Celestron CGEM II 1100 vs Celestron CGX 800 HD

The Celestron CGEM II 1100 is the clear winner here, and it isn't particularly close. Both telescopes share the same price point and mount type, but the CGEM II 1100's significantly larger 279.4mm aperture delivers substantially better performance across nearly every observing category. The aperture advantage is the single most important differentiator; it provides superior light-gathering power for both planetary observation and deep-sky work, explaining the CGEM II 1100's commanding leads in those scores (77 and 65 versus 18 and 20 respectively).

The CGX 800 HD's notably lower scores suggest it may have design or manufacturing issues that warrant careful investigation before purchase. The CGEM II 1100 is better suited for serious amateur astronomers committed to planetary and deep-sky observation who can accommodate a less portable instrument. The CGX 800 HD might appeal only to buyers facing unusual constraints or those seeking a second opinion through hands-on testing before committing to the larger scope.

Given equal pricing, choose the Celestron CGEM II 1100 unless you have specific portability requirements that outweigh its optical advantages.