Why?īecause the Earth rotates and without taking that into account, your pictures will be blurry or have lines on them because your telescope is staying in the same place but not staying focused on the same thing. This may seem a bit strange, but a mount is one of the most important things to consider in astrophotography. 44 kg)-that is quite a difference! MOUNT: One of the telescopes we talk about here is 7 pounds (3.18 kg) and another is 97 pounds (ca. These questions are important to consider since it can affect what telescope is best for your astrophotography needs. Will you be taking it with you places or do you prefer to just take photos in your backyard? When considering which telescope to buy for your astrophotography purposes, it is important to consider where you will be using it. If you are unsure of what you want to take pictures of, staying in the safe zone of f/6 or f/8 telescopes might be a good idea. Furthermore, an f/4 telescope, a fast one, will provide a wider field of view, which is good for deep sky observation an f/10 telescope is slow, provides a narrow field of view and is more useful for planetary use when you want to zoom in on a specific object. The smaller the f-number, the faster the scope. There are advantages to both having a high and a low f-number, but both also come with disadvantages. This is the ratio of the system’s focal length to the diameter of the lens. FOCAL RATIO:įocal ratio is most often given in form of an f-number, and we differentiate between fast scopes and slow scopes. If this sounds complex, here is the simpler version.įocal length is the distance that we measure between two points: point A is from the objective and point B is where that light reaches focus.įocal length is important for astrophotography because it impacts the focal ratio.įinally, longer focal lengths result in somewhat dimmer pictures, though the difference is not always very noticeable. The focal length of a telescope is a measure of how strongly the system converges or diverges light. Generally, you want as much aperture as possible and it is hard to imagine a scenario where you would prefer having less aperture than more.
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