![]() ![]() According to this, the astrophotography camera pixels will have to record the signal of an area of sky equal to 1.15/2 = 0.56 arc seconds. According to the Nyquist principle, the pixel size of the sensor must cover more than half of the smallest detail that our telescopes can resolve. Its resolution capability is calculated with the formula a=120/D that is 120/107=1.12 arc seconds. Let’s start from a practical example with the Borg fluorite apochromatic refractor 107FL f3.9 with ESATTO 3″, 107mm diameter and 417mm focal length. Its value indicates how many arc seconds a single pixel of our sensor can record.Īfter this introduction you may understand that, if you already have a telescope, the choice of astrophotography camera depends also on the sensor pixels size.Īstrophotography camera for deep-sky: Cooled CMOS cameras from QHYCCD have a cooling system with Peltier cell that greatly reduces electronic noise. – sampling: this is the concept more difficult to understand but it is essential for choosing the right camera as a function of the telescope. – seeing: it’s the set of phenomena that contribute to the deterioration of the image quality of both in visual and photographic application, such as atmospheric turbulence, humidity and light pollution. – resolution capability: it’s the minimum distance in arc seconds, with which two objects may be identified as separate and it’s a function, closely related to the telescope diameter, calculated with the following formula: a= 120 / D where “a” is the resolution capability in arc seconds, “120” is a constant and “D” is the telescope diameter in millimeters. In this article we will meet some technical terms which must be taken into consideration when choosing an astrophotography camera for deep-sky astrophotography: Astrophotography camera for the deep-sky are usually cooled, ie have a system with Peltier cells which cools and stabilises the sensor at low temperature in order to reduce the noise of the image and therefore improve quality. In this article, through a series of practical examples, we will see how to choose astrophotography camera to record also the weakest details of galaxies, nebulae and star clusters through with long exposures (these camera are different from the ones used for planetary and lunar photography that record short videos). Choosing from various astrophotography camera for the deep-sky may seem complicated.
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