Sky-Watcher Light Pollution Filter - 2 Inch
Best current price£23.99from Wex Photo Video
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Product Information
Full details
The Sky-Watcher 2 Inch Light Pollution Filter is designed for amateur astronomers observing in areas with significant light pollution. Its primary benefit is enhancing contrast, particularly for nebulae, by blocking common light sources while allowing crucial emission lines through. A potential caveat is its primary design focus, which might be less impactful for deep-sky objects that don't emit in specific wavelengths. Key features include its optical glass construction, targeted light blocking, and compatibility with various telescope apertures.
All features
| Brand | Sky-Watcher |
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Extended Product Information
FAQs
What type of light pollution does this filter block best?
This filter is most effective at blocking light emitted by mercury-vapor and sodium-vapor lamps, which are common in streetlights and urban areas. It works by allowing specific astronomical emission lines to pass through while blocking these artificial sources.
Is this filter suitable for viewing galaxies?
While it can help darken the background sky, its primary benefit is for emission nebulae. It may offer some contrast improvement for galaxies, but its effectiveness is less pronounced compared to nebulae viewing.
Can I use this filter with a camera for astrophotography?
Yes, this filter can be used for astrophotography to reduce light pollution and improve the contrast of nebulae. However, results will vary depending on the camera, telescope, and specific conditions.
Does the filter come with any adapters?
The filter is designed for 2-inch eyepieces and accessories. It does not typically come with adapters for 1.25-inch focusers; you would need to purchase a 2-inch to 1.25-inch adapter separately if your telescope only accepts 1.25-inch accessories.
How does this filter compare to broadband light pollution filters?
This filter is designed to pass specific emission lines (H-alpha, H-beta) more efficiently than some broadband filters, making it particularly good for emission nebulae. Broadband filters might offer a more general reduction in skyglow across a wider spectrum.
What is the warranty period for this filter?
Warranty information is typically provided by the retailer or manufacturer at the time of purchase. Please refer to your purchase documentation for specific warranty details.
Troubleshooting
Filter does not screw into the focuser/diagonal.
Verify that you are using a 2-inch eyepiece or adapter. Ensure there are no obstructions on the filter threads or the accessory threads.
No noticeable improvement in viewing.
Ensure the filter is properly installed and that the light pollution in your viewing location is primarily from sources the filter is designed to block (e.g., sodium and mercury vapor lamps). Check if the object being viewed is an emission nebula, as the filter is most effective for these.
Blurry or distorted images.
Ensure the filter is clean. Check that it is screwed in straight and not cross-threaded. Verify that your telescope's focus is correctly adjusted for the filter.
Color cast in the view.
Some color shift is normal as the filter works by blocking specific wavelengths. Ensure the filter is clean, as dirt can exacerbate color issues.
Pros and Cons
Pros
- Dramatically improves viewing in light-polluted skies.
- Significantly enhances contrast, making nebulae stand out.
- Blocks common light pollution sources effectively.
- Maintains good transmission for important emission lines.
- Suitable for a wide range of telescope sizes.
- Comes with a protective carrying case.
Cons
- May have less impact on objects that do not emit light in specific hydrogen lines.
- Effectiveness is highly dependent on the type and intensity of local light pollution.
- Primarily designed for nebulae viewing; less beneficial for planetary or galaxy observation in all scenarios.
- Requires a 2-inch focuser or adapter for mounting.
Setup, Compatibility & Care
Setup:
- Ensure your telescope has a 2-inch focuser or an adapter that accepts 2-inch accessories.
- Carefully screw the filter onto the threaded end of your 2-inch eyepiece or diagonal.
- Insert the eyepiece/diagonal into the telescope focuser.
Compatibility:
- This filter is designed for 2-inch eyepieces and accessories.
- It is compatible with most telescopes that have a 2-inch focuser, including refractors, Newtonian reflectors, and Schmidt-Cassegrains.
- For telescopes with only 1.25-inch focusers, a 2-inch to 1.25-inch adapter is required (not included).
Care:
- Handle the filter by its edges to avoid smudging the optical surfaces.
- Use a soft lens brush or compressed air to remove dust.
- For fingerprints or stubborn smudges, use a specialized optical lens cleaning solution and a microfiber cloth, applying the solution to the cloth, not directly to the lens.
- Store the filter in its provided protective case when not in use.