Rohini, New Delhi 4423/9,,Landmark NR NDPL ZONES520,,Jai Mata Market Tri Nagar-110035 D-395, Ground Floor, Pocket D- 6,110085,Delhi, Rohini, New Delhi - 110035, Dist. New Delhi, Delhi

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Bharauli, Noida, Dist. Gautam Buddha Nagar 2nd Floor, C-223, Sector 10, Bharauli, Noida - 201301, Dist. Gautam Buddha Nagar, Uttar Pradesh

Chandpole Bazar, Jaipur House Number 2516, Govind Rav Ji Ka Rasta, 4th Crossing, Chand Pole Bazar, Chandpole Bazar, Jaipur - 302001, Dist. Jaipur, Rajasthan

Dwarka, New Delhi Pole No. 31, Choudhary Mohalla, Dhulsiras, South West, Dwarka, New Delhi - 110061, Dist. New Delhi, Delhi

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Near ICICI Bank, Lucknow 102/37, Hewett Road, Bhanumati Chauraha, Near ICICI Bank, Lucknow - 226019, Dist. Lucknow, Uttar Pradesh

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.

Chickpet, Bengaluru 10, 3rd Cross, Huriopet, Lakshman Rao Road Cross, B. V. K. Lyengar Road Cross, Chickpet, Bengaluru - 560053, Dist. Bengaluru, Karnataka

Pahar Ganj, New Delhi 2205-A, G/F,Chuna Mandi,Pahar Ganj, Pahar Ganj, New Delhi - 110055, Dist. New Delhi, Delhi

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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Jharapada, Bhubaneswar, Dist. Khordha Roshan Homes, Flat No. A0, Jharpad, Jharapada, Bhubaneswar - 751006, Dist. Khordha, Odisha

Wakad, Pune SR No-228,Oppo Jaymalhar Nagar,Bhumkar Chowk,Kaspate Wasti,Wakad, Wakad, Pune - 411057, Dist. Pune, Maharashtra

Kirari Suleman Nagar, New Delhi H.No.D-37A, Ground Floor, KH No.1297, Prem Nagar 1, Kirari,, Kirari Suleman Nagar, New Delhi - 110086, Dist. New Delhi, Delhi

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Grant Road, Mumbai 1st Floor, Kamala Niwas, Proctor Road Grant Road East, Grant Road, Mumbai - 400007, Dist. Mumbai, Maharashtra

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Grant Road, Mumbai Floor-2, Office No.3, Plot-35, Kartar Mansion, Tribhuvan Road, Grant Road, Mumbai - 400004, Dist. Mumbai, Maharashtra

Civil Lines, Gurugram 205, Radha Palace, Gurudwara Road, Civil Lines, Gurugram - 122001, Dist. Gurugram, Haryana

Hoodi, Bengaluru B-205, PRIME BLUE FOREST APPARTMENT, HOODI GARDEN MAIN ROAD,RAJAPALYA, BANGALORE, Hoodi, Bengaluru - 560048, Dist. Bengaluru, Karnataka

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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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Grant Road, Mumbai Plot No 382, 2nd Floor, Swastik House, Dadasaheb Bhadkamkar Marg, Grant Road, Grant Road, Mumbai - 400007, Dist. Mumbai, Maharashtra

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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.

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Gurgaon, Dist. Gurugram 12-15, Apna Enclave Shopping Complex, Railway Road, Gurgaon - 122001, Dist. Gurugram, Haryana

Dwarkapuri Indore, Indore 462,,DWARKAPURI,INDORE 462,Dwarkapuri Indore,452006,Indore, Dwarkapuri Indore, Indore - 452009, Dist. Indore, Madhya Pradesh

Mori Gate, New Delhi No. 2085/27, GF, Bajrang Bazar, Bhagirath Palace, Mori Gate, New Delhi - 110006, Dist. New Delhi, Delhi

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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CPV Block, Bengaluru No. 47, 5th Main, 5th Cross, CPV Block, Ganganagar Extension, RT Nagar RT Nagar, CPV Block, Bengaluru - 560032, Dist. Bengaluru, Karnataka

Villivakkam, Chennai Old No. 11/2 New No. 25, Baliamman Koil Lane Villivakkam, Villivakkam, Chennai - 600049, Dist. Chennai, Tamil Nadu

Fruit Garden, Faridabad Barrak No 21, Second Floor, NH-5, Fruit Garden, Faridabad - 121001, Dist. Faridabad, Haryana

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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Rana Pratap Bagh, New Delhi III, B-4A/28, Rana Pratap Bagh Road, Near Gurudwara, Rana Pratap Bagh, New Delhi - 110007, Dist. New Delhi, Delhi