My definition of large is 24" and up...
發表於 : 2011-09-23, 00:07這篇望遠鏡測試報告很有參考價值，只是語氣有點囂.... 
看來David的18UC只是中口徑，我日後在西藏建立的24"才是大的起點。
http://www.astromart.com/articles/artic ... cle_id=829
Conclusion
1. The Paracorr 2 has no problem fixing the coma on a f/2.7 telescope.
2. If secondary mirrors get any larger, we are going to need new tools to align them.
3. The underdog, Mike Lockwood, made a great mirror that ran almost neck and neck vs. the more experienced Kennedy. A shoot out at the exact same focal length would be of much interest. (Hint, hint - Webster)
4. Vibration can be reliably measured and its causes identified by expensive equipment.
5. You are pronouncing the names of all of the stars incorrectly.
6. The Denk 2 binoviewers work admirably even at crazy fast focal ratios.
7. Seated observing with a 28" telescope is suddenly a reality.
8. 28" telescopes give great performances on Jupiter.
9. Large, high quality and very fast mirrors can snap into focus. Do not accept mush under the guise of it being a large mirror.
10. Practicing Muslims and Roman Catholics do not eat eagles - ever.
11. Flat footed observing with a 28" telescope. Wow, just wow.
看來David的18UC只是中口徑，我日後在西藏建立的24"才是大的起點。
http://www.astromart.com/articles/artic ... cle_id=829
Conclusion
1. The Paracorr 2 has no problem fixing the coma on a f/2.7 telescope.
2. If secondary mirrors get any larger, we are going to need new tools to align them.
3. The underdog, Mike Lockwood, made a great mirror that ran almost neck and neck vs. the more experienced Kennedy. A shoot out at the exact same focal length would be of much interest. (Hint, hint - Webster)
4. Vibration can be reliably measured and its causes identified by expensive equipment.
5. You are pronouncing the names of all of the stars incorrectly.
6. The Denk 2 binoviewers work admirably even at crazy fast focal ratios.
7. Seated observing with a 28" telescope is suddenly a reality.
8. 28" telescopes give great performances on Jupiter.
9. Large, high quality and very fast mirrors can snap into focus. Do not accept mush under the guise of it being a large mirror.
10. Practicing Muslims and Roman Catholics do not eat eagles - ever.
11. Flat footed observing with a 28" telescope. Wow, just wow.