![]() ![]() ![]() The noise level in sensors has improved over the years and the table below gives a measure of the dark current noise produced in the sensors of several cameras that I own. (I am not totally convinced by this due to the sensor’s 4-pixel Bayer matrix but there should be some improvement.) However, one would often not even then need the resolution provided by a full frame camera with 24 megapixels, and by reducing the image size after processing by half in both axes, so giving a 6 megapixel image, each resultant pixel would be the average of 4 pixels and so should improve the noise in the image by a factor of 2. There seems to be a consensus that, for astrophotography use, a pixel count of no more than about 24 megapixels is optimum so the very high resolution (and expensive) cameras will not be covered in this article. ![]() However often, but not always, a bigger sensor will include more pixels so the area per pixel may not be much greater. So a full frame sensor will have over twice the area compared to an APS-C sensor and so should, in principle, be able to collect more light so giving lower noise images for a given exposure. Such cameras are of two types: ‘DSLRs (Digital Single Lens Reflex) or, becoming increasingly popular, ‘Mirrorless’ cameras that are sometimes called ‘Compact System Cameras’.Ĭomparing APS-C sensors with a full frame sensor one finds that Canon APS-C sensors have an area of 329 sq mm, Nikon APS-C sensors 368 sq mm and full frame sensors 864 sq mm. In the last few years, full frame (FX) cameras have become more affordable and should now be seriously considered for use in taking wide field images of the constellations and Milky Way. ![]()
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