Ed Apo Vs. Achromat

ED APO vs. Achromat

ED vs APO Refractor Telescopes!? FPL-51 vs FPL-53 vs FCD-100!?

Wido's AstroForum

APO vs Achro??? What is the difference between an Achromatic and Apochromatic refractor telescope?

Whats the Difference between an Achromat and and Apochromat Refractor Telescope

Small vs. Huge Telescope for Astrophotography

4 Telescopes Tested: Doublet vs. Triplet vs. Quadruplet vs Quintuplet

Worlds Best Doublet vs Best Triplet APO Refractor Telescope. Is the Triplet worth the extra cost???

80F5 Achromat vs 72F6 ED Apo

5" Refractor Shootout

Achromatic vs Apochromatic microscope objective

$300 for a Telescope: Refractor or Reflector?

3" vs 4" vs 5" vs 6" vs 7" Refractor Telescope for Visual and Astrophotography. What's better???

80F5 Achromat vs 72F6 ED Apo (2)

Guide to Refractor Optics - Choosing the Best Telescope for You!

Telescope Perfection! The Astro-Physics AP130GTX 130mm f/6.3 Apochromatic Refractor.

Review of the Astro Tech AT115EDT apochromatic refractor

Premium 4" vs 5" Refractor Comparison on Saturn!

Objective Corrections - Differences between Achromatic, Plan, and Apochromatic Lenses

4.7" Refractor vs 8" Reflector on Saturn

7” APO Vs 12” SCT Telescope on the PLANETS – When aperture does not matter???