Hydrogen Alpha Filters

Current Delivery Times:

4-6 weeks for:
Blocker and Trimmers
ION Filters
CaII H line filters
Quantum upgrade:  
Quantum SE Filters
SolaREDi 60 Scopes
SolaREDi 80 Scopes

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

Energy Rejection Filters.

Energy Rejection Filters reduce the heat load on your filter assembly by absorbing or reflecting UV and/or I light and transmitting light in the desired visual spectrum. These filters are sometimes Red or Yellow glass, or dielectric IR and UV, but pass light in the desired visual spectrum.  The ERF can also serve as an aperture mask to accomplish a straight angle of incidence for light entering the filter.

DayStar filter assemblies operate best at f/30 and slower. Creating f/30 configuration can be done easily with the proper ERF and/or barlow as listed below. If you don't see your telescope, visit our full list of reflectors or refractors or contact us for your exact model. Higher resolution, larger aperture configurations use a barlow. 

Scope focal length
  x   Barlow power
  =
USEUSEABLE CLEAR APERTURE
AND ERF SIZE IN MM

30
In order to compute the proper aperture reduction mask, divide your telescope EFL or Focal Length by 30.  To compute the proper aperture using a barlow, use the adjusted EFL which includes multiplication by your barlow.  

Reflector Telescope Configurations:
Click here for full list of reflectors
Telescope on which
DayStar will mount
Off-axis Reduced aperture:
ERF aperture and cost
No barlow needed
Full aperture, On-axis
ERF aperture/ barlow needed / ERF Price
Meade ETX 90 Mak
32mm aperture - $200
90mm aperture PLUS 2X barlow
Meade ETX 105 Mak
35mm aperture - $200 
100mm aperture PLUS 2X barlow
Meade ETX 5" Mak
38mm aperture - $250
125mm aperture PLUS 2X barlow
Meade ETX 7" Mak
50mm aperture - $300
Meade LX 200 8"
63mm aperture - $350
-
Meade LX 200 10"
80mm aperture - $400
-
Meade LX 200 12"
100mm aperture - $505
-
Meade LX 200 14"
114mm aperture - $550
-
Meade LX 200 16"
125 mm aperture - $750
-
Celestron NexStar 4"
35mm aperture - $200
100mm aperture PLUS 2.5X barlow
Celestron C5 NexStar 5"
38mm aperture - $250
127mm apeture PLUS 2.5X barlow
Celestron NexStar 6"
50mm aperture - $300
150mm aperture PLUS 2.5X barlow
Celestron C8 / NexStar 8"
63mm aperture - $350
-
Celestron C9.25
80mm aperture - $400
-
Celestron C11
100mm aperture - $505
-
Celestron C14
114mm aperture - $550
-
Questar 3.5"
32mm aperture - $200
90mm aperture PLUS 2X barlow
Refractor (On AXIS) Telescope Configurations:
Click here for full list of refractors
Telescope on which
DayStar will mount
Reduced aperture:
ERF aperture and price
No barlow needed
Full aperture
aperture / barlow needed / ERF Price
AP 105mm F/6 Traveler 25mm aperture - $150 90mm aperture PLUS 4X barlow
AP 130mm F/8 Starfire 32mm aperture - $225
130mm aperture PLUS 4X barlow
AP 140mm F/7.5 Starfire 32mm aperture - $225
140mm aperture PLUS 4X barlow
AP 160mm F/7.5 Starfire 40mm aperture - $250
150mm aperture PLUS 4X barlow
Televue TV102 F/8.6 32mm aperture - $225
102mm aperture PLUS 4X barlow
Meade 4" F/9 32mm aperture - $225 
90mm aperture PLUS 2.5X barlow
Celestron SLT 80mm F/11.25 80mm aperture PLUS 2.5X barlow
Celestron Advanced 80mm F/7.5 80mm aperture PLUS 4X barlow
Celestron 90mm F/12.3 40mm aperture - $250
90mm aperture PLUS 2.5X barlow
Celestron Advanced 100mm F/9 32mm aperture - $225
90mm aperture PLUS 2.5X barlow
Celestron Omni 120mm F/12.9 50mm aperture - $300 120mm apeture PLUS 2.5X barlow
Celestron Advanced 150mm F/8 40mm aperture - $250
150mm aperture PLUS 4X barlow
Williams Optics FS 102 F/8 32mm aperture - $225
100mm aperture PLUS 4X barlow
Williams Optics TOA 130 F/7.7 32mm aperture - $225
130mm aperture PLUS 4X barlow
Williams Optics ZenithStar 80 F 6.8 75mm aperture PLUS 4X barlow
Williams Optics Megres 90 F 6.9 80mm aperture PLUS 4X barlow
FLT 110 F/7 100mm aperture PLUS 4X barlow
FLT 132 F/7 32mm aperture - $225 
125mm aperture PLUS 4X barlow
Vixen ED81 F/7.7 80mm aperture PLUS 4X barlow
Borg 101 F/6.3 32mm aperture - $225
90mm aperture PLUS 4X barlow
Borg 125 F/6.4 100mm aperture PLUS 4X barlow
TMB 130mm F/7 32mm aperture - $225
125mm aperture PLUS 4X barlow

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