There are two main ways to fend off dew from forming during the night: dew shields and dew heaters. Dew usually forms on refractive elements like lenses and corrector plates, so for refractors and Schmidt-Cassegrains, having dew prevention tools is essential. This can be essential for astrophotographers where temperature changes throughout the night can alter focus slightly. Last but not least, focusing masks or Bahtinov masks are a simple device that you place over the front of your telescope and they will allow you to precisely dial in perfect focus every time.įor many astronomers and astrophotographers, dew can be one of the biggest enemies. In addition, they can focus automatically by finding the focus point where stars are the smallest, and adjust this over time. Separate from focusers themselves, automatic focusers or autofocusers are an accessory that attaches to your existing focuser and enables you to adjust focus via computer software, so you don't have to touch the telescope. By upgrading your focuser, you can ensure that these issues become a thing of the past. You may also find that some stock focusers lack the ability to dial in focus as accurately as you need it to, especially for astrophotography. Swapping out your telescope's focuser is a very common upgrade for many amateur astronomers and astrophotographers. Many stock focusers suffer from slip, when the focuser cannot support the weight of your camera and accessories. Barlows and focal extenders are usually able to be used with almost any telescope. If you're planning on using one of these correctors for imaging, just know that some of these are designed for specific telescopes, so be sure to check for that first. Some types of correctors include reducer/flatteners, which are most common for refractors, coma correctors for Newtonians, and field flatteners for refractors, Ritchey-Chretiéns, and other types of telescopes. To help you get that, you may need to use an optical corrector. With focal reducers, you can widen your field-of-view to fit that entire galaxy you were hoping to observe.įor astrophotographers, having round stars across your entire image is desirable. With Barlows and focal extenders, you can double your focal length or even more to get the best planetary views and images. Many beginners don't realize that if your view through the eyepiece or camera is too wide or narrow that you can usually do something to change that.
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