SVBONY UHC 1.25 Filter for Astronomy escope Monocular Eyepiece Observations of Deep Space Object

Basically, it works by darkening the background so you can see more nebulosity that would otherwise be too faint
This filter has allowed one to actually see some small planetary nebulae that would otherwise be too washed out by the background to be seen, and Im able to see more detail and more of the dimmer fringe of larger nebulae like the Orion Nebula, the Dumbbell Nebula, and the Lagoon Nebula.
It helps with finding the little planetary nebulae because it dims everything but the nebula, , and with the filter in place the stars are dimmed somewhat but the nebula isnt. The nebula is the dot that doesnt get dimmer when you thread in the filter. It works well at both low and high powers, too.

Features:

" UHC filter

: 1.25 simply attach to eyepiece-cased in a sturdy transparent case
, great for city and suburban observation

Multi-coated Glass with an lon-assisted ion Technology /Standard 1.25 inch/M28.5*0.6

Improve the image contrast of observed objects

Customer feedback on UHC filters:

This broadband (50nm) UHC works well and has allowed me to view nebula (other than M42 / Orion Nebula) for the very first time from my light polluted backyard. I never thought I would be able to detect nebula from my backyard, where I do most of my visual observing using 8" and 10" F5 dobs. Im in a red/white light pollution zone which is considered "Bortle 8" aka "cant see ****, captain". This filter hits well above its weight and is comparable to a more expensive Optolong UHC filter.

Even with most of my city using LED street lights, whose light pollution is harder to filter out, this filter performed exceptionally and allowed me to detect nebulosity in Scorpius last night. The nebulosity was faint, but it was absoluy there. I didnt need to use averted vision or any other aids to detect it. With visual observing, you cant expect bright Hubble views albeit I suspect this filter would work exceptionally well for astrophotographers, who will be able to achieve great results with this filter + long exposures. The fact that I could visually detect any nebula at all that wasnt M42 in Orion makes this worth the measly $20 paid.

Members of a popular astronomy forum have sent the SVbony UHC filters out to Lumicon- one of the top optics and filter labs- and it revealed that this filter is virtually identical in performance to Optolong UHC filter and may even be the same thing. The Optolong is well regarded and sells for $80; a $20 SVbony performing the same as a filter that is 4X as expensive is a great deal.

The price and the performance of this makes it a must have filter if you dont have one. Im not a fan of filters as I find the price:performance underwhelming for visual observing, but this filter hits all the right notes. I will likely buy SVbony of this filter, I like its performance enough that I want it available for my wide field EPs. I wish SVbony made an OIII; Id buy it in a heartbeat if it performed as well as this UHC.

SVBONY CLS 1.25" Deep Sky Filter for Astronomy Monocular escope Eyepiece Cut Light Pollution Visual & Astronomical

The SVBONY City Light Suppression broadband filter is designed to improve the visibility of various Deepsky objects. By selectively reducing the transmission of wavelengths of light pollutants, specifically those produced by artificial lightings including mercury vapor lamps, both high & low pressure sodium vapor lights and the unwanted natural light caused by neutral oxygen emission in our atmosphere (). Together with the highly transparent in main nebula emission lines at OIII(496nm and 500nm), H-beta (486nm), NII(654nm and 658nm), H-alpha(656nm) as well as SII(672nm), the filter is suitable for enhancing the contrast and details for both visual and photographic purpose at sub-rural area.

Features:

(central wavelength) no deviation affected by temperature change


,process Black Anodized Finish Extinction Treatment to Prevent Reflection Laser Engraving No Fading
8.90% transmission of main nebula emission lines (, OIII 496nm&500nm, SII672nm and H-beta 486nm).
9.0.1% transmission of off-band, specifically the major emission lines of artificial light pollution (, Hg 435nmand 578nm).


s brightness. In many cases, they increase the contrast between nebula and night sky, not brightening the nebula.

Multi-coated Glass with an lon-assisted ion Technology/Standard 1.25 inch/M28.5*0.6

The effect of using CLS filter

How to use it?

How this filter works

The CLS has a wider pass-band than a narrower UHC filter, so it gives a more natural colour response than a UHC filter. CLS is therefore best for mild to moderate light pollution filter for suburban skies.

Artificial lighting such as mercury vapour lamps, both high & low pressure sodium vapour lights and unwanted natural light caused by neutral oxygen emission in our atmosphere (skyglow) are almost compley suppressed by the SVBONY CLS filter.

The filter selectively allows light from deepsky objects through, with high transmission of ionised oxygen O-III (496nm & 500nm), Hydrogen Beta / N-beta (486nm), N-II(654nm and 658nm), H-alpha(656nm) and S-II(672nm).

By selectively blocking light pollution and transmitting these desirable wavelengths, the contrast and detail of deepsky objects is greatly enhanced.

Package Details:

Package 1:1*1.25 UHC filter
Package 2:1*1.25 UHC filter+1*1.25 CLS filter
Package 3:1*1.25 CLS filter