The 1.25" ZWO Duo-Band Filter passes light in the hydrogen-alpha (656.3nm) and O-III (500.7nm) wavelengths. It improves contrast and seeing for deep space objects such as emission nebulae, and can be used to filter out moonlight or urban light pollution. With a one-shot color astronomy camera, it allows use of narrowband techniques that normally require a monochrome camera, filter wheel, and narrowband filters. The Schott-substrate glass is 1.85mm thick, optical-coated on both sides, and mounted in machined metal with engraved lettering.

Passes Ha (656nm) & O III (500nm) Light    Reduces Moonlight & Light Pollution    Better Contrast for 1-Shot Color Cameras    Double-Sided Optical Coating    Laser-Engraved Typing

Related Questions and Answers

Q: 1. What's the storage capacity of the device? Can it save 4 hours solar eclipse time lapse pics?

A: The ZWO Seestar S50 50mm f/5 All-in-One Smart Telescope has 64GB of internal memory. Since the photos are only 2mp, it will easily store photos taken during an eclipse.

Q: 2. Could you clarify, please, is internet access mandatory for operation of the telescope?

A: The ZWO Seestar S50 50mm f/5 All-in-One Smart Telescope requires the use of the app designed for this item, so Internet access would be required.

Q: 3. Will this work for a Sirui 24mm/F2.8 anamorphic w 1.33x squeeze on a Fuji X mount, or will it vignette? Thanks!

A: The Sirui 1.25x Anamorphic Adapter comes with a 72mm adapter ring that will connect with Sirui 24mm f/2.8 Anamorphic 1.33x Lens (X Mount). It should work and not vignette. However, we have not tested this adapter lens combination.

Q: 4. Does this have any dust or moisture protection? Will it be ok in mild dewey weather or dusty desert atmosphers?

A: The ZWO Seestar S50 50mm f/5 All-in-One Smart Telescope is not moisture resistant but it has a built in dew heater to remove dew build up which often occurs at night. It is not sealed against dust.

Q: 5. Does the scope come with a case?

A: The ZWO FF107 APO Astronomical Telescope (OTA Only), BH # ZWOFF107APO, includes a hard aluminum case.

Q: 6. This product needs a 3.7-4.2 volt charger, NOT 5V like my iPhone has. Where do I get a charger for it?

A: The ZWO Seestar S50 50mm f/5 All-in-One Smart Telescope comes with a USB-C Charge Cable to be plugged into a Power supply to charge like this one: Belkin Boost Charge USB Type-C Power Bank (20,000mAh https://www.bhphotovideo.com/c/product/1600479-REG/belkin_bpb002btbk_boost_charge_20k_power.html

Q: 7. What is the smallest filter size recommended? Is a 62mm filter size lens on MFT too small for good results?

A: With the Sirui 1.25x Anamorphic Adapter, a filter smaller than the front filter thread size of 82mm is not recommended.

Q: 8. Does the Seestar track comets?

A: The ZWO Seestar S50 50mm f/5 All-in-One Smart Telescope (BH # ZWSSS50 ) can spot a comet, but it cannot track it.

Q: 9. Are the references to time in the App all based on Chinese time?

A: The time is based on your smartphone and location when using the ZWO Seestar S50.

Q: 10. Hi there! What's the front filter-thread diameter of the Sirui 1.25x anamorphic adapter?

A: The front filter thread size is 82mm on the Sirui ADP125X.