Technical data sheet
Optolong L-PARA 2" – Dual Band Hα+OIII 10 nm Filter
The Optolong L-PARA 2" is a dual-band filter: it allows only the two emission lines of nebulae to pass through, Hα (656.3 nm) and OIII (500.7 nm), with a 10 nm band each. It cuts out light pollution and a good portion of moonlight: with a color camera, it allows for imaging emission nebulae, supernova remnants, and planetary nebulae even from city skies. Transmission remains above 85% even with fast optics, from f/2 to f/4.
- Dual band: Hα 656.3 nm and OIII 500.7 nm, 10 nm each
- Transmission over 85% on both lines, even with fast f/2 to f/4 optics
- Blocks out-of-band light from 300 to 1000 nm (average optical density over OD4)
- For emission nebulae, supernova remnants, and planetary nebulae, even with the Moon and from city skies
- For color cameras: CMOS, CCD, DSLR, and mirrorless
- 2" format with M48×0.75 threading
- Not suitable for galaxies, clusters, and reflection nebulae: these require a broadband filter, such as the Optolong L-Pro
Technical specifications
| Parameter | Value |
|---|---|
| Model | Optolong L-PARA 2" |
| Type | Dual band filter (Hα + OIII) |
| Transmitted lines | Hα 656.3 nm · OIII 500.7 nm |
| Bandwidth (FWHM) | 10 nm ± 0.5 nm per line |
| Transmission | Over 85% on the lines, f/2 to f/4 |
| Out-of-band blocking | 300 – 1000 nm, average optical density over OD4 |
| Threading | 2" M48×0.75 |
| Glass thickness | 1.85 mm |
| Compatibility | Color CMOS, CCD, DSLR, and mirrorless cameras |
| Applications | Emission nebulae, supernova remnants, planetary nebulae |
Products costing over €199.99 include free shipping.
Note: Official Optolong warranty with support and technical assistance in Italy.
Optolong L-PARA 2" – Dual Band Hα+OIII 10 nm Filter
The Optolong L-PARA 2" is a dual-band filter: it allows only the two emission lines of nebulae to pass through, Hα (656.3 nm) and OIII (500.7 nm), with a 10 nm band each. It cuts out light pollution and a good portion of moonlight: with a color camera, it allows for imaging emission nebulae, supernova remnants, and planetary nebulae even from city skies. Transmission remains above 85% even with fast optics, from f/2 to f/4.
- Dual band: Hα 656.3 nm and OIII 500.7 nm, 10 nm each
- Transmission over 85% on both lines, even with fast f/2 to f/4 optics
- Blocks out-of-band light from 300 to 1000 nm (average optical density over OD4)
- For emission nebulae, supernova remnants, and planetary nebulae, even with the Moon and from city skies
- For color cameras: CMOS, CCD, DSLR, and mirrorless
- 2" format with M48×0.75 threading
- Not suitable for galaxies, clusters, and reflection nebulae: these require a broadband filter, such as the Optolong L-Pro
Technical specifications
| Parameter | Value |
|---|---|
| Model | Optolong L-PARA 2" |
| Type | Dual band filter (Hα + OIII) |
| Transmitted lines | Hα 656.3 nm · OIII 500.7 nm |
| Bandwidth (FWHM) | 10 nm ± 0.5 nm per line |
| Transmission | Over 85% on the lines, f/2 to f/4 |
| Out-of-band blocking | 300 – 1000 nm, average optical density over OD4 |
| Threading | 2" M48×0.75 |
| Glass thickness | 1.85 mm |
| Compatibility | Color CMOS, CCD, DSLR, and mirrorless cameras |
| Applications | Emission nebulae, supernova remnants, planetary nebulae |
Products costing over €199.99 include free shipping.
Note: Official Optolong warranty with support and technical assistance in Italy.
SKU:85360
Optolong L-eNhance 2" – 10 nm Dual Band Hα+OIII Filter for Astrophotography
- Regular price
- €269,99
- Sale price
- €269,99
- Regular price
-
€299,99
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Optolong L-PARA 2" – Dual Band Hα+OIII 10 nm Filter
The Optolong L-PARA 2" is a dual-band filter: it allows only the two emission lines of nebulae to pass through, Hα (656.3 nm) and OIII (500.7 nm), with a 10 nm band each. It cuts out light pollution and a good portion of moonlight: with a color camera, it allows for imaging emission nebulae, supernova remnants, and planetary nebulae even from city skies. Transmission remains above 85% even with fast optics, from f/2 to f/4.
- Dual band: Hα 656.3 nm and OIII 500.7 nm, 10 nm each
- Transmission over 85% on both lines, even with fast f/2 to f/4 optics
- Blocks out-of-band light from 300 to 1000 nm (average optical density over OD4)
- For emission nebulae, supernova remnants, and planetary nebulae, even with the Moon and from city skies
- For color cameras: CMOS, CCD, DSLR, and mirrorless
- 2" format with M48×0.75 threading
- Not suitable for galaxies, clusters, and reflection nebulae: these require a broadband filter, such as the Optolong L-Pro
Technical specifications
| Parameter | Value |
|---|---|
| Model | Optolong L-PARA 2" |
| Type | Dual band filter (Hα + OIII) |
| Transmitted lines | Hα 656.3 nm · OIII 500.7 nm |
| Bandwidth (FWHM) | 10 nm ± 0.5 nm per line |
| Transmission | Over 85% on the lines, f/2 to f/4 |
| Out-of-band blocking | 300 – 1000 nm, average optical density over OD4 |
| Threading | 2" M48×0.75 |
| Glass thickness | 1.85 mm |
| Compatibility | Color CMOS, CCD, DSLR, and mirrorless cameras |
| Applications | Emission nebulae, supernova remnants, planetary nebulae |
Products costing over €199.99 include free shipping.
Note: Official Optolong warranty with support and technical assistance in Italy.
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Paga in 3 rate da €89,99 senza interessi.