Astronomik SII (Sodium II) 6nm MaxFR Clip-in Filter (Full Frame Mirrorless)

Astronomik MaxFR SII 6nm Clip-in Filter

• The MFR coating allows this 6 nm ionized sulfur filter to be used on all instruments down to f/2

• The MaxFR filter line by Astronomik is designed for fast optical systems (RASA, Epsilon, and other astrographs)

• This Astronomik MaxFR SII 6 nm Filter has been designed specifically for astrophotography purposes

• Does not require any housing modifications in order to enable use

• Installation can be done without tools while removal is accomplished with the aid of an included small hook

• Allows ionized sulfur (SII) light to pass through while completely cutting off the remainder of the visual spectrum plus IR

• Best out-of-band blocking possible from ultraviolet (UV) through infrared (IR)

• FWHM bandwidth of approximately 6 nm

• An optimal fit for imaging planetary nebulae and supernova remnants

• Experience very high contrast with no haloing

• Made in Germany, a country that is known for producing optics of great distinction

About the Astronomik MaxFR SII 6nm Clip-Filter

Using this filter guarantees 90% transmission or more at SII (671.7nm-673.0nm). This filter is made to Astronomik's exacting standards. While transmission ratings may vary between each filter, you are guaranteed a transmission rating greater than 90%, with a typical transmission rating of around 94% for the 6 nm SII. The specific T-Max will be listed on the filter case. You can rest easy knowing that every unit is thoroughly tested and guaranteed to meet Astronomik's stellar benchmark of performance!

MaxFR CCD filters from Astronomik highlight the contrast between objects. The SII filter highlights the contrast between ionized sulfur (SII) emission line objects and the skyglow background. Plus, this filter also completely obstructs artificial light sources such as mercury (Hg), sodium (Na), and skyglow, making it an excellent filter for use in heavily light polluted conditions. A superior quality substrate allows the Astronomik MaxFR SII 6 nm CCD Filter to provide the same needle sharp star views you would see with your normal telescope.

All superfluous wavelengths in the visible and IR bands of the spectrum are completely obstructed with this Astronomik 6 nm SII CCD Filter. Parfocal with all other Astronomik filters and diffraction limited to keep the optical performance of your telescope from degrading. All Astronomik filters are delivered in a durable, high-quality plastic filter case.

Compatible Camera Bodies

• Canon EOS R
• Canon EOS R5 Mk I and II
• Canon EOS R6 Mk I, II and III
• Canon EOS R7
• Canon EOS R8
• Canon EOS RP
• Canon EOS Ra
• Nikon Z5 and Z5 Mk II
• Nikon Z6 Mk I, II and III
• Nikon Z7 Mk I and II
• Nikon Z8
• Nikon Z9
• Sony A7 Mk I, II, III, and IV
• Sony A7R Mk I, II, III, IV and V
• Sony A7S Mk I, II, and III

In most cases Clip-in Filters for cameras not listed above can be special ordered. Please email for availability and pricing.

**Please note this filter must NEVER be used for solar observing or imaging. Doing so will cause permanent damage to your camera and eyes.

***No returns are accepted if the original Astronomik package seal is broken or damaged.

***Coupon codes will not be accepted with the purchase of any Astronomik brand Clip-In Filters***

****Clip-in filters are not compatible wth the Canon RF 14mm f:1.4 RF lens unless the gel filter bracket is removed from the rear fo the lens.

Please email with any questions: info@spencerscamera.com