**How is FOV calculated in astrophotography?** **FOV = ((57.3 / 1040) * 22.3)**

The long side of the frame has a field of view of 1.23 degrees.

**How is FOV telescope calculated?**

**Determine Your True Field of View**

- Divide the focal length of the scope, 1,200mm, by the focal length of the eyepiece, 25mm, to determine that that combination provides 48X magnification.
- Divide the AFoV, 50°, by the magnification, 48X, to yield a TFoV of 50/48, or about 1.0417°.

**How is field of view calculated in CCD?** Take the two and use this formula: **(135.3x D) / L**. This will give you the field of view (in arcminutes) for your telescope and imaging device.

**How is apparent field of view calculated?** With the conventional method used previously, the apparent field of view was calculated by **multiplying the real field of view by the binocular magnification**. (With this formula, apparent field of view wider than 65˚ is called wide field of view.)

## How is FOV calculated in astrophotography? – Additional Questions

### What is field of view example?

It’s **the distance from the lens to the sensor**. So if you’re shooting with an 8 mm lens, that means your sensor is 8 mm away from your lens. A short focal length like this, means a wider field of view.

### What is a good field of view for a telescope eyepiece?

The apparent FOV for each eyepiece ranges from **45o to 68o** and is a result of how the eyepiece is designed. When used in this example with an 8-inch telescope with a focal length of 2032 millimeters, the magnifications range from 41x to 75x.

### How do you calculate the area of the field of view?

If the angle of the field of view is a degrees than you can see a/360 of the circle so the area of the sector you can view is **(a/360) × (π r**^{2}) square units.

### How do you calculate the field diameter of a microscope?

To calculate field of view, you need to know the magnification and field number of the microscope’s lens currently in use. **Divide the field number by the magnification number** to determine the diameter of your microscope’s field of view.

### How do you calculate exit pupil?

To calculate the exit pupil of a binocular, **divide the objective size by the magnification**. For example, a 7X50 binocular delivers an exit pupil of 50/7=7.1mm, while a 10X50 binocular delivers an exit pupil of 50/10=5mm.

### What is a good exit pupil?

The ancient dogma on this topic, printed in countless books, says “The human pupil dilates to a maximum diameter of 7 millimeters.” Therefore **7 mm** is supposed to be the ideal maximum size for the exit pupil of binoculars or a telescope. This is the reasoning behind the popular 7×50 “night glass” binocular.

### What exit pupil is too small?

The 25x/inch (1mm exit pupil) and **50x/inch (0.5mm exit pupil)** “limits” are attempts to provide guidelines on just how close you have to be before you can resolve the Airy disk and thus reach the limiting resolution of the telescope.

### What is scope exit pupil?

The exit pupil is **the bright circle that can be seen in the center of each eyepiece when you hold the binoculars about 30cm away from your eyes with the objective lenses pointed toward a bright light**.

### Why is exit pupil important?

Why is the Exit Pupil Important? It is important because **the only light rays which pass through this virtual aperture can exit the system and enter your eyes**. Therefore with all else being equal, the larger the exit pupil diameter, the more amount of light will be delivered to your eye.

### Is exit pupil the same as eye relief?

**Eye relief is the distance from the outer surface of the eyepiece lens to the position where the exit pupil is formed** (eyepoint). Looking through binoculars from the eyepoint, you can obtain the whole field of view without vignetting.

### How far can you see with 7×50 binoculars?

How far can you see with 7×50 binoculars? Apparently, you can see **beyond 3 million light years** away.

### Are 7×50 binoculars good for astronomy?

**The best all-around binoculars for astronomy are either 7×50 or 10×50**. 7×50 binoculars will give you an exit pupil of 7mm, which is the largest you want to use. 10×50 binoculars have a 5mm exit pupil, which is even better.

### What power binoculars do I need for astronomy?

As a rule of thumb, get stargazing binoculars with **an aperture of 35 mm to 60 mm aperture and a magnification of 7x to 10x**. A pair of 7×35’s is about the minimum acceptable for astronomical observing; 7×50’s are better… this will give you the same magnification but a wider field of view.

### What magnification do you need to see Saturn’s rings?

The rings of Saturn should be visible in even the smallest telescope at **25x**. A good 3-inch scope at 50x can show them as a separate structure detached on all sides from the ball of the planet.

### What can you see with a 200x telescope?

200x – **Your entire FOV covers about half the surface of the moon**. You start seeing smaller features you didn’t know were there, such as small peaks inside craters! 300x and above – You start feeling like you’re flying above the surface of the moon.

### What is the best size telescope for viewing planets?

Telescopes that have **4 or 5 inch diameters** are great for viewing solar system objects like the planets, our Moon, and Jupiter’s moons. Viewing Neptune and Uranus can be difficult with a scope this small but it’s not impossible. A telescope of this size is probably a good starting point for a complete beginner.

### How much magnification do you need to see Jupiter?

To look at planets like Jupiter and Saturn, you will need a magnification of **about 180**; with that you should be able to see the planets and their moons. If you want to look at the planet alone with higher resolution, you will need a magnification of about 380.