Field of viewcalculator astrophotography

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Jul 26, 2023 — To calculate a magnification magnitude, divide the distance of the image created by the lens from the distance of the object to the lens.

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Also, some objects require a wide field of view to show the entire object, so we need to choose the eyepiece that will let us 'take it all in'. Herein lies the popularity of wide field eyepieces. At any given magnification, they allow us to see more of the sky. Extended objects like open star clusters, many nebula and some nearby galaxies are only visible in their entirety with a wide-field view.

Calculating the TFOV is not too hard, but there are a few things we need to proceed. First, we need to know the focal length of our telescope and the subject eyepiece. These two are easy as they are generally marked on the side of the scope and eyepiece. But we also need to know the apparent field of view (AFOV) of the eyepiece. This is generally obtainable from the manufacturer of the eyepiece, but it is useful to know that most Plossl eyepieces (the most common type on the market) have an AFOV of 50 degrees.

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To help with all this math, there is a "Scope Calculator" available in the Downloads section of our Club web site. This Excel spreadsheet performs all the tedious work, you just provide information such as the focal lengths of your scope and eyepieces and the apparent field of view of your eyepieces. The result is a table showing the magnification and the approximate true field of view of each eyepiece. Print a copy and place it in your eyepiece case for quick reference.

Telescopesimulator

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The field of view is the circle of sky visible through the eyepiece. Generally speaking, as you exchange eyepieces to get a higher magnification, the field of view is a smaller piece of the sky. We measure FOV in degrees or fractions of a degree. Usually astronomers refer to the actual field visible in the eyepiece as the true field of view or TFOV. Knowing the TFOV of each of our eyepieces is very useful since we can then compare what we see in the eyepiece to printed or computerized star charts to help us identify what we are seeing.

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Tenaquip Limited acquired NIS Northern Industrial Sales in the fall of 2016. As of January 1st, 2021, NIS Northern Industrial Sales will be changing names to Tenaquip Limited.

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This NSI/Leviton 6" (15.25 cm) Theater Fresnel Glass Lens is a replacement for the one which comes standard with the 6" Theater fresnel fixture. Reviews. Write ...

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Let's say the focal length of our scope is 1000mm and the focal length of our Plossl eyepiece (50 degrees AFOV) is 10mm:

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Field of viewcalculator

CS mount to C mount adapter. Find the matching C-mount and CS-mount lenses in the shop. Made in Japan.

After spending just a little time exchanging the eyepieces in a telescope, you will soon find that more than just the magnification varies with each eyepiece. One of the primary differences is the total amount of sky you can see with each eyepiece, also known as the field of view or FOV.

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Polaroid sunglasses are familiar to most of us. They have a special ability to cut the glare of light reflected from water or glass (see Figure 1).