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Calculating Field of view in degrees.
I'm wondering how difficult it is to calculate the field of view for my
binoculars and finder scope. The binoculars are a pair of ProOptic 11x70 and an old pair of Jason 10x50 and the finder is an 8x50. I'd like to plug those values into my planetarium program. Thanks in advance. |
#2
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"Ernest A. Martsching" wrote in
: I'm wondering how difficult it is to calculate the field of view for my binoculars and finder scope. The binoculars are a pair of ProOptic 11x70 and an old pair of Jason 10x50 and the finder is an 8x50. I'd like to plug those values into my planetarium program. Thanks in advance. You can't calculate the field of view from the information you have provided. If you knew the AFOV provided by the eyepieces you could calculate the TFOV = AFOV / M. (M = magnification). Of course you could measure the TFOV directly. Most binos specs specity AFOV and/or TFOV. Llanzlan. |
#3
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"Ernest A. Martsching" wrote in
: I'm wondering how difficult it is to calculate the field of view for my binoculars and finder scope. The binoculars are a pair of ProOptic 11x70 and an old pair of Jason 10x50 and the finder is an 8x50. I'd like to plug those values into my planetarium program. Thanks in advance. You can't calculate the field of view from the information you have provided. If you knew the AFOV provided by the eyepieces you could calculate the TFOV = AFOV / M. (M = magnification). Of course you could measure the TFOV directly. Most binos specs specity AFOV and/or TFOV. Llanzlan. |
#4
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"Ernest A. Martsching" wrote in message
... I'm wondering how difficult it is to calculate the field of view for my binoculars and finder scope. The binoculars are a pair of ProOptic 11x70 and an old pair of Jason 10x50 and the finder is an 8x50. I'd like to plug those values into my planetarium program. Thanks in advance. I asked a similar question in sci.astro.amateur recently (more for binos). On binos the field of view in feet/yards is usually indicated between the eyepieces and I asked how to convert to degrees for a similar use as yours: http://tinyurl.com/o7qm hth, -riff |
#5
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"Ernest A. Martsching" wrote in message
... I'm wondering how difficult it is to calculate the field of view for my binoculars and finder scope. The binoculars are a pair of ProOptic 11x70 and an old pair of Jason 10x50 and the finder is an 8x50. I'd like to plug those values into my planetarium program. Thanks in advance. I asked a similar question in sci.astro.amateur recently (more for binos). On binos the field of view in feet/yards is usually indicated between the eyepieces and I asked how to convert to degrees for a similar use as yours: http://tinyurl.com/o7qm hth, -riff |
#6
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Ernest A. Martsching wrote:
I'm wondering how difficult it is to calculate the field of view for my binoculars and finder scope. The binoculars are a pair of ProOptic 11x70 and an old pair of Jason 10x50 and the finder is an 8x50. I'd like to plug those values into my planetarium program. Thanks in advance. Usually, many binoculars are stamped with the field in the form of the number of feet wide the view is at a set distance like 1000 yards. For example, my old 10x50's are 356 feet at 1000 yards (3,000 feet). To a fair approximation, take half with width of the field and divide it by the range figure (3000 feet in the case of many American binos), then take the inverse tangent of that number and multiply it by two. That should give you the field in degrees. My old Traq 10x50's have a field of about 7 degrees (lousy outer field quality), and my new Celestron 10x60's have a field of 5.3 degrees (very sharp). Clear skies to you. -- David W. Knisely Prairie Astronomy Club: http://www.prairieastronomyclub.org Hyde Memorial Observatory: http://www.hydeobservatory.info/ ********************************************** * Attend the 10th Annual NEBRASKA STAR PARTY * * July 27-Aug. 1st, 2003, Merritt Reservoir * * http://www.NebraskaStarParty.org * ********************************************** |
#7
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Ernest A. Martsching wrote:
I'm wondering how difficult it is to calculate the field of view for my binoculars and finder scope. The binoculars are a pair of ProOptic 11x70 and an old pair of Jason 10x50 and the finder is an 8x50. I'd like to plug those values into my planetarium program. Thanks in advance. Usually, many binoculars are stamped with the field in the form of the number of feet wide the view is at a set distance like 1000 yards. For example, my old 10x50's are 356 feet at 1000 yards (3,000 feet). To a fair approximation, take half with width of the field and divide it by the range figure (3000 feet in the case of many American binos), then take the inverse tangent of that number and multiply it by two. That should give you the field in degrees. My old Traq 10x50's have a field of about 7 degrees (lousy outer field quality), and my new Celestron 10x60's have a field of 5.3 degrees (very sharp). Clear skies to you. -- David W. Knisely Prairie Astronomy Club: http://www.prairieastronomyclub.org Hyde Memorial Observatory: http://www.hydeobservatory.info/ ********************************************** * Attend the 10th Annual NEBRASKA STAR PARTY * * July 27-Aug. 1st, 2003, Merritt Reservoir * * http://www.NebraskaStarParty.org * ********************************************** |
#8
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Thank you to all that replied.
Since I'm an English major and not a math, I think I'll go with Llanzlan's methodology since it will give me the actual field of view. "Ernest A. Martsching" wrote in message ... I'm wondering how difficult it is to calculate the field of view for my binoculars and finder scope. The binoculars are a pair of ProOptic 11x70 and an old pair of Jason 10x50 and the finder is an 8x50. I'd like to plug those values into my planetarium program. Thanks in advance. |
#9
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Thank you to all that replied.
Since I'm an English major and not a math, I think I'll go with Llanzlan's methodology since it will give me the actual field of view. "Ernest A. Martsching" wrote in message ... I'm wondering how difficult it is to calculate the field of view for my binoculars and finder scope. The binoculars are a pair of ProOptic 11x70 and an old pair of Jason 10x50 and the finder is an 8x50. I'd like to plug those values into my planetarium program. Thanks in advance. |
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