Use the Baader 0.9 Neutral Density Filter 2" for Alpine Astronomicalto reduce the amount of light coming into your eye during lunar observation and improve the view and contrast. The lens surfaces are fully multi-coated with Phantom Group seven-layer optical coatings. This maximizes light transmission across the entire visual spectrum, stepping down the light throughput while maintaining color-neutral views without reflections, ghosting, or stray interference light.

Its housing is made to fit most 2" eyepieces and has female threads for stacking it with other ND and colored filters to further improve views when observing planets and other objects. This iteration of the ND filter line has an optical density of 0.9, with 12.5% transmission and a reduction factor of 8—making it ideal for viewing and photographing the moon during the time shortly after half-moon.

The filter can also improve solar viewing, but only as a secondary pre-filter stacked with a primary dedicated solar filter. Failure to use a dedicated solar filter may result in permanent eye damage up to and including blindness.

Ideal for Lunar Observation    Phantom Group Optical Coatings    Fits 2" Eyepieces and Accessories    0.9 Optical Density    12.5% Transmission    8 Reduction Factor    Stackable with Colored and ND Filters

Related Questions and Answers

Q: 1. Does this work with other RF mount cameras or just the EOS R?

A: The Alpine Astronomical Baader Wide T-Ring Set for Canon EOS R fits all Canon RF mount cameras.

Q: 2. How do I connect this filter to my Olympus Zuiko f/4 300mm PRO lens?

A: I have no idea how you would attach a 2" Alpine Astronomical Baader Neodymium Moon & Skyglow Filter (2") BH #ALFMS2 • MFR #FMS-2 1 review Alpine Astronomical to a lens having a 77mm opening

Q: 3. how can I adapt the Baader U-Filter 2" to a Nikkor AF-S 50mm 1:1.8G Lens?

A: 2" is the outside diameter of the filter, not the thread. It's an M48 thread as stated on the manufacturer website, baader-planetarium. Use a normal step-up ring.

Q: 4. It says you can remove the smaller nosepiece to use the 2" barrel. But it changes the focal length. To what?

A: This is the only information being offered by Alpine Astronomical https://alpineastro.com/products/baader-13mm-hyperion-68-modular-eyepiece#description

Q: 5. Is this 48mm?

A: No it is 2 inches which equals 50.8 mm B+W 48mm UV/IR Cut MRC 486M Filter BH #BW486MC48 • MFR #66-1069163 https://www.bhphotovideo.com/c/product/718417-REG/B_W_66_098546_66_098546_48mm_UV_IR_Cut.html

Q: 6. Dose it has a Ultra-Short version like EOS adapter?

A: Celestron T-Ring for Nikon F-Mount Cameras BH #CETRN • MFR #93402

Q: 7. How can we adapt the 2" UV bandpass filter to a Sony E-mount 49mm lens?

A: I know of no adapter to mount a 2" (50.8mm) filter on to a 49mm opening. I do know some that use gaffing tape.

Q: 8. Will this fit a M48 X .75 thread?

A: This is an M42 Thread, so it will not fit that threading size.

Q: 9. Is this filters that make planets less bright?

A: The Alpine Astronomical Baader 3.0 Neutral Density Filter is used to reduce the amount of light coming into your eye during lunar observation and improve the view and contrast. It is not made for planetary use.

Q: 10. Is this a #8 Yellow?

A: No it is not. A Yellow #8 is typically used for an increase in contrast with black and white films. The Alpine Astronomical Baader Yellow Colored Bandpass Eyepiece Filter is centered on the 495nm wavelength suppresses the secondary blue spectrum when using achromatic and half-apochromatic refractor telescopes, increasing image sharpness.