Optolong HSO 7nm Narrow Band Deep Sky Imaging Filter SET 2" for CCD/CMOS Astro Photography

Optolong HSO 7nm Narrow Band Deep Sky Imaging Filter SET 2" for CCD/CMOS Astro Photography (7nm H-alpha + 6.5nm SII + 6.5nm OIII)

Please note, although these filters are also available individually, if you buy this full HSO bundle you will save some money in comparison to the price of the individual items.

Please see the separate product descriptions for each individual filter.

WARNING:

Optolong filters are not designed for solar observation. DO NOT LOOK AT THE SUN WITH ANY OPTOLONG FILTER as permanent eye damage will be the result.

Filter Cell (only for filters in a cell)

• Ultra-thin filter cell minimise vignetting by maximising possible clear aperture (clear aperture is 26mm for 1.25” size and 45mm for 2” size)
• Aerometal Material
• Precise CNC Machining
• Sand Blasting Process
• Black Anodized Finish
• Extinction Treatment to Prevent Reflection
• Laser Engraving No Fading

Available Sizes

• Standard 1.25" and 2”
• Round 36mm Unmounted

Packaging

• Plastic PP Case
• Imported High Pressure EVA Case Lining
• Silver Cardboard Box
• High Density Sponge Carton Lining

The Major Emission Lines of Nebulae: H-α 656.3nm, H-β486.1nm, OIII 495.9nm, OIII 500.7nm 
The Major Emission Lines of Artificial Light Pollution: Hg 435.8nm, 546.1nm, 577nm, 578.1nm, Na 598nm, 589.6nm, 615.4nm, 616.1nm