由 willis » 2012-01-09, 15:18
Recently I saw the two threads in astrocafe & hkastrofrum. The discussions now a bit off in the sense there are not technical or helping others to understand the pros & cons of different products. If the coin is one sided, the situation is simple! As an LVI user, I know its pros & cons. It is simple, handy, notebook free and the most important of all is that it gets the work done in just a fraction of cost! The con is it's low sensitivity. I don't care about I need to find a bright star of magnitude 2 or brighter with a 50mm guide scope. According to other SG4 users, and I in fact seen before, that SG4 virtually can find guide stars with a small scope in anywhere in the sky. Well all these are not important, but whether can I make good images.
As matter of fact, SG4 got good 2nd hand market. And in fact recently there are some SG4s in the 2nd hand market. But I know that a few of these users, they are switched to LVI. But they keep it silent, because of the atmosphere. But they used their money to give the vote. On the other hand, there are not many LVI in the 2nd hand markets. My understanding is that LVI users tend to keep their LVI. And I know some LVI user stopped using LVI and switch to PHD. But they still keep LVI for emergency using. It is because LVI is too simple & beginners can handle it without any trouble. In contrast, PHD (with a sensitive guide cam) or SG4 users, need to ask other experienced users to get it work. One can easily notice it in forums. So sensitivity & simplicity, expensive & cheap, one can make their own choices. But one needs to know what he or she is talking about especially when criticizing other products, which he or she had never used. At the end, photos speak for themselves. To me, I prefer cheap solution for auto-guider & mount, but premier optics. The most convincing evidence is that produce good photos with the instrument you are promoting or using. Bad mouthing others instrument is not the way. Think about using a top class E-180 with cooled CCD (a small 8300 chips) and a 5" PV mount, and resize the image to less than 1M pixels. But the stars are still obviously elongated at such scale. How convincing it is? Don't you know what other people think? Or u just don't care what other people think. If that is the case, enjoy the instrument yourself, instead of big mouth always.
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
)，但不只一個人，包括資深攝星者都賣了SG4轉用LVI，已說明LVI有高於SG4的價值。
