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Ships within 48 hours · Estimated delivery Aug 17 - Aug 22
For many astrophotographers
Give you higher contrast and greater detailed viewing
If you have a camera with low dark current and effective cooling
then control every aspect of the telescope
fixed frequency
ToupTek New narrowband 2inch filter Variant:SII filter 2inch 6.5nm For many astrophotographersToupTek 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
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