Triple APOD - July 11, 2024: 17 Minutes With the Eagle Nebula by Doug Zeeman
The brightness of the image produced by a telescope or lens is determined by its F/ ratio, the proportion between the optic's focal length and the diameter of its primary objective optic, be it a lens or a mirror. The focal length determines how magnified the image is on the camera's sensor, and the primary objective's diameter sets how large of an area you're collecting light from. For a given focal length, a smaller F/ ratio will mean a larger 'light bucket', meaning more light is collected, and therefore the image will be brighter. Similarly, for a given diameter, a smaller F/ ratio will give a shorter focal length, meaning less magnification and more of the sky is being sampled per pixel, again yielding a brighter less noisy image.
The Celestron Origin is unique among smart telescopes because it uses a Rowe-Ackerman Schmidt optical design, giving a very fast F/2.2 ratio. With roughly the same degree of magnification as other smart telescopes, the Origin uses a 6-inch (150mm) diameter scope, while other smart telescopes can only use optics with 1/10th the light collection area, sometimes less. This makes for much faster image acquisition time, such as this example of the Eagle Nebula in the constellation Serpens, taken in just 17 minutes!
The Celestron Origin is out of pre-order and is available now from All-Star!
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