光是鏡片玻璃就應該不輕吧 .

找出類似大小的 SCT 來參考一下 (P.S. 同樣口徑之下通常 SCT 比 Refractor 為輕)
http://www.meade.com/maxmount/index.html
http://www.meade.com/maxmount/specifications.html
APERTURE 406.4 mm (16 in)
FOCAL LENGTH 3251 mm (153.94 in)
FOCAL RATIO 8
total weight 609 pounds

APERTURE 508 mm (20 in)
FOCAL LENGTH 4064 mm (153.94 in)
FOCAL RATIO 8
total weight 694 pounds

http://www.celestron.com/c2/product...D=17&ProdID=114
APERTURE 355.6 mm (14 in)
FOCAL LENGTH 3910 mm (153.94 in)
FOCAL RATIO 11

http://www.r-clarke.org.uk/starting_astro1.htm
Refractors
Newtonian Reflectors
Catadioptric Reflectors