www.astrocafe.hk

This time using 100% Mizar optics , ETL-2 seems has no coating at all ....

Sometimes, it is hard to tell whether it is old or new optics when the magnification is low. Any more photographic details?

我一直都認為，一台牛反若用得好，是最高效廉價的器材。只是現在人懶了，連拍深空也遙控了，所以才花好幾倍價格去買性能好一些，而又穏定些的APO折射鏡。

若哪天我要＂返璞歸真＂，我會很樂意用回白鷺湖天文台的300 f8.5牛反，雖然那個5米圓頂及足一噸重的望遠鏡，對不少人來說已是龐然大物。