This variable density neutral density filter for astronomical observations is effective for observing the moon, Venus, and bright stars. This filter adjusts the brightness of the celestial object you're observing without changing its color. By rotating the ring under the filter, you can continuously adjust the light transmittance from 1 to 40%. This filter reduces glare when observing the details of the moon's surface or when observing Venus and bright stars.
It reduces glare when observing the details of the moon's surface, Venus, or bright stars.
[Compatible with 31.7mm eyepieces]
Attach to the tip of a 31.7mm eyepiece for use.
There is a φ28.5mm male screw on the eyepiece attachment side and a female screw of the same standard on the opposite side, so other filters (such as color filters) can be stacked on top of it.
Brand: Vixen
[Product Features & Recommended Points]
●Variable Density & Fine-Tunable ND Filter
By rotating the lower ring of the filter, the light transmission can be adjusted continuously from 1% to 40%. This allows you to reduce glare while clearly observing bright objects such as the Moon, Venus, or bright stars.
●Design That Preserves Color Accuracy
The filter does not affect color tones, maintaining a natural appearance. This makes it easier to notice subtle color differences on celestial bodies and faint contrast patterns.
●Compatible with 31.7mm Eyepieces & Stackable Filter Threads
Designed for 31.7mm eyepiece diameter. The opposite side of the mount has a φ28.5mm, P=0.6mm female thread, allowing other filters (color, IR, etc.) to be stacked, offering versatile usage.
●Compact & Lightweight Design
Diameter: φ31.4mm, thickness: 22.4mm, weight: only 16g. Highly portable and lightweight, it won’t add unnecessary burden as a telescope accessory.
●Includes Accessories
Comes with a protective case. Convenient for storage and transport, it protects the filter surface from scratches and dust.
[Recommended For]
- Those who want to see finer details of the Moon’s craters and maria.
- Those bothered by glare when observing Venus or bright planets.
- Those who want to avoid bright stars overwhelming the view when observing nebulae or star clusters.
- Those who want to reduce the hassle of switching multiple filters or make their observation setup lighter for transport.
[Summary]
This 31.7mm Variable ND Filter (Model 36165 / CELESTRON 94107) provides a highly practical solution to the “excessive brightness” problem in astronomy. Its fine-tunable transmission allows effective reduction of glare from lunar craters, bright planets shortly after sunset, or overly bright stars in the field of view, greatly enhancing observation comfort. Additionally, it maintains color accuracy, is lightweight, compact, and comes with a protective case, making it a highly practical design. Suitable for a wide range of telescope users, especially beginners to intermediate observers, it fulfills the desire to see the stars and Moon “more clearly” and “more comfortably.”
