field stop is clean and easy to see without glasses, despite the limited eye relief. The Nova has relatively neutral color rendition, probably helped by the good quality multicoatings. There is a small amount of prism leakage visible. I would rate the Nova among the better wide angle 7x35's.
Nova 7x50
Mfr: J-B56 (No J-E mark)
Date: circa 1980's
AFOV: ~70 degrees
TFOV: 10 degrees, 525 feet at 1000 yards
Eye Relief: ~10mm
Prisms: high index
The Nova 7x50 appears to have the same optical design as the Swift Commodore but with better multicoatings. There is a fair amount of distortion and astigmatism at the edge of field, and the eye relief is a bit short. However, for those who aren't fortunate enough to have a B&L 7x50 WF, this is a good wide angle binocular for tasks such as sweeping the Milky Way.
Nova 10x50
Mfr: J-B56 (No J-E mark)
Date: circa 1980's
AFOV: ~80 degrees
TFOV: 8 degrees, 420 feet at 1000 yards
Eye Relief: ~10mm
Prisms: high index
The Nova 10x50 is optically similar to the Linet Imperial Fieldmaster, but with good quality multicoatings. The optics are sharp at the center of field but poor at the edge with noticeable pincushion distortion. The eye relief is also a bit short. Otherwise, this is a well made binocular.