NGC 4490 in Cannes Venatici
CCD : STL11000 ABG Exposure time : 90 min (15 min individual images 1x1 binned) Date and Time : 23. May 2006 Instrument : 50cm @ f/8.4 Focal length : 4195 mm FWHM : about 2.5 arcsec Filters : SBIG L filter Image processing : Imageplus (DDP, starsize) and Photoshop (Levels, Scharpen) Problems/comments : Remotely imaged at New Mexico, USA. 本文摘自astronomie.behttp://www.astronomie.be/hambsch/STL11K/NM_obs/n4490_90sgclpL_DDP_SZ_BG_IP_PScrop.jpg 看不见图片啊楼主~~~~~!!!!!!::070821_20.jpg:: 不可能啊,你的网速太慢了吧!
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