DayStar Filters repair and restoration services

DayStar Filters currently warranties its products for a period of 10 years. Previous DayStar Filters owner, Del Woods offered a 5 year warranty on filters manufactured before January 1, 2006. If you are a DayStar Filter owner with a filter manufactured less than 10 years ago and you experience a problem with the fitler's fuction or performance, please contact us

at to for service questions.

Darkening or degradation of the image: 
Filters older than 10 years do frequently require service. The most common service requirement is the replacement of 2 optical components which age and darken over time. Those are the 'blocker and trimmer' elements. As these two elements age, they darken and lose contrast concentrically from the outside to the inside. A user will notice the view slowly developing poor contrast towards the outside of the aperture. On a visual inspection of the filter, the red side of the filter will show a dark or mottled, donught shaped ring forming from the outside in. The gold side often evidences as speckles or dots in the same ring pattern from the outside in.

Please DO NOT open your filter yourself and attempt to perform any repairs on your own. There are no user-servicable parts inside; and simply twisting the optical elements in your filter stack can cause irreperable damage to the system.

Repair service for these two elements is $875.00
Replaced blocker & trimmers are warranted for another 10 years.

This is normal age-related element failure which occurs slowly sometime after 10 years. Climate conditions in which the filter is kept will either accelerate or decelerate the speed in which this darkening occurs. A warm and moist environment will speed this deterioration process. Users should try to store the filter in a dry, room temperture environment. Some users in tropical zones use desicant packets in their storage to protect the filter. There is no precise forcast to how long a filter will function. We have found filters kept in constant operation to still be functioning perfectly after 25 years, while others fail in 12.

Heater malfunction:
110 - 240vac heaters which have been plugged into 12vdc without the proper sine-wave converter will be permanently damaged and will no longer heat.

Upgrade for heater assemblies to a new, functional Quantum assembly is $875.00 plus shipping
Replaced heaters are warrented for another 10 years.

Clean and Check:
DayStar offers a standard clean-and-check service for filters which may have fallen into disrepair, become dirty or whose settings have been incorrectly set.

Clean and Check service is $250.00 plus shipping
Turnaround for this service is currently 3 weeks.

Etalon Upgrades:
DayStar offers an etalon upgrade service, whereas we remove the etalon crystal of your DayStar Filter and replace it with a narrower bandpass or PE / University quality etalon. Those prices are available upon quotation and are subject to availability of desired etalon crystal. For information and pricing on etalon upgrades, please contact Pete Reynolds at

User-Damaged / Missing Etalon Restoration:
Unfortuately, users may chose to void their warranty, opening the DayStar out of curiosity.  While we advise to NEVER OPEN A DAYSTAR FILTER for risk of damage to the etalon crystal, we occasionally must restore filters damaged by curious users. Pricing and terms for USER-DAMAGED / MISSING ETALON RESTORATION is available here.

Turnaround for this service is variable to the type of damage encountered.

Instructions for service requests: 
If you have a filter in need of service, remove front and rear OUTER metal plates.  Do not remove the inner, delrin (plastic) plates, then pack the filter in its original case, (if available) or an appropriately packaged container and ship it insured with a letter telling us what problems the filter has to our address below.  Be sure to include your full contact information including postal address, email address and phone number. We also prefer owners to contact us by phone or email to advise that the filter is on the way. Owners outside the US should enter a customs declaration with a value of $200 and a description of "Defective equipment manufactured in the US".  Service will be performed only after receipt of payment for service quotation. DayStar accepts payment by check, bank wire, mastercard, visa, american express and discover card. Click the link below for the credit card authorization form.  Fax it back to us at 866-791-0448.

Ship to: 
DayStar Filters LLC
149 Northwest County Road OO
Warrensburg, MO 64093

* HALF-BANDWIDTH: The term half-bandwidth refers to an optics industry standard of measure.  On a chart depicting the peak where light is transmitted, that peak's width is measured at the point 50% between zero and full transmission. This term is called half-bandwidth.

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Current Delivery Times
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0-10 days for:
Original Quark
uestar Quark
Combo Quark
Calcium Quark

2-4 weeks for:
Blocker and Trimmers
ION Filters
CaII H line filters
Quantum upgrade:  
Quantum SE Filters
SolaREDi 66 Scopes

3-6 months for:
Quantum PE Filters
Ca II K Line PE Filters
Sodium Line FIlters
SR-127 Telescope
Solar System Filter Wheel

Offering absolute precision control over wavelength transmission. . .

DayStar Filters LLC • 149 Northwest OO Highway • Warrensburg, MO 64093 - USA
Telephone: 866-680--6563 • • FAX: 1-866-791-0448