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Binocular for stargazing4/10/2023 In general, it is difficult to carry any kind of handheld observations when the magnification is above 10x. When we talk about magnification, some people may think that greater the magnification = better the observations. More light = better astronomical observations. The objective lens diameter is the diameter of the front glass which has a direct impact on how much light is captured during the night. I had pointed above that I do not recommend any optical devices, from binoculars to monoculars and scopes with the objective lens diameter smaller than 42mm The objective lens diameter of monoculars used for stargazing As mentioned above, during the night your pupil opens up to 7mm, which means a lot of light is lost in the process.Īs given the above example, a 10×50 monoculars can perform well in stargazing, where the exit pupil is 5mm. I strongly recommend for night sky observations optical devices with an objective lens diameter greater than 42mm.
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