Optolong SII narrowband filter 3nm, 2"

2" filter size

Optolong 3nm narrow band filters, generally working with astronomical monochrome cooling CCD and modified DSLR imaging in each single-channel. Corresponding with RGB channel (HA, OIII, SII), photographers can process Hubble images by astronomical post processing software.

Extra narrowband SIICCD3nm filter (Sulful II for CCD) is designed for nebula observation allowing 3nm bandwidth of light centered on a wavelength of 672nm through, and reducing the transmission of certain wavelengths of light, specifically those produced by artificial light including mercury vapor, and both high and low-pressure sodium vapor lights and the unwanted natural light caused by neutral oxygen emission in our atmosphere (i.e. skyglow)

Features:

• Give you higher contrast and greater detailed viewing;
• Decrease background noise and improve the contrast of objects;
• Increase the faint nebula signal and make i tto be brightness;
• With narrow band fitlers kit, you are able to process a hubble image;
• Through the optimization of the sustrate and upgrading of coating technology.

2" and 36mm filter sizes available. More size options coming later.