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Bresser EXPLORE SCIENTIFIC OPTOLONG 1.25 L-Pro Deep-Sky Light Pollution Filter
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| Type of Product | Telescope acsessories |
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L-Pro Deep-Sky Light Pollution Filter
Purpose and Application
The L-Pro filter is designed for deep sky nebula constellation photography, addressing the challenges posed by urban light pollution. It enables amateur astrophotographers to capture high-quality astronomical images even in light-polluted city environments, without the need for expensive monochrome cameras or multiple narrowband filters.
Filter Characteristics
L-Pro is a multi-bandpass filter that maximizes the transmission band to offer better color balance. It allows astrophotography of broadband emission objects such as galaxies, reflection nebulae, and globular star clusters with minimal color cast. This makes it an excellent choice for light pollution suppression.
Technical Description
The filter selectively reduces transmission of wavelengths from artificial light sources including mercury vapor lamps, high and low pressure sodium vapor lights, and natural skyglow caused by neutral oxygen emission. It maintains high transparency at key nebula emission lines: OIII (496nm and 500nm), H-beta (486nm), NII (654nm and 658nm), H-alpha (656nm), and SII (672nm). This enhances contrast and detail for both visual observation and astrophotography in sub-rural areas with heavy light pollution.
Performance and Usage
- Suitable for both visual observation and astrophotography.
- Effectively suppresses light pollution while maintaining low transmission reduction for continuous spectrum space objects.
- Enhances contrast between nebulae and the night sky rather than increasing object brightness.
- Suppresses infrared wavelengths, allowing use for 'L' image captures with CCD cameras.
Safety Warning
WARNING: This filter is not designed for solar observation. Do not look at the sun with this filter as it can cause blindness.
Coating Technology
The L-Pro filter features multiple anti-reflective coatings applied via ion deposition technology. This ensures durability, scratch resistance, and stability of the central wavelength (CWL) unaffected by temperature changes. The coatings provide maximum transmission in the passband and high optical density in the off-band range, guaranteeing precision and homogeneity.
Features
- Professional visual and photographic filter for astronomy
- Improves deep sky nebula constellation photography
- Best choice for broadband light pollution suppression
- Filter diameter: 31.7 mm (1.25 inch)
- Connecting thread: M28.5 x 0.6 mm (Eyepiece thread 1.25 inch)
- Selected optical glass material
- Spectrum range: 380–750 nm
- Surface quality: 60/40 (per MIL-O-13830 standard)
- Fine-optically polished glass ensuring accurate 1/4 wavefront and highest parallelism on both surfaces
- High transmission at major nebula emission lines (H-alpha 656 nm, OIII 496 nm & 500 nm, SII 672 nm, H-beta 486 nm)
- Precision off-band blocking targeting major artificial light pollution emission lines (Na 589 nm, Hg 435 nm and 578 nm)
Scope of Delivery
- L-Pro filter (1 piece)
- Dust protection box (1 piece)
