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    How to Calculate angle of view.
    #1
    Senior Member Peter C.'s Avatar
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    I have an outdoor stage performance coming up and they're setting up a platform for me but want it as close to the stage . How do I calculate how far back I need to be to get the entire stage (which is 68 ft wide) in the frame?
    I'm using a Panasonic UX90 1" sensor, the widest angle of its zoom lens is 24.5mm.

    I know I could setup my camera at the location to find this out but it would save me a trip out to the venue and I could give them an answer now.


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    #2
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    Can you measure 68' and test the distance back in a parking lot or park to know for sure?


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    Senior Member ahalpert's Avatar
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    50' away from stage

    It's right triangle trigonometry since you know the field of view of the lens and the width of the stage. So, it's a right triangle where one side is half the width of the stage, the opposing angle is half the degrees of your lens' field of view, and the 2 adjacent angles are 90 degrees and (90 - half your lens field of view)

    But I just went to this guy's website and plugged in the numbers. http://www.bobatkins.com/photography...d_of_view.html

    50' away gives you 73.47' wide frame with a 24.5mm (full-frame equivalent lens)
    www.VideoAbe.com

    "Captain, the most elementary and valuable statement in science, the beginning of wisdom, is 'I do not know.'" - Lt. Cmdr. Data


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    Senior Member Peter C.'s Avatar
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    Thanks I'll do both it's raining today but I'll try a test in my backyard to confirm. When I did a test in my house window frame. I needed to be roughly back the distance of width so 50' sounds right.


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    Using the chart of sensor dimension on this page:
    http://photoseek.com/2013/compare-di...s-1-inch-type/

    and the FOV calculator on this page you should be able to calculate FOV for most sensor and lens combos:
    https://www.scantips.com/lights/fieldofview.html

    Chris Young


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    #6
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    I come up with a different answer using a 2.7 crop factor. To be more precise the usable area of the sensor should be used in calculating that factor, e.g. if in camera stabilization is a feature.


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    #7
    Senior Member Peter C.'s Avatar
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    Quote Originally Posted by cyvideo View Post
    Using the chart of sensor dimension on this page:
    http://photoseek.com/2013/compare-di...s-1-inch-type/

    and the FOV calculator on this page you should be able to calculate FOV for most sensor and lens combos:
    https://www.scantips.com/lights/fieldofview.html

    Chris Young
    I used that same site and couple others to make sure I was using the right numbers. It can be a bit confusing at first understanding the terms.
    If anyone wants to check my math. So the stage is actually 64ft My camera has 9mm lens at it's widest but with a 1" sensor at 2.7 crop x 9mm = 24.3mm (which it has listed on the lens barrel)
    44' distance = 64' width
    48' distance = 68' width
    50' distance = 71' width

    So I suggested 50' distance to give me 7ft margin of error


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    #8
    Senior Member David W. Jones's Avatar
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    I keep an app on my phone called pCAM which has a number of relevant shooting tools, including field of view.
    It has come in handy a number of times.


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