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.
Lunt Solar Systems
Solar telescope ST 70/420 LS60MT Ha B1200 Allround OTA
RRP:
$ 4,990.00
Our price:
$ 3,810.00
ready for shipping in 24
h
Lunt Solar Systems
Solar telescope ST 70/420 LS60MT Ha B600 Allround OTA
RRP:
$ 4,290.00
Our price:
$ 3,240.00
ready for shipping in 24
h
Lunt Solar Systems
Solar telescope ST 80/560 LS80MT Ha B1800 BT R&P Allround OTA
RRP:
$ 9,800.00
Our price:
$ 8,500.00
ready for shipping in 24
h
Lunt Solar Systems
Solar telescope ST 80/560 LS80MT Ha B1200 R&P Allround OTA
RRP:
$ 9,000.00
Our price:
$ 6,900.00
ready for shipping in 1-2
weeks