Quick answer
Choose the MASUYAMA 85° for an immersive, high-apparent-field view in 1.25″ focusers, or the Panoptic 68° 41mm for the widest true field possible in a 2″ focuser.
Field of view and telescope compatibility
The MASUYAMA 85° eyepiece delivers a very wide apparent field in a compact 1.25″ barrel, making it ideal for observers who want a dramatic spacewalk feel without upgrading to a 2″ focuser. However, its 10mm focal length means the true field is moderate, best for medium-high power views of nebulae and star clusters.
The Panoptic 68° 41mm uses a 2″ barrel to achieve the largest possible true field in that format—its 46mm field stop is the maximum for 2″ eyepieces. This makes it a superb choice for sweeping star fields and large deep-sky objects, but it requires a telescope with a 2″ focuser and may be heavy on smaller mounts.
Eye relief and viewing comfort
The MASUYAMA 85° has an eye relief of only 6.5mm, which is short. Eyeglass wearers will struggle to see the full field without removing their glasses. The Panoptic 68° features an adjustable screw-type top that allows comfortable eye positioning, and its longer eye relief is more forgiving for observers who wear glasses.
Trade-offs at a glance
- Apparent field width: MASUYAMA 85° feels wider and more immersive per view; Panoptic 68° gives a generous but less dramatic apparent field.
- True field size: Panoptic 41mm with its 46mm field stop shows the largest possible true field in a 2″ eyepiece. MASUYAMA 10mm shows a much smaller true field. For sweeping large objects, Panoptic wins. For magnified wide views, MASUYAMA is better.
- Eyeglass compatibility: MASUYAMA's 6.5mm eye relief is too short for glasses. Panoptic's adjustable eyecup and longer relief work well with glasses.
- Focuser requirement: MASUYAMA fits any 1.25″ focuser. Panoptic needs a 2″ focuser and adds weight.
Eyepiece details
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MASUYAMA 1.25″ Series 85° Eyepieces: 5-element Masuyama Ortho Plossl design, fully multi-coated, 85° apparent field, 6.5mm eye relief. Gives an immersive wide-field view in a standard 1.25″ barrel but requires close eye placement.
MASUYAMA 1.25″ Series 85° Eyepieces
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Panoptic 68° Eyepiece | 41mm: 41mm focal length, 68° apparent field, 46mm field stop (largest possible in 2″), adjustable eyecup. Delivers the widest true field available in a 2″ eyepiece with comfortable, adjustable eye relief.
Panoptic 68° Eyepiece | 41mm
Which one fits you?
Best for
- Observers with a 1.25″ focuser who want an immersive 85° apparent field at medium power
- Viewers who don't wear eyeglasses and prioritize a dramatic spacewalk feel
Not for
- Eyeglass wearers needing long eye relief
- Observers seeking the widest true field possible (choose a 2″ eyepiece like the Panoptic instead)