ToupTek New narrowband 2inch filter Variant:SII filter 2inch 6.5nm Achromatic Refracting Telescope: Designed for

Achromatic Refracting Telescope: Designed for sharp

then control every aspect of the telescope

If you have a camera with low dark current and effective cooling

Nebula 5 EQ/AZ Mount

Ergonomic 45-Degree Viewing Angle: Ensures comfortable

ToupTek New narrowband 2inch filter Variant:SII filter 2inch 6.5nm Achromatic Refracting Telescope: Designed forToupTek New narrowband 2inch filter Narrowband filters make astronomical photography more interesting. Emission nebulae contain rich and complex narrowband emission lines, such as the deep red 656. 28nm H emission line, the red [SII] (671. 6nm and 673. 1nm) and the blue green [OIII] (500. 7nm and 495. 9nm). Compared with broadband, narrowband filters only focus on a few very narrow bands, retaining only a few nanometers to a dozen nanometers of