![]() You’ve also got to balance all this with other concerns, such as the mount you have available, and the budget with which you can buy your imaging telescope. And, of course, a slow telescope can handle imaging the brighter deep-sky objects well enough, so you’re not completely limiting yourself to planets if you get an f/10, for example. In this case, telescopes with f-ratios between f/5 and f/10 are jack of all trades, though of course they’ll skew more towards one type of object than the other depending on how fast or slow they are. Maybe you want a telescope that’s adept at imaging both planetary and deep-sky targets. The less time you are imaging, the less likely that the object will drift off target, or a satellite trail will ruin your exposure, or so on. Telescopes with low f-ratios, say about f/5 or less, are referred to as fast because they are able to gather light onto the pixels of your camera’s imaging sensor more quickly, producing a brighter image and meaning that fainter objects can be imaged in less time - perfect for those faint nebulae. Use a slow telescope to image a magnitude 12 planetary nebula, and you’ll struggle to collect enough light to pick out any details or produce a bright image. Instruments with high focal ratios, say f/10 or f/11, are referred to as ‘slow’ - they take longer to gather the light, meaning they’re better for imaging brighter objects, such as the Moon and planets, without becoming over-exposed too quickly. Eye reliefĮye relief refers to the distance between the eyepiece lens and your eye when the entire field of view is visible.Ī longer eye relief is beneficial for users who wear eyeglasses, as it allows them to see the full image without vignetting, which can block or blur your peripheral vision.If you’re setting out to image the deep sky, then a fast telescope is a must. Field of viewĪ wider field of view allows you to see a larger area at once, making it easier to track fast-moving subjects or observe expansive landscapes. These coatings improve light transmission, reduce glare and enhance image clarity and colour fidelity. Look for monoculars with high-quality lens coatings, such as fully multi-coated or multi-coated lenses. Larger objective lenses gather in more light and produce brighter images, but they may also make the monocular bulkier and heavier. ![]() The size of the objective lens affects the amount of light that enters the monocular, impacting image brightness and low-light performance. ![]() Higher magnification allows you to view distant objects more closely, but it may result in a narrower field of view and can be more challenging to stabilise. What should you look for in a monocular? MagnificationĬonsider the magnification power of the monocular. They are often also much cheaper than binoculars or telescopes, so if you’re on a budget, they could be a great fit for you. Thanks to its single-handed design, monoculars offers easy handling and free up your other hand. They often feature wrist straps and can be packed away easily. A monocular is a portable and lightweight optical device, making it convenient for outdoor activities, hiking, birdwatching and travel due to its compact size. ![]()
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