问个小技术问题
http://www.celestron.com/c3/images/files/product/tiny_21045_2008powerseeker_mid.gifPowerSeeker 114 EQ
21045 http://www.celestron.com/c3/images/files/product/tiny_31042_astromaster114e_mid.gifAstroMaster 114EQ
31042 OPTICAL DESIGN Newtonian Reflector Reflector WEIGHT 19 lb (8.62 kg) 17 lb (7.71 kg) CD ROM "The Sky®" Level 1 The Sky L1 ACCESSORY TRAY No-Tool Tray with Eyepiece holder N/A TRIPOD Aluminum 1.25" steel tube legs MOUNT German Equatorial CG-2 Equatorial FINDERSCOPE 5x24 Built-on StarPointer BARLOW LENS 3 x N/A MAGNIFICATION 2 225 x 100 x EYEPIECE 2 4 mm (0.16 in) 10 mm (0.39 in) MAGNIFICATION 1 45 x 50 x EYEPIECE 1 20 mm (0.79 in) 20 mm (0.79 in) FOCAL RATIO 7.89 8.77 FOCAL LENGTH 900 mm (35.43 in) 1000 mm (39.37 in) APERTURE 114 mm (4.49 in) 114 mm (4.49 in) LIMITING STELLAR MAGNITUDE 12.8 12.8 RESOLUTION (RAYLEIGH) 1.22 arcsec 1.22 arcsec RESOLUTION (DAWES) 1.02 arcsec 1.02 arcsec PHOTOGRAPHIC RESOLUTION 253 line/mm N/A LIGHT GATHERING POWER 265 x 265 x ANGULAR FIELD OF VIEW 0.9 ° 1 ° LINEAR FIELD OF VIEW (@1000 YDS) 48 ft (14.63 m) 53 ft (16.15 m) OPTICAL COATINGS Aluminum Aluminum SECONDARY MIRROR OBSTRUCTION 1 in (25.4 mm) N/A SECONDARY MIRROR OBSTRUCTION BY AREA 5 % N/A SECONDARY MIRROR OBSTRUCTION BY DIAMETER 22.3 % N/A OPTICAL TUBE LENGTH 34 in (863.6 mm) 20 in (508 mm) TUBE ATTACHMENT N/A Dovetail Bar STAR DIAGONAL N/A
HIGHEST USEFUL MAGNIFICATION N/A 269 x 这里的SECONDARY MIRROR OBSTRUCTION是不是指副镜遮挡.
副镜在牛反中是指啥,
为啥astroMaster 114EQ 没副镜,我以为两个结构类似
菜鸟菜问 PowerSeeker 难道是马牛？加改正镜是修正像差的。反射系统加不加改正镜全有中心遮挡。
没正经使用过反射...详细的不知道。 不同系列的产品我还真没注意过，我以为差别不是很大::070821_17.jpg::
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