Thousand Oaks Optical Broadband Light Pollution Reduction Filter - 1.25" # LP-125
Contiguous US Customers:
All items we sell ship for free within the Contiguous US. Shipping will be via the cheapest shipping method which will vary depending on the items in your order. During checkout, you may also be shown other optional faster shipping choices.
US Customers in Hawaii and Alaska:
Free shipping applies to almost all products. A few large telescopes and mounts are excluded from this free shipping offer. For these items, please contact us to obtain a shipping quote before you check out using the online shopping cart.
International Customers:
Free shipping does not apply to international orders. During check-out, you will be presented with several shipping choices and costs. However, the export of some items may be restricted outside the US due to size or manufacturer restrictions.
Quick Overview
- Blocks most man-made light pollution (sky glow) from common sources such as mercury vapor and sodium vapor lighting
- Improves the visibility and contrast of emission nebulae and other similar deep sky objects
- Can improve visibility and contrast of some reflection nebulae and larger, diffuse galaxies
Product Details
Broadband "Light-pollution Reduction" (LPR) filters are designed to improve the visibility of deep sky objects by blocking out the mercury vapor, sodium vapor, and other such emission lines from man-made or natural sources which contribute to light pollution. In turn, these filters allow a broad range of more useful wavelengths to pass to the eye or imaging sensor. By selectively screening out of some of the background sky glow, the contrast is increased and allows deep sky objects to stand out against the background.
Broad-band filters don’t eliminate the effects of light pollution or make the objects brighter, but they can improve the visibility of many deep-sky objects. Emission nebulae are the most improved, but these filters can also give a slight contrast boost to reflection nebulae and a few of the larger and more diffuse galaxies. Large versions of these broadband filters that can fit over DSLR lenses can improve imaging of wide fields when sky glow is present.
Broadband filters can offer a noticeable boost in contrast and visibility of the fainter outer detail for objects like the Orion nebula (M42), the Lagoon nebula (M8), the Trifid nebula (M20), and others. The improvement isn’t as noticeable on star clusters or small galaxies.
Since some light is blocked by the filters, objects may look fainter from a dark sky site when using a broad-band filter than without one. Severe levels of light pollution can be too much for the broad-band filters to handle effectively, so observing from a dark site is preferred in these cases.
Other Information
- Country of Manufacture: United States
