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Kasai Trading Co. 1.25" AstroPlan Eyepiece - 10mm

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Brand Kasai Trading Co.
Part Number K-AP10
Availability available

Product Info

Manufacturer Description

The Kasai Astroplan eyepieces are excellent all-round eyepieces, especially for the discerning lunar or planetary observer. They combine the crisp definition of orthoscopic eyepieces with good field correction over a larger 50-deg apparent field of view. While these are good performers even at shorter focal ratios, they really come into their own with sharp, crisp, contrasty views in long focal ratio scopes.

Superior lens polishing with multi-coating on all internal air-glass surfaces (so these are FMC), a modern 5 element design, edge blackened optics, engraved lettering, end caps, and standard filter threaded barrels attest to the excellent craftsmanship of these Japanese eyepieces. The body of the eyepiece is made from strong, lightweight aluminum and features a knurled rubber ring, while the 1.25" barrel is made from chrome-plated brass.

These optical characteristics coupled with their small size make these Kasai AstroPlan eyepieces perfect for visual observation (especially in binoviewers) as well for afocal projection photography.


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Apparent Field of View 50°
Barrel Size 1.25" (31.7mm)
Bolt Case Included Discontinued Item
Bolt Case Size Agena 42x60mm
Coatings Fully Multi-Coated
Height (without Eye Guard) 42.8mm
Max Width 35.2mm
End Caps 2
Eye Lens Diameter 9.5mm
Eye Relief by Design 8.5mm
Filter Threads Standard 1.25" Filter Thread (M28.5 x 0.6)
Focal Length 10mm
Lens Elements 5
Lens Groups 3
Rubber Eye Guard No
Blackened Lens Edges Yes
Manufacturer Kasai Trading Co.
Eyepiece Focal Length 5.1mm - 10mm
Eyepiece Field of View Up to 50 degrees
Eyepiece Series Kasai AstroPlan
Barrel Type Smooth sided
Eyepiece Weight 2.70oz (76.54g)