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.
Jul 5, 2015
Easy to Use,Accurate,Strong Construction,Lightweight,Quality Lenses,CompactCons: Comments:
Everybody was looking for the Masuyama 5 element plossls. Well these are it. Compared this 5mm to a Ultima 5mm (they look exactly alike on the outside). They couldn't be more different. The Kasai is so much better optically, it is worth every penny. Wish they had more focal lengths, you know like 4, 6, 7, 8, etc. I would buy them all.
This review was provided courtesy of AgenaAstro.comSort by
|Apparent Field of View||50°|
|Barrel Size||1.25" (31.7mm)|
|Bolt Case Included||Yes - Free Agena Eyepiece Container|
|Bolt Case Size||Agena 42x60mm|
|Height (without Eye Guard)||34.6mm|
|Eye Lens Diameter||4.6mm|
|Eye Relief by Design||4.3mm|
|Filter Threads||Standard 1.25" Filter Thread (M28.5 x 0.6)|
|Rubber Eye Guard||No|
|Blackened Lens Edges||Yes|
|Manufacturer||Kasai Trading Co.|
|Eyepiece Focal Length||5mm and Under|
|Eyepiece Field of View||Up to 50 degrees|
|Eyepiece Series||Kasai AstroPlan|
|Barrel Type||Smooth sided|
|Eyepiece Weight||2.20oz (62.37g)|