DayStar Quark Sodium D line filter
 DayStar Quark Sodium D line filterDayStar Quark Sodium D line filter 

DayStar Quark Sodium D line filter

£1,229.00✓ 2 year warranty


1x in stock shipped 1-2 working days

About this product

Model:  ds_quark_ep_sd
Part Number:  DSZSD

The Sodium Quark brings quick, easy fun of the Original Quark to Sodium D-Line.

For use on refractors of F/4 - F/8 focal ratio refractors.

This All-In-One design marries high quality components of adapters, snouts and Daystar Sodium filter into one simple assembly. Through design efficiency and optimisation, now users can enjoy the known high quality optics of Daystar at an affordable price.

Important: To prevent damage, we recommend using an Energy Rejection Filter on telescopes of 80mm aperture or more, or when tracking the Sun for long periods. This can be a UV/IR cut filter mounted before the diagonal. For apertures over approximately 120mm requires consideration of multiple factors, please contact us for advice.


  • For use on F4 - F/8 focal ratio refractors, the user needn't worry about configurations. Just insert in your diagonal, add an eyepiece and view.
  • Exact filter bandpass will vary based on final telescope application. No specific FWHM bandpass is designated, but it will be around 0.5Å or lower. The fully optimised design eliminates the need for any adapters. It's all combined in one lightweight eyepiece sized device.
  • The new, compact design configuration eliminates unnecessary components, weight and associated costs. We even reduced power consumption, so the Quark can now operate all day off a small, palm-sized optional battery pack.
  • Compatible with yellow glass ERFs offered by Daystar.  Red glass ERF filters will not pass Sodium. Daystar also recommends use with a UV/IR cut filter for safety. Users need to purchase an Energy Rejection Filter specific to their telescope for safe operation.
  • Baffles have been added to increase contrast and AR coatings are optimised for the 589nm wavelength. We even reduced power consumption, so the Quark can now operate all day off an optional small, palm-sized battery pack.

*The QUARK* assembly is a product of DayStar Instruments, using DayStar Filters' Fabry Perot etalon technology.

Why Sodium D-line?

Sodium will give high resolution sunspot detail, plague, granulation, and possibly the super-granulation depending on resolution and seeing of the observer.

Sodium can also show flare footprints, also known as flare kernels.

That is that a flare will begin and emit light in Sodium at the 2 ends first, before erupting in white light.

The line is brighter than both Calcium and even Hydrogen Alpha. So it's going to be very easy for observers to see and the exposures will be very short.

We'll be doing D2 line on 5890

Sodium D line Quarks will all be 0.5 or narrower.


REFRACTORS: For brief observing sessions using refractors with less than 80mm of aperture when not using a tracking mount, no rejection is necessary. Be alert for any rise in temperature of your telescope, diagonal, or Quark.

For telescopes under approximately 120mm of aperture, a screw in UV/IR cut filter can be employed in front of the telescope diagonal. The UV/IR cut filter reflects UV and IR light back out the front of the telescope, reducing temperatures inside.

Do not use a UV/IR cut filter with a telescope with an integrated rear field flattener or Petzval lens. The UV/IR cut filter must be the first optical element to encounter concentrated light.

Note that Magnesium falls outside the passband of some UV/IR cut filter designs, so always verify that a prospective UV/IR filter passes 397nm before purchasing.

Observing with over 120mm of aperture requires consideration of multiple factors please contact us for advice.

Example Images

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