Daystar QUARK Cromosphere Filter Assembly

Product code: DSZ4C
£832.50 (ex. VAT)
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Product information

Daystar Quark Altair SPECIAL OFFERS:
Special offers:
1) £20 off Daystar Quark when ordered with ANY Altair Astro Camera.
2) £30 off Daystar Quark when ordered with ANY Altair Astro Telescope Optical Tube.
(Above offers can be combined for total £50 savings. If you order online we'll refund you the appropriate amount.)
Daystar Quark H-Alpha Eyepiece (Cromosphere Version)
This new, All-In-One design marries high quality components of a telecentric barlow, adapters, snouts and Daystar hydrogen alpha filter into one simple assembly. Through design efficiency and optimization, now users can enjoy the known high quality optics of DayStar* at an affordable price.
A suitable ERF (Energy Rejection Filter) should be used before the filter. This is screwed into the front of the diagonal to stop any UV or IR radiation before it gets to the Quark. Strictly speaking under 80mm of aperture an ERF isn't required, but we still recommend it.*
Recommended refractors & ERF combinations:  *
Lightwave 60ED F7 Triplet (better with 2" ERF on diagonal)
Lightwave 66ED F6 Doublet (better with 2" ERF on diagonal)
Starwave 70mm ED Triplet (better with 2" ERF on diagonal)
Lightwave 72ED F6 Doublet (better with 2" ERF on diagonal)
Lightwave 80ED F6.25 Doublet (better with 2" ERF on diagonal)
Starwave 80ED F7 Doublet (better with 2" ERF on diagonal)
Altair Wave Series 80mm ED Triplet APO (good with 2" ERF on diagonal, even better with front ERF)
Starwave 102ED F7 Doublet (requires 2" ERF on diagonal, better with front ERF)
Altair Wave Series 102mm ED Triplet APO (requires 2" ERF on diagonal, better with front ERF)
Starwave 115mm ED Triplet APO (requires front mounted ERF to take best advantage of the optics)
Altair Wave Series 115mm ED Triplet APO (requires front mounted ERF to take best advantage of the optics, 2" ERF on diagonal is not considered safe)
Altair Wave Series 130mm ED Triplet APO (requires front mounted ERF for safety and best optical quality)
Starwave 152mm Achromat (requires front mounted ERF for safety and best optical quality)
The QUARK contains a custom Daystar Instruments 4.2X telecentric Barlow lens fully optimized in coatings and optical design specifically for the Hydrogen Alpha wavelength. This highly specialized telecentric lens offers superior field flatness.
Exact filter bandpass will vary based on final telescope application, so QUARK assemblies are qualified to show either prominence or surface (chromosphere).  No specific FWHM bandpass is designated.
Now observers can buy a filter based on their desired observing goals instead of their budget.  Choose prominences and surface (Chromosphere) detail. 
The fully optimized 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. Baffles have been added to increase contrast and AR coatings are optimized for the 656nm wavelength.
1.25" or 2.0" combo eyepiece snouts with safety indent slot directly into your diagonal
Standard 1.25 eyepiece drawtube output with optional 2" and SCT accessories available.
Brass compression ring to protect eyepiece.
Uses USB power, 5v 1.5amp
Includes 90-240VAC wall adapter with international plug adapters.
Tuning knob allows wing shifting +/- 0.5Å with detents at every 0.1Å
LED indicator for power, warming, ready, fault
5 year manufacturer warranty.
Optional 8-hour battery pack available. (contact us)
Solar powered power supply. (contact us)
Integrated, fully baffled 2 element telecentric 4.2X barlow optimized for 656nm
Integrated 12mm blocking filter
21mm clear filter aperture
Best performance with F/4 - F/8 refractors
Full disk viewing possible on refractors up to ~450mm focal length refractors
No aperture limitations. May be used on larger refractors for higher magnification views (with ERF*)
Ships in convenient Twist-Case for safe, dust-free storage.
Not suited for off-axis application.
* Important Q&A: 
Q: Do I need a 2" ERF  (Energy Rejection Filter) on the diagonal mirror for telescopes under 80m?
A: Although not strictly required for apertures under 80mm, for telescopes up to around 100mm we recommend using an enegrgy rejection solution such as a UV IR filter in front of the diagonal mirror. For any solar tracking system such as EQ Mount or iOptron Minitower AZ, an ERF solution is required because the sun stays in the field of view for a long time. You can order a 1.25" or 2" UV/IR filter in the dropdown menu depending on your diagonal type. 
Q: What kind of ERF do I need for telescopes above 115mm?
A: For any telescope above 115mm you really should get a front-mounted ERF. A 115mm refractor will perform better with a front-mounted ERF than with a 2" ERF filter and it is safer. 
Q: Why use a front mounted ERF? 

A: There are 2 main reasons for using a front mounted ERF:

#1 Safety and longevity of your equipment. Internally DIY mounted ERF filters work by reflecting the unwanted radiation (in this case mainly heat) and they can reflect an intense focused beam of energy back up the telescope tube. If slightly off-axis, this can set fire to the inside of your telescope tube - usually when it strikes the edge of the baffles. (Baffles are circular rings inside most telescope tubes which block stray light to improve contrast). Also it can direct that energy out of the tube on-axis. You can light a cigarette in front of the objective lens, with an internally mounted ERF set too close to the objective.

#2 Image quality. All ERF filters do absorb some energy, as no filter can be perfect, and the radiation of this heat occurs by convection and also dissipates into the surrounding metal via the filter holder. This excess heat can cause heat currents inside the tube which reduces image quality. 

Q: I have read about hobbyists using a smaller "internally mounted" ERF of smaller aperture, part-way up the telescope tube to save money. Does this work, and what are the trade-offs? 

A: An internal ERF works fine for smaller apertures up to about 4", but for larger apertures, the image quality isn't as ever as good as with a front mounted ERF. This is because a front mounted ERF keeps the whole telescope cool, so there are less heat currents generated inside the tube to degrade the image. Heat currents are more of a problem as aperture increases. Refractors over 4" seem to be more affected by tube currents and by the time you get to 6" the image is noticeably degraded. Another reason to have a front ERF is a safety one. We have had customers with a burnt tube, melted UVIR cut filters, and also melted Narrowband Ha pre-filters. A large, (say 80-100mm) internally mounted ERF has to have relatively thick glass to remain flat during the coating process because the coating process causes tension on the glass. Any piece of glass behind the objective (front) lens of the telescope is in fact considered a "lens", and must be treated as part of the telescope's lens system with resulting impact on the final image. The closer it is to the lens, the worse the degradation will be. It's worth bearing in mind that refractors are not designed with an extra "mystery" lens at an arbitrary distance from the front lens inside them. They are precisely figured to work as one unit, and the further towards the objective the "extra lens" is placed, the more alterations you are introducing into to the optical system. Any flat lens placed inside a refractor light cone behind the pupil (front objective) will cause increased spherical aberration which reduces the ability of the telescope to resolve fine detail. The bottom line is that for scopes under 100mm you can use a good quality 2" ERF filter in front of the diagonal, but for best results with scopes larger than 100mm, a front ERF is recommended.

Technical specifications

Brand Daystar
Product Code DSZ4C