Pentax Eyepiece SMC XW 16.5mm 2"

Extremely Broad Field of View

Introducing the latest additions to the XW series, these two new eyepieces boast an expansive field of view reaching an impressive 85°, the largest within the series. Coupled with a generous eye relief of 20 mm, they offer a remarkably wide perspective, perfect for captivating observations of nebulae and star clusters.

Optical Excellence for Unparalleled Image Quality

Crafted with precision, these new eyepieces employ an optical system comprising 7 elements arranged in 5 groups, surpassing the standards set by the traditional XW series. This design ensures crisp star images right up to the periphery of the field of view. The advanced optics incorporate lanthanum glass elements with high refractive power and minimal dispersion, resulting in a well-balanced image with negligible aberrations. Specially engineered to mitigate the bothersome blackout effect, they effectively counteract pupil spherical aberration.

PENTAX's Signature Multi-Coating for Optimal Light Transmission

Each lens surface exposed to air benefits from PENTAX's original multi-coating, while laminated surfaces receive the innovative partial coating treatment. This combination achieves exceptional light transmission, surpassing 90% (an impressive 96% at 550nm) across the visible light spectrum.

Enhanced Image Contrast through Advanced Light-Shielding Technology

Utilizing cutting-edge computer simulation, the XW series incorporates a strategically positioned light-shielding diaphragm to minimize internal reflections significantly. The result is a noticeably brighter, higher-contrast image, enhancing your viewing experience.

Weatherproof Construction for Durability

Built to withstand various conditions, the XW Series boasts a JIS Class 4* weatherproof construction, ensuring reliability even in drizzly or dewy nighttime environments.

Specifications:

Focal Length: 16.5 mm

Apparent Field of View: 85°

Eye Relief: 20 mm

Number of Lenses: 7

Number of Groups: 5

Optical System Coating: SMC multi-coating

Light Transmission: 96%

Field Stop: 12 mm

Special Features: Adjustable Eyepiece Cup (Rotatable), Optional Camera Adapter

Filter Thread: Yes

Inert Gas Charge: No

Type: Eyepiece

Build Type: UWA

Series: XW

Weight: 745 g

Length: 142 mm

Diameter: 76 mm