Premium 2" UHC Nebula Filter for more contrast against stray light

2" Premium UHC filter - increases the contrast of gas nebulas

Contrast filter for observation and photography of mists - fits into the filter thread of 2" eyepieces and 2" adapters. By purchasing directly from the manufacturer, we can offer you these high quality filters, at a very interesting price.

Countless lights in cities and towns enormously affect the possibilities of astronomical observation. Many celestial objects go under in this light pollution downright, you hardly recognize anything.

With the UHC filter these interfering light sources are almost completely blanked out and the contrast in the observation increases enormously. Hundreds of additional objects are brought into the range of the telescope.

The filter is suitable for the following devices

The UHC filter can be used on all telescopes with 2 "eyepieces, from 70mm telescope aperture, the contrast enhancement is visible.For most telescopes with 2" excerpts is also a reduction to 1.25" with 2" filter thread there. Under "recommended accessories" we also offer such a reduction. This allows you to adapt the 2 "filter also to 1.25" eyepieces.

The mode of action of the UHC filter

Fortunately, many celestial objects glow in other areas of the spectrum, such as our artificial scattered light.

This is where the UHC filter comes in: it lets these important wavelengths through in a targeted manner while the rest of the spectrum is almost completely blanked out. Thus, the scattered light is attenuated to a fraction of the normal brightness, while the light of the celestial object can pass almost unhindered.

In the area where the filter is permeable, planetary nebulae (O-III) radiate and also many gas nebulae. The artificial scattered light is almost completely shut off.

The UHC filter works especially with gas nebulae and planetary nebulae.

Gas mists are gigantic accumulations of hydrogen, millions of times heavier than our sun! Planetary nebulae, such as the Dumbbell Nebula, are the remnants of old stars that are at the end of their lives.

With the two pictures (above) we simulated the effect of the UHC filter using the example of the dumbbell M27. The left picture shows how the dumbbell fog acts in a medium-sized telescope when you watch it from a small town. The picture next to it shows the dumbbell fog under the same conditions when using the UHC filter. You can see a lot more structures here than without filters!

(Unfortunately, because you can not reproduce the visual impression with real photos, because cameras see the celestial objects quite differently than the human eye, we simulated this image by image processing, the impression being as close as possible to the actual effect of the filter.)

Scope of delivery of the UHC L2:

- 2" interference UHC filters
- Metal frame with filter thread on both sides