These brand new QUARK optimized accessories are designed to fit our classic Combo Quark Hydrogen Alpha Filter. Use a telecentric barlow by unscrewing the silver snout from the Combo Quark and screwing on the barlow.
For refractors from F/5 to F/9 you have a choice of the 2.8X or 4.3X telecentric barlows. The 4.3X barlow will show full disk with approximately 480mm focal lengths or shorter. The filter performs better with a narrower bandpass with the 4.3X barlow, prioritizing surface contrast at the expense of a dimmer image as compared to the 2.8X barlow. We encourage experimentation to determine which setup best meets your goals.
$299
For refractors from F/5 to F/14, the 2.8X barlow will show the full disk of the sun on refractors with a focal length of approximately 720mm or shorter. The 2.8X barlow will show a brighter, lower power image that is advantageous when using bino viewers that split the light between two eyes.
$299