11/19/2023 0 Comments Telescope to see planets![]() It's a very small object, contrast is not bad, so crank it all the way up. Mars can use the highest magnification that you could generate, given the instrument and the conditions. It depends on what you do - if you're trying to see the ring divisions, push it a bit higher. ![]() Saturn works best at high-ish magnification, bit more than Jupiter but maybe not much more. This is because it's a very low contrast object, and additional magnification comes at the cost of less contrast, which makes things worse. It's rare that more than 200x is beneficial. Jupiter is seen best under mid-high magnification. There are times when you could take a 20" dobsonian all the way up to 1000x - but that's very, VERY rare, it's the stuff of legends.Īssuming average seeing conditions and instruments of usual size (refractors of 3.4" aperture, reflectors 6" or larger), here are some rules of thumb: There are times when a 12" dobsonian, that in theory could do 600x, is clamped down by seeing to 150. It varies greatly with time, place and season. ![]() Your aperture is small enough that it almost never suffers from seeing, but larger instruments are often affected. Beyond that limit, even under ideal skies the image is large but blurry.Īfter that, seeing (or air turbulence) pushes that limit further down. You're probably asking the wrong question - which I am going to answer anyway, and after that I am going to answer the question you should have asked instead.Īs a general rule, there isn't much point in pushing the magnification above 2x the diameter of the instrument, measured in mm.
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