Telescopes classed as apochromats with a doublet lens have a two-lens objective design. The classification no longer makes a distinction between semi-apos and two-lens apochromats.
The second element is usually made of ED glass (ED stands for extra-low dispersion). However, minor chromatic aberrations are still visible, since only a triplet apochromat with a three-lens construction can completely correct them.
Omegon
Apochromatic refractor Pro APO AP 66/400 ED SkyGuider Pro
Our price:
RRP:
$ 1,735.00
$ 1,650.00
ready for shipping in 24
h
Omegon
Apochromatic refractor Pro APO AP 80/500 ED Carbon OTA + Field Flattener
Our price:
RRP:
$ 1,449.00
$ 1,390.00
ready for shipping in 24
h
Omegon
Apochromatic refractor Pro APO AP 110/660 ED Carbon OTA
$ 1,790.00
ready for shipping in 24
h
Omegon
Apochromatic refractor Pro APO AP 80/500 ED Carbon OTA
$ 1,190.00
ready for shipping in 24
h
Omegon
Apochromatic refractor Pro APO AP 66/400 ED OTA
$ 669.00
ready for shipping in 24
h
Omegon
Apochromatic refractor Pro APO AP Photography Scope 72/432 ED OTA
$ 599.00
ready for shipping in 24
h