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Bresser EXPLORE SCIENTIFIC OPTOLONG 2 L-Pro Deep-Sky Light Pollution Filter
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| Type of Product | Telescope acsessories |
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L-Pro Filter for Deep Sky Nebula Photography
The Bresser EXPLORE SCIENTIFIC OPTOLONG 2 L-Pro filter is designed to enhance deep sky nebula constellation photography by effectively suppressing light pollution. It is ideal for amateur astrophotographers facing challenges from urban light pollution, enabling high-quality astronomical imaging even in city environments.
Light Pollution Suppression and Color Balance
This multi-bandpass filter selectively reduces wavelengths from artificial light sources such as mercury vapor lamps, high and low pressure sodium vapor lights, and natural skyglow caused by neutral oxygen emission. It maintains high transmission at key nebula emission lines including OIII (496nm and 500nm), H-beta (486nm), NII (654nm and 658nm), H-alpha (656nm), and SII (672nm). The balanced transmission band minimizes color cast, allowing clear astrophotos of broadband emission objects like galaxies, reflection nebulae, and globular star clusters.
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 and detail in sub-rural areas with heavy light pollution.
- Suppresses infrared wavelengths, making it suitable for 'L' image captures with CCD cameras.
- Increases contrast between nebulae and the night sky without artificially brightening objects.
Important Safety Warning
WARNING: This filter is not designed for solar observation. Do not look at the sun with this filter as it can cause permanent blindness.
Coating Technology
The L-Pro filter features multiple anti-reflective coatings applied via precision ion deposition technology. This ensures durability, scratch resistance, and stable central wavelength unaffected by temperature changes. The coatings provide maximum transmission in the passband and strong optical density in the off-band range, guaranteeing high image contrast and quality.
Technical Specifications
- Filter diameter: 50.8 mm (2.0 inch)
- Connecting thread: M48 x 0.75 mm
- Optical glass material selected for quality
- Spectrum range: 380–750 nm
- Surface quality: 60/40 (per MIL-O-13830 standard)
- Fine optical polishing 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 & 578 nm)
- Multi-layer anti-reflection coatings for highest image contrast
Included in the Package
- 1 x L-Pro filter
- 1 x Dust protection box
