Use the Baader 0.6 Neutral Density Filter 1.25" - 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 1.25" 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 0.6, with 25% transmission and a reduction factor of 4—making it ideal for viewing and photographing the moon at its half-moon phase.

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 1.25" Eyepieces and Accessories    0.6 Optical Density    25% Transmission    4 Reduction Factor    Stackable with Colored and ND Filters

Related Questions and Answers

Q: 1. Does this work for visual astronomy also, or is it more designed for astrophotography?

A: Yes, this can be used as a conventional Barlow for viewing.

Q: 2. 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: 3. What items are in the box?

A: The Alpine Astronomical Baader 2x Carl Zeiss Abbe Barlow Lens (1.25") BH #ALZBARLOW • MFR #ZBARLOW comes with the Alpine Astronomical Baader 1.25"/T-2 Click-Lock Eyepiece Holder Adapter BH #ALT208 • MFR #T2-08 and a 2 year aarranty.

Q: 4. 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: 5. What is the outer housing diameter of this piece?? I need it to fit inside the 1.25" Orion Variable Universal Camera Adapter. So this eyepiece needs to have an outside diameter of less than 38.3mm.

A: The outer housing diameter of this eyepiece is listed at 101.5 mm so it would not fit.

Q: 6. Can I use the Baader 76 degree Morpheus 4.5 mm eyepiece in the Celestron Regal M2 100ED spotting scope I have ordered from B&H?

A: It probably wont work properly because its too magnified. The Spotting scope is too short a focal length, I would recommend a 12 mm & higher.

Q: 7. is this a filter that makes planets less bright?

A: Yes, Neutral Density filters make things darker however. It is mainly for use with the moon. The Alpine Astronomical Baader 0.6 Neutral Density Filter to reduce the amount of light coming into your eye during lunar observation and improve the view and contrast.

Q: 8. Would this lens Will this EP work effectively in a f/10 C5 scope?

A: Yes this Eyepiece would work with that Scope.

Q: 9. Is it parfocal with other Alpine Hyperion eye pieces?

A: This is the only additional information B&H has on the Alpine Astronomical Baader 72° Hyperion 36mm Aspheric Eyepiece (1.25"/2") https://alpineastro.com/products/baader-36mm-hyperion-aspheric-2-eyepiece And yes to the compatibility with other eyepieces

Q: 10. I have a Fuji X-Pro3 and T-Adaptor (for Fuji). Do I need this B&H #ALHTA43T2 in order to connect to the Mark 4 zoom?

A: That is correct, the B&H #ALHTA43T2 adapter is necessary to attach to T Mounts.