親子觀星會

4 Telescopes Tested: Doublet vs. Triplet vs. Quadruplet vs Quintuplet  https://www.youtube.com/watch?v=WDLUv1GY3AQ

Quadruplet  4片
 Quintuplet => 5片



William Optics ZS61ii:

Sharpstar 61EDPHii  Triplet

Meade 70 APO:
Meade's Series 6000 70mm Astrograph is a 70mm aperture, Quadruplet Apochromat


Askar 65PHQ
the 65PHQ is a quintuplet with two ED glasses which offers excellent control of chromatic and other aberrations. With its self-flattening design, 65PHQ offers strong advantages in the astronomical shooting.

4 Telescopes Tested from $300 to $2300

https://www.youtube.com/watch?v=yjcP8u8EqpQ