Product Details
- Brand: Optolong
- Material: Light Pollution Filter" or "Astrophotography Filter
- Photo Filter Thread Size: 48.04 Millimeters
- Coating Description: Multi Coating
- Photo Filter Effect Type: Enhancing
- Water Resistance Level: Not Water Resistant
- Product Dimensions: 2"L x 2"W
- Photo Filter Size: 48 Millimeters
- Product Dimensions: 2 x 2 x 0.04 inches
- Item Weight: 1.55 ounces
- Item model number: 139
- Date First Available: June 26, 2020
- Manufacturer: Optolong
- Country of Origin: China
- Dual H-Alpha/O-III 7nm narrowband filter
- Allows for imaging in bright man-made light pollution and moonlit conditions
- Most useful for One-Shot Color cameras
- Take color images without needing to combine images with multiple filters
- Use for taking images of emission nebulae
The Optolong L-eXtreme is a 7nm dual-bandpass filter which can be used with
one-shot color cameras like DSLRs and CCD/CMOS astrophotography cameras. It is
also more suited for fast systems. The convenience and cost effectiveness of
this filter allows amateurs to image emission nebulae even in bright, light-
polluted or moonlit skies. The L-eXtreme isolates the H-Alpha and Oxygen III
nebula emission lines so that the contrast and signal-to-noise ratio of the
nebulae are maximized. For people who are imaging in very light polluted areas
or when the moon is out, the L-eXtreme is an excellent choice. The advantage
of the L-eXtreme filter is that there is no light transmission between the
H-beta and OIII lines (as there are no nebula emission lines there). This
reduction in light pollution maximizes the nebula's signal and makes the sky
background darker while imaging. Unlike the L-eNhance filter, which is a tri-
band (transmits Hb, Ha, and OIII), the L-eXtreme filter is dual-band, passing
just the Ha and OIII emission lines in order to deliver improved light
pollution rejection. Note: For imaging galaxies and reflection nebulae, the
Optolong L-Pro filter is more appropriate as this filter will reject much of
the light from those objects.
