Centered on the 500nm wavelength, the Alpine Astronomical Baader Green Colored Bandpass Eyepiece Filter can be used by itself or stacked with other filters to enhance your observations when viewing the moon or planets such as Mars, Jupiter, and Saturn. The optical glass filter is planeoptically polished and treated with seven-layer Phantom Group anti-reflection multi-coatings to improve contrast and clarity while eliminating reflections, scattering, or image dimming. Holding the filter is an black anodized aluminum frame made to fit standard 1.25" eyepieces and other accessories such as diagonals and Barlows.

Planetary Viewing/Imaging Filter    500nm Wavelength Bandpass    1.25" Eyepiece Threads    7-Layer Anti-Reflection Multi-Coated    No Reflections, Scatter or Image Dimming    Planeoptically Polished Optical Glass    70% Throughput Transmission    Blackened Aluminum Frame    Stackable with Other Filters

• Provides the sharpest images with achromatic refractors
• Improves the visibility of CO2 hoarfrost and ground fog on Mars
• Increases contrast between red and blue regions on Jupiter and Saturn
• Provides the best contrast for lunar craters Tyco, Copernicus, and Kepler
• 70% average transmission bandpass throughput

Related Questions and Answers

Q: 1. Do these filters come with a case?

A: Each filter comes in a plastic case

Q: 2. 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: 3. what does focal length of 21mm eyepiece become when the snout is removed?

A: The Alpine Astronomical Baader Hyperion 68° 21mm Astronomical Eyepiece (1.25"/2") would become 32.2mm with the snout removed.

Q: 4. Is this eyepiece waterproof?

A: The Alpine Astronomical Baader Hyperion 8-24mm Mark IV Zoom Eyepiece (1.25"/2") BH #ALHYPZOOM • MFR #HYP-ZOOM is not waterproof.

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. What accessories would I need to mount my Nikon F-mount DSLR to this eyepiece to shoot through it?

A: A T-mount adapter; BH# VELANFT. And depending on sensor size, some combination of extension tubes from the Alpine Astro T2 System for full coverage; BH# ALT225A .

Q: 7. Is this eyepiece barrel 1.25/2" or only 1.25" ?

A: The Alpine Astronomical Baader Hyperion 68° 10mm Astronomical Eyepiece (1.25"/2"), will work both with 1.25" and 2" holders." (We can see in the Overview it is explained-This eyepiece with a unique modular design that allows it to fit into standard 1.25" holders and accessories with the ability to remove the primary snout and have it fit into larger 2" holders as well.)

Q: 8. 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.

Q: 9. 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.

Q: 10. This zoom eyepiece is 3 times the price of Celestron's zoom. Is it worth that difference in cost?

A: It has much higher optical quality due to the -Phantom Coating Group Multi-Coatings and 7-Element/4-Group Flat-Field Lens Design