5 common mistakes beginner telescope users make — and how to avoid them
SOURCE:Live Science|BY: Kimberley Lane
The simple mistakes every stargazing newbie makes — avoid these traps and you'll get the best out of your telescope from night one!
(Image credit: Getty Images)
A new telescope can be a doorway to the universe — that is, until you actually take it outside and nothing looks the way you imagined it. Telescopes aren't necessarily difficult to use, but they do require a little preparation, a bit of patience and an understanding of how the night sky moves.
If your first few sessions have been more frustrating than awe-inspiring, you're not alone. Here are five of the most common mistakes, plus how to avoid them so you can spend less time fiddling and more time actually enjoying the view.
1. Neglecting the planning stage
Sky maps and star charts help with the planning process. (Image credit: Stellarium)
Many beginners grab their telescope on a whim, head outside and hope for magic. The problem is that astronomy doesn't work on impulse — it works on timing. Moon phases affect how bright the sky is, and local light pollution can wash out fainter objects. Even the time of year dictates what's actually visible.
Before heading out, take a moment to observe what's above the horizon, when the moon rises and whether your sky conditions are cooperating. Free apps make this easy — Stellarium is a favorite of ours — and a quick look at a cloud forecast can save you a wasted session.
Planning isn't a chore; it's the difference between hunting blindly and having a solid target list. When you know when are where to look, observing the sky with a telescope becomes far more rewarding.
2. Expecting Hubble-like views
Unfortunately, you won't see Hubble-like views through a standard telescope. (Image credit: Getty Images)
It's completely normal to hope for swirling nebulas and razor-sharp galaxies like the images you see online. Unfortunately, those are long-exposure photographs taken by spacecraft or huge professional observatories. A backyard telescope shows the real sky, and it's much more subtle.
But that doesn't mean it's disappointing. The moon looks incredible through even a small telescope, Jupiter and Saturn show details and star clusters sparkle beautifully. What tends to trip people up is expecting colors and drama rather than appreciating the delicate, natural brightness of what can be seen with the eye.
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Think of visual observation as seeing the universe with your own eyes, and once you adjust your expectations, you start to notice far more. If you do want to experiment with imaging space, you can mount one of the directly onto your telescope, or invest in one of the .
Another thing that often catches beginners out is that not all telescopes excel at the same targets. Not only are there different types of telescopes, but some designs are better suited to deep-space objects like galaxies and nebulas, while others are better suited for crisp planetary and lunar viewing.
Wide aperture, low focal-ratio scopes (like Dobsonians) gather lots of light, making faint objects easier to spot. On the other hand, longer focal length telescopes naturally deliver higher magnification, which is perfect for observing the details on Jupiter, Saturn or the moon's craters.
3. Not letting the telescope acclimate
You need to let your telescope acclimatize to the outside temperature. (Image credit: Jason Parnell-Brookes)
One of the least glamorous but most important steps is simply letting your telescope cool down (or warm up) to match the outdoor temperature. If you take a scope from a warm living room out into the cold night, turbulent air currents swirl inside the tube, softening the view. The result looks like your optics suddenly went blurry.
Give your telescope 20-40 minutes outside before you start observing — maybe even a bit longer for bigger scopes. During this time, you can align your finderscope, set up a star chart or choose your targets.
Once the air settles inside the tube, things improve dramatically. Planets snap into focus, double stars separate cleanly and lunar details show the crisp edges it's meant to. Acclimation isn't sexy or exciting, but it's one of the easiest ways to upgrade your observing without spending a dime.
4. Choosing the wrong eyepiece or magnification
Eyepieces can make or break your viewing experience. (Image credit: Russ Swan)
A common assumption is that more magnification automatically means better views. In reality, pushing the zoom too high will result in a dim, wobbly image.
Every telescope has a highest useful magnification. This is essentially the upper limit where the view will still look sharp, and it's determined by the scope's aperture and the viewing conditions. The general rule of thumb is that the highest useful magnification is roughly 50x its aperture in inches, although this does depend on the overall quality of your telescope. For example, a 6-inch telescope will have a highest useful magnification of around 300x.
Start with a low-power eyepiece, like the 20mm which typically comes with beginner telescopes. This will give you a wider field, making objects a lot easier to find and track. Only once you've centered your target should you then switch to a higher-power eyepiece — and even then, it's best to increase in small steps. On nights with poor viewing conditions, high magnification will just make objects look blurrier.
To determine the magnification of an eyepiece, divide the telescope's focal length by the measurement of the eyepiece. For example, on a 1,000mm scope, a 20mm eyepiece will provide 50x magnification. Over time, you'll instinctively know which eyepiece works best for the moon, planets and deep-sky objects.
When magnification is chosen well, everything suddenly becomes sharp, steady and a lot more impressive.
5. Expecting the telescope to do everything
Even telescopes with a motorized GoTo mount need accurate alignment. (Image credit: Future)
Modern telescopes can be surprisingly smart — some align themselves, some slew automatically to targets and others use your phone to guide you around the night sky. These features are awesome, especially for beginners, but they can create a false expectation that the telescope will do all the work.
In reality, even the most automated systems will still need some input and understanding from the user. Motorized GoTo mounts, for example, won't magically know where they are. They need accurate setup, which requires a level tripod, the correct date and time and a proper alignment on a couple of bright stars. If any of that is off, the telescope will miss every target.
Smart telescopes and app-driven models make navigation easier, but they're not a substitute for knowing what's actually visible or why certain objects won't appear on a bright, hazy night. Plus, smart telescopes often produce the best view by stacking images over a longer period, so they're better suited to photographing the cosmos as opposed to observing it.
Kimberley Lane, E-commerce writer for Live Science, has tested a wide range of optical equipment, reviewing camera gear from Sony, Canon, OM System and more. With over 6 years of photography experience, her skills span across landscape and seascape photography, wildlife, astrophotography and portrait work. Her photos have been featured in a number of national magazines, including Digital Camera World and Cosmopolitan. She has also contributed to our sister site Space.com and Tech Radar, and she regularly uses binoculars and telescopes to stargaze in the dark skies of South Wales.
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