由 willis » 2010-12-22, 23:15
Let me define the abbreviations first. LS80T means Lunt LS80THa/PT. And LS75F/U means AM-LOMO 80/600 and unobstructed LS75F.
LS80T gives you a strong and concrete feeling and LS75F is just a block! Really it looks like a block instead of a filter. The LS80T is a simple grab & go solar scope while the LS75F/U is a bit clumsy.
The tastes of LS80T & LS75F/U are different. Both LS80T & LS75F/U deliver uniform images visually. I don’t have experience in imaging with these two scopes. So I cannot comment the uniformity of photography. Certainly I will produce some images later.
The LS80T gives obviously brighter images. The main reason I guess is because of the bandwidth of LS75F/U is 0.5A narrower than that of LS80T. (The bandwidth of LS75F/U is <0.65A and the bandwidth of LS80T is <0.7A) However, the LS75F/U gives better solar surface details. But the prominences viewed under the LS80T are sharper and brigther.
The newly equipped pressure tune of LS80T is gorgeous! It just likes the Feather touch version of etalon tuning. The pressure tune is firm compared with the mechanical tune of LS75F/U. This sophisticated design makes fine Doppler tuning possible.
Final verdict: If u care about the convenience, go for LS80T. If u care about the surface details, go for LS75F/U. If u care about the prominence, go for LS80T.
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