Pentax
Pentax XW16.5 2-Inch Telescope Eyepiece - Wide Angle
★★★★★
## Explore the Cosmos with Unparalleled Clarity Introducing the PENTAX smc XW16.5 2-Inch Eyepiece, crafted in Japan for discerning astronomy enthusiasts. This eyepiece offers an expansive 85° apparent field of view, perfect for observing nebulae and star clusters with exceptional detail and clari...
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Overview
## Explore the Cosmos with Unparalleled Clarity
Introducing the PENTAX smc XW16.5 2-Inch Eyepiece, crafted in Japan for discerning astronomy enthusiasts. This eyepiece offers an expansive 85° apparent field of view, perfect for observing nebulae and star clusters with exceptional detail and clarity. Its advanced optical design and weather-resistant construction ensure a premium viewing experience.
Specifications
- Apparent Field of View: Extra-Wide 85°
- Eye Relief: 20mm
- Optical System: 7 elements in 5 groups
- Coating: Multi-Layer Coating
- Construction: All-Weather (JIS Class 4 - Note: Not for underwater use)
- Country of Origin: Made in Japan
Key Features
【Field of view of 85°】The widest viewing angle in the XW series, suitable for observing nebulae and star clusters
【New optical system 】7 elements in 5 groups that surpasses the conventional XW series to obtain sharp star images all the way to the edge of the field of view
【Original multi-layer coating】Delivers outstanding light transmission efficiency
【Advanced light-shielding technology】 Useful for improved image contrast
【Weather-resistant* construction】The XW series features a weather-resistant structure of JIS class 4*, for reliable all-weather viewing. *It cannot be used underwater.
Specifications
Field of View
85°
Optical System
7 elements in 5 groups
Coating
Original multi-layer coating
Image Contrast
Improved via Advanced light-shielding technology
Weather Resistance
JIS Class 4
Eyepiece Type
Wide Angle
Focal Length
16.5mm
Barrel Size
2-Inch
Pros & Cons
👍 Pros
- Provides an exceptionally wide 85° field of view, ideal for expansive observations of nebulae and star clusters.
- Features a new optical system with 7 elements in 5 groups, ensuring sharp star images across the entire field of view.
- Incorporates original multi-layer coating for outstanding light transmission efficiency, enhancing image brightness.
- Utilizes advanced light-shielding technology for improved image contrast, reducing stray light interference.
- Boasts weather-resistant construction (JIS Class 4), allowing for reliable all-weather viewing without concern for moisture.
👎 Cons
- The 85° field of view, while wide, may require more careful focusing at the edges for some users.
- Weather resistance is rated as JIS class 4, meaning it is splash-proof but not designed for underwater use.
- Specifics on the type of glass used in the new optical system are not detailed, beyond general improvement.
- Does not specify the material composition of the eyepiece body, only its weather-resistant quality.
- The term "new optical system" is general and may not convey specific technical improvements to all users.
Frequently Asked Questions
What is the field of view offered by the Pentax XW16.5 telescope eyepiece?
This eyepiece provides an exceptionally wide 85° field of view, making it suitable for observing large celestial objects like nebulae and star clusters.
How does the new optical system enhance viewing performance?
The new optical system, comprising 7 elements in 5 groups, is designed to deliver sharp star images consistently, even at the very edge of the field of view.
Is this eyepiece designed for use in various weather conditions?
Yes, it features weather-resistant construction rated at JIS Class 4, ensuring reliable performance in conditions like dew or light rain, though it is not for underwater use.
What coating technology is used to improve light transmission?
The Pentax XW16.5 eyepiece utilizes an original multi-layer coating to achieve outstanding light transmission efficiency, contributing to brighter images.
How does the eyepiece improve image contrast?
It incorporates advanced light-shielding technology, which is useful for reducing internal reflections and thereby improving overall image contrast.
What is the focal length of this Pentax XW eyepiece?
The focal length of this particular eyepiece is 16.5mm, providing a specific magnification suited for detailed observation.
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