![]() Your focal ratio, like in standard photography, is determined by your telescope's focal length and aperture. So, your camera exposures with a lower number might be 10 seconds instead of the 20 seconds that a higher (slower) focal ratio would need to get the same amount of data (light). The f/ measure is what determines whether a scope is "fast" or "slow." Scopes with a low f-number gathers the light coming in more efficiently. The focal ratio displays as an f-number that looks like f/6.5, the number portion varies wildly. If you've ever looked at a photography ad or read an article on cameras, there's a good chance that the focal ratio was involved. The focal length also influences another major factor in all of this, which is the focal ratio.Ī long focal length telescope like the Celestron CGEM-II 925 EdgeHD telescope, provides ideal observation to bright objects such as the Moon, planets, and star clusters.Ī short focal length telescope like the Meade LX85 70 MM Quadruplet APOprovides better observations for wider views of the universe like wide-field captures of the Milky Way or Pleiades. Any longer and you’ll start finding some objects difficult to catch in one frame. Increasing the focal length on your camera lens allows you to "zoom in" on your target.įor reference, wide-field astrophotography setups generally stay at or below 70 mm focal length. This functions in the same manner as lenses on a standard DSLR camera. Your telescope's focal length determines the magnification it provides, making it a primary factor in deciding what kind of astro-imaging you want to do and what celestial bodies you can capture. Remember, the focal length is measured internally for your telescope. For example, a focal length of 1000 mm (40 inches) doesn't necessarily mean your telescope is physically that long. The focal length of the telescope is the distance from your first lens to the focus point of your camera. Here, we'll look at some of the most important parts of a telescope when choosing an astrophotography telescope. While some scopes are better suited for planetary views, others perform best with a camera. Let's get started! WHAT IS THE IMPORTANT PART OF A TELESCOPE FOR ASTROPHOTOGRAPHY? We're fortunate enough to be involved in this hobby for over 70 years, so we're excited to pass this knowledge on to you! Technology, apps, "astrophotography mode" on Google's Pixel 4 has made astrophotography more accessible than ever!Īlthough those tools are a welcoming door to astrophotography, it's a hobby with many options. ![]()
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