Astronomik 1.25"/2" Narrowband Emission Line SII-CCD Filters w/ 12nm FWHM & MFR Coating (ASK-SII-12NM-CCD)

Astronomik 1.25"/2" Narrowband Emission Line SII-CCD Filters w/ 12nm FWHM & MFR Coating (ASK-SII-12NM-CCD)Due to the combination of the narrow bandwidth of 12nm and the high transmission of typically 96% the filter gives you an contrast boost, as all unwanted light from other wavelengths than 672nm is blocked form UV up to the IR. This results in an very dark background compared with any filters with a higher bandwidth The FWHM of 12nm is optimized for typical DSLR cameras with CMOS sensors and CCD cameras with a normal high dark current: With these

The ease of operation

Just place your target inside the circles and it’s ready to view in the eyepiece

77 arc seconds Light Gathering Power (Compared to human eye): 459x Apparent Field of View: 1

Sky-Watcher's Evolux apochromatic doublet refractors are the perfect blend of superior extra-low dispersion glass and affordability

7 oz (133 g) Environmental Protection: No Nitrogen Filled: No Tripod Adaptable: No Carrying Case: Woven Nylon Dimensions: 88

Pulse Width Modulated (Suitable for Dew Heaters or Flatbox)

The thickness is 5mm

from Alaska to Ecuador to Tierra del Fuego

TeleVue Micro Pinion Assembly for Newer

Using this bracket allows you to bypass the FeatherTouch focuser completely

Reduces or eliminates vignetting

we know the best telescope is the one you will actually use