由 willis » 2011-03-26, 17:16
This was the first time I try such big fluorite triplet APO. With a high expectation in head, I would say the expectation wasn’t reached. However, the testing distance was not long enough & indeed when we extended the testing distance from 23m to 36m, the trend of the artificial star tests was improving. In the past we used to test telescopes with a few hundred mm focal length indoor. However this time, the focal length of this TEC 160mm is 1120mm, the finite distance would definitely affect the star test. But we don’t have time to repeat the test again as it needs to go. BYE!!!!
Tak FS60C, APM-LOMO 80/480, APM-TMB 105/650, SW Black Diamond 120ED, Borg 125SD, SW 12" Dobs , Lunt LS35T, Lunt LS80T
TMB Super Mono 4mm, Pentax XO 2.5mm, Baader Planetarium 8-24mm, Nagler (2-4mm, 3-6mm, 13mm), Ethos (3.7mm, 6mm, 10mm), Explore Scientific 100º (14mm, 20mm)
DBK 21, DMK 21, DMK 41, DMK 51, ASI 178MC
Nikon D810A, Canon 5D II, Fujifilm X-T10