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The following message is from Roland Santallo: Dear Taichi Maybe It is a good idea to speack on different CCD/Telescope sytem used by Observer I consider two System First Telescope with long focal generaly these systems works with pixel size from 1/5 1/4 of seeing example : we can obtain a pixel size of 1.5"arc to 0.7 "arc if we considere the Star has 3"arc in most Amateur Observatories Second Lens/CCD the pixels size is between 24"arc to more example 50mm lens + ST7 (pixels are 9 microns) pixels size is 37"arc (seeing 3"arc) field 8degres by 5degres accurracy is better in the first system? what do you think ?? also with my system I take currently 250 to 300 exposure during a night ( I suppose without clouds) best regards Roland Roland Santallo Southern Stars Observatory IAU # 930 Tahiti French Polynesia http://vsnet.southernstars-observatory.org
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