![]() As long as the barrel sizes match, you can combine any eyepiece with any telescope. The good news is that you can mix and match with no problem. BrandĪ lot of people worry that the brand of their eyepiece should match the brand of the telescope. However, if you have a 2” telescope, there is a good chance that it came with an adapter to allow you to use the smaller size of eyepiece. Otherwise, you won’t be able to use them together. You will need to make sure that the barrel size of your eyepiece matches the size of your telescope. The barrel size of an eyepiece will always be given in inches. An eyepiece set that comes with color filters can offer you a lot more detailed and high contrast views of the planets you’re interested in, so they can be a nice addition to have as well. Using a color filter can boost the contrast of different features of the object you’re looking at. ![]() When you’re looking at the planets, it can be hard to focus on the details that you’re interested in. Beyond that, you’ll lose detail and contrast. As a rule of thumb, you take your aperture size in inches and multiply it by 50.įor example, if your telescope has an aperture of 4”, then the maximum useful magnification will be 200x. You can work out the maximum useful magnification for a telescope based on its aperture size. If your image is blurry or dim, then you’re just going to magnify that. There is no point magnifying an image past the point where you are able to make out detail. That means that a 20mm eyepiece will give you a magnification of 50x, but a 10mm eyepiece will give you 100x. As an example, let assume your telescope has a focal length of 1000mm. What this means is that a smaller eyepiece will give you a larger magnification. Magnification = Telescope Focal LengthEyepiece Focal Length ![]() You can calculate the magnification as follows: This is why eyepieces don’t tell you what magnification they will give you. To calculate the magnification of a given eyepiece, you also need to consider the focal length of your telescope. However, the focal length of the eyepiece alone does not decide how much magnification you’ll get. The number you’re interested in here is the one that is in mm. This is what allows you to change the magnification of the image. When you change the size of your eyepiece you’re changing the focal length. What to Consider When Buying an Eyepiece for Viewing Planets Focal Length It’s a great option for anyone who is looking for a full set of eyepieces but doesn’t want to spend an arm and a leg buying them individually. It’s foam-lined and has a solid exterior, so it will keep your eyepieces safe. So this is a great kit for making observations of the solar system.Īll the pieces come in a handy carry case. This is necessary as the moon is a very bright object and can flood your telescope with too much light. ![]() This decreases the transmission of light from the moon without applying a color filter. This will give you a filter that should be effective for enhancing the detail of most of the interesting features of the planets in our solar system. Neptune: 16 September 2022, 19 September 2023, 21 September 2024Īs inner planets between Earth and the Sun, Mercury and Venus are usually close to the Sun and typically visible in the east just before sunrise or in the west just after sunset. Outside of those dates, here are some more things to aim your telescope at.The filters that come with the set are in the three primary colors.During this time a planet is at its apparent largest, it's fully illuminated by the Sun (so is at its brightest) and it's in the night sky all night (rising in the east at dusk and setting in the west at dawn). At time of writing, these are the best upcoming dates to check out the planets: That's always going to be a month or two either side of their date of opposition, the moment each year or so (depending on how quickly it orbits) when Earth gets between a planet and the Sun. The best time to see the outer planets is when they're at their brightest. If you want to specialise only in planets then aim for 200x. Choose a 130mm/5-inch telescope with a focal length of 1,250mm (and a focal ratio of f/9.6) and that same 10mm eyepiece will magnify a planet 125x. The magnifying power is calculated by dividing the focal length by the eyepiece, so a 76 mm/3-inch telescope with a focal length of 700mm and a 10mm eyepiece will offer a magnification of only 70x (and a focal ratio f/9.2). Most beginners' telescopes come with two eyepieces, typically 25mm and 10mm. The magnification you can achieve – say, 100x or 200x – depends on the focal length of your telescope and the power of your eyepiece. What magnification do you need to see planets?
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