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Resolution Choices with a DayStar Filter:
With DayStar Filter rear-mounted filters, an observer has a choice of high or low resolution configurations on a choice of dozens of telescopes.

• A: USE FULL APERTURE requires a barlow.
  Insert the barlow, then insert the DayStar Filter behind it and you're ready to observe in high resolution for amazing detail.
  The barlow power required for full aperture observing is 30/the f ratio of your telescope.
  For example, an F/8 needs a 4X barlow. ( 30/8 = about 4) .

• B: OR USE AN APERTURE MASK uses no barlow. Stop down your front aperture. Use no barlow.
  Just insert the DayStar Filter in the focuser of your telescope and you're ready to observe full-disk.
  The aperture you need to reduce down to is your Focal Length (EFL) divided by 30
  For example, a 2500mm EFL telescope would use an 83mm aperture mask.
  
  
• C: OR TRY A COMBINATION OF THE TWO IDEAS use a smaller barlow and a slight aperture reduction mask.
  Use half your aperture and a lower power Barlow for a nice compromise between resolution and field of view.
  

• ANY DayStar Hydrogen Alpha filter can be used on any telescope configured this way. 0.7Å or 0.4Å, it's your choice.
  

For further explanation on focal ratios, visit our Application Page

Sample Refractor Telescope Configurations with Resolution Choices:
Telescope on which DayStar will mount	Reduced aperture Focal Length	Half Aperture - barlow needed Focal Length	Full aperture - barlow needed Focal Length
AP 155mm F/7 Starfire FL = 1085mm	35mm aperture FL = 1085mm	70mm aperture mask - 2X barlow FL= 2170mm	155mm aperture - 4X Barlow FL = 4340mm
TeleVue TV76 F/6.3 FL = 479mm		40mm aperture - 2.5X barlow FL = 1197mm	65mm aperture - 4X barlow FL = 1915mm
Meade 4" F/9 FL = 900mm	32mm aperture FL = 900mm	63mm aperture - 2X barlow FL = 1800mm	100mm aperture 3X barlow FL = 2700mm
Celestron SLT 80mm F/11.25 FL = 900mm		60mm aperture - 2X barlow FL = 1800mm	80mm aperture 2.5X barlow FL = 2250mm
Celestron 150mm F/8 FL = 1200mm	40mm aperture FL = 1200mm	100mm aperture - 2.5X barlow FL = 3000mm	150mm aperture - 4X barlow FL = 4800mm

Sample Reflector Telescope Configurations with Resolution Choices:
Telescope on which DayStar will mount	Reduced aperture Focal Length	Full aperture - barlow needed Focal Length
Meade LX 200 10" FL = ~ 1650mm	80mm aperture FL = ~ 1650mm
Celestron C5 / NexStar 5" FL = ~ 1250mm	38mm aperture FL = ~ 1250mm	127mm aperture / 2.5X barlow FL = ~ 3125mm
Celestron C14 FL = 3500mm	114mm aperture FL = 3500mm

DayStar Filters LLC • 149 Northwest OO Highway • Warrensburg, MO 64093 - USA
Telephone: 660-747-2100 • jen@DayStarFilters.com • FAX: 1-866-791-0448