Daystar Filters' 0.4Å half-bandwidth tuned Quantum Sodium Na-D Solar Filter uses its precise micro processor-controlled electronic tuning system to isolate the extremely thin but bright emission line from the Sun's surface continuum to produce highly detailed views of granulations, supergranulations, and P-modes. The filter is installed at the rear of the optical tube assembly (OTA), rather than before the primary objective so it can be used on telescopes of virtually any aperture and easily move between a variety of scopes.

This version of the Quantum is designed for professional research-grade users which require tight tolerances and exceptional quality. To accomplish this, Daystar improves homogeneity and on-band transmittance values across the substrate surface, so these filters require additional quality control steps, as well as additional fabrication and testing times.

It comes calibrated for the Sodium Na-D line at 5895.9Å and is used un-heated for observing the lower two emissions lines, or heated to view the higher two lines. By employing the electronic tuning system, the wavelength can be offset to make Doppler studies possible by photographing in each line and deriving different images after subtracting an average solar velocity image. This process is referred to as a dopplergram velocity image, and reveals the surface motions associated with supergranulation.

Most telescope configurations and styles can be used with no aperture limit, although Daystar recommends using the filter at focal ratios between f/27 and f/35. An optional Powermate Barlow or stop-down mask can be used to get to that f-stop, and an energy rejection filter or UV/IR cut filter must be used to prevent damage to the optical system. The Quantum is outfitted with an RS-232 serial port that allows it to be connected to a computer and enables remote viewing of the wavelength display and control of the tuning. It runs on 12 VDC power and comes with a 6' power cord and a set of international outlet plugs for the US, EU, UK, and Australia. A Q3GFTF Front Flat T-Plate is also included so that users can attach T-rings or snouts, which are available separately, to match their applications; with additional plates also available to match user's needs.

5895.9Å Sodium D Solar Filter    Engineered for Professional Research Use    View Sunspot and Supergranulation Detail    Half-Bandwidth Tuning: 0.4Å    Electronic Doppler Tuning Control    1.0 Å Offset Capability    Wavelength Output Accurate to 0.1Å    RS-232 Serial Port for Computer Control    Includes Q3GFTF Front Flat T-Plate    Runs on 12 VDC Power

Related Questions and Answers

Q: 1. Looking at the video, there does not appear to be any filter in front on the front element on the telephoto lense. Wouldn't you have to have a solar filter in front to keep from damaging the internal components of the telephoto lens? Should you use a Mylar solar sheet like I normally use for telephoto sun pictures.

A: You are right,it is called ERF(energy reflecting filter). I have ordered one with my Ha filter Aug 3 but has not arrived. So haven't been able to used the Ha filter.

Q: 2. Are these left over from 2017? That's the date on the product photo.

A: The DayStar Filters 70mm White-Light Universal Lens Solar Filter (Single, 65-89mm OD), that B&H offers are not left overs at all.

Q: 3. What size should I get for a Nikon 18-200 lens? The current screw-on filter says 72mm.

A: The 65-80 MM works perfectly on my Nikon with a 72mm lens cap. Since the camera will be pointing UP, it can't just fall off. As to folding the tabs, it doesn't matter which one you start with, just fold down the little tab on the left side first (looking at the word side). The little tab will be at a 45 degree angle, Makes it easier to get the big tab located on the adjacent right side into the notch, then fold the little tab back up to hold the right tab in place.During an eclipse, you want the filter to slip off/on super easy!

Q: 4. What do I need to use this with my Canon 5D M4?

A: This is to fit Canon SLR and DLSR bodies. You do not need anything extra for a Canon EOS 5D Mark IV.

Q: 5. What is the difference between this product and a Neutral Density 5.4 Solar Eclipse Filter besides the price?

A: The difference is safety and your vision! The solar filter is ISO 12312-2 Compliant. The neutral density filter is NOT. Read the ISO Warning on the product. ISO 12312-2 Compliant Warning: Viewing the Sun without proper protection can cause permanent eye damage, blindness, and equipment damage. Always use an approved ISO 12312-2 certified solar filter when observing the Sun through optics or cameras. Never use photographic neutral density filters for direct solar viewing, viewing the sun through an optic, or when using cameras with an optical viewfinder. Ensure the solar filter is ISO 12312-2 Compliant. And buy from a reputable source like B&H. Many of the answers to this question are inaccurate and dangerous. I have flagged those answers to B&H so hopefully those answers have already been removed. When you are looking at the sun either directly or through optics, get your answers from experts in the field.

Q: 6. DayStar Filters Camera Quark H-alpha Solar Filter for Canon (Prominence): Does this provide product adequate filtration of the sun for the upcoming eclipse, or does it need to be used in consort with additional filters on camera/scope for viewing?

A: The DayStar Filters Camera Quark H-alpha Solar Filter for Canon (Prominence) goes between your lens and camera. You still need a ERF (energy reflecting filter) on the front of your lens. This will prevent damage to the lens. For help choosing a ERF (energy reflecting filter) for your lens email us at sportoptics@bandh.com.

Q: 7. What size should I get for a lens using a 77mm filter, Canon 100-400?

A: Get the 65-89mm OD (outside diameter). I have a 77mm lens and it fits perfectly.

Q: 8. What is the difference between a tuned for prominences and a chromosphere filter? Is there one of them that does both better? How do I choose?

A: No, two different condition. The chromosphere is the sun's surface. The prominence is viewing sun flairs around the perimeter of the sun. .

Q: 9. will this work with an ED80T CF Triplet telescope?

A: Just got mine last week and got great views on my old SV AT1010 80mm f6 achro. Just saw black at first then, per the instructions, turned the tuning dial 2 clicks clockwise. In a few minutes i was seeing great chromo and proms as well. I got the front mount uv/ir blocker as i will be using it on a larger scope as well. You won't get a full disc view though because the focal length is greater than 450

Q: 10. What color does the sun appear - blue, yellow, red?

A: The sun's not yellow, it's chicken. - B. DylanActually it looks yellow through the eclipse filter. I've made some packing foam shims to hold it to the lens. It can be difficult to find the sun with your camera. I need a wide open f stop, and 1 or 2 seconds shutter.