Centered on the 470nm wavelength, the Baader Blue Bandpass Eyepiece Filter (2") for Astronomical Usecan be used by itself or stacked with other filters to enhance your observations when viewing or imaging comets or planets such as Venus, 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 2" eyepieces and other accessories such as diagonals and Barlows.

Planetary Viewing/Imaging Filter    470nm Wavelength Bandpass    2" 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

• For visual and photographic planetary use
• Observe high clouds on Mars, enhances contrast of hazes on terminator of Mars
• Appears to make reddish structures darker—ideal for observing the Great Red Spot on Jupiter
• Shows Saturn rings better
• Monitor the structures in the atmosphere of Venus
• Highlights the fine details in gas tails produced by comets
• 70% average transmission bandpass throughput

Related Questions and Answers

Q: 1. Can I use the T-mount adapter shown in "Recimmended Accessories" to shoot through this eyepiece with my D-SLR? I already have one, and a Nikon F-mount adapter. Can I just screw it to the threads on the viewing end of the eyepiece, then attach my D-SLR via my Nikon adapter, or do I need to get a special connector?

A: You need this adapter to attach a T mount adapter, Alpine Astronomical Baader Hyperion M43/T-2 T-Adapter BH #ALHTA43T2 • MFR #HTA43/T2 https://bhpho.to/30q8Ltq

Q: 2. 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: 3. 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: 4. how to adapt this to a camera lens with a 62mm thread (yes, this will result in some vignetting which I will have to tolerate)?

A: Currently B&H does not stock an adapter allowing the Alpine Astronomical H-Alpha 20nm Bandpass Filter (2") to a camera lens with a 62mm thread.

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

A: Yes this Eyepiece would work with that Scope.

Q: 7. 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: 8. Do these filters come with a case?

A: Each filter comes in a plastic case

Q: 9. 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: 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.