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Gopro side shot focus.

Forums Cameras, Videos, & Recording Equipment Gopro side shot focus.

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    PigeonMan
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    United States
    Accuracy: 1

    Hey guys. I have a gopro hero 7 black with the side shot. When I focus the lens on the camera to get a clear picture of the crosshair, the image becomes blurry. If I focus the image to be clear, then the crosshair become out of focus. My scope has a side focus wheel from 10 to infinite, but doesn't matter what its set to, I'm still getting this problem. If I'm just lookin through the scope with my eyes, both image and crosshair is clear. Its only the gopro sideshot that is having problems to focus both image and crosshair.  How do I fix this?

    • This topic was modified 1 month ago by a Moderator.
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    BackStop
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    United States
    Accuracy: 2

    I have zero experience with any video setup capable of "through the scope" video, but it sounds like your parallax/reticle focus is off or there is a difference in the distance of the focal plane to the camera compared to the distance of the focal plane while looking directly through the scope.

    Reticle focus/parallax is hard to get right because the human eye is quick to adjust and will focus in on it, even when it is not actually focused.  In most cases, slight variations are insignificant.  However, I think when trying to use cameras this way, the parallax/reticle focus can show how far off our eyes actually can be.

    In other words, it sounds like the focal plane of the reticle is not correct compared with the focus of the target or the distance of the camera from the focal plane is different than it is to your eye when you look through the scope.  The only fix I know is to adjust the ocular (eyepiece) lens or adjust the distance of the camera from the focal plane and since I don't know if you can change the distance of the camera from the focal plane, the ocular adjustment is all that is left.

    Good luck and I will follow this thread to see what works.  I may get something to video through the scope… one day.

    • This reply was modified 1 month ago by BackStop.
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    idaho_varminter
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    I haven’t set up my scope cam yet, but I do come from a long photographic background, so I hope I can help. Does your GoPro allow you to adjust your aperture?  The smaller the aperture number, the more light it lets in, but the smaller area of depth of field is in focus. In camera terms, f16 is great for focus throughout your field of view, but it’s like the pupil of your eye being smaller, so you have to compensate by a longer shutter speed. The same physics apply to digital cameras and sensors. To increase your depth of field you must have a smaller aperture, or larger f-stop number. It makes no sense, I know, but that’s how it works. 

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    PigeonMan
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    United States
    Accuracy: 1

    idaho_varminter

    I haven’t set up my scope cam yet, but I do come from a long photographic background, so I hope I can help. Does your GoPro allow you to adjust your aperture?  The smaller the aperture number, the more light it lets in, but the smaller area of depth of field is in focus. In camera terms, f16 is great for focus throughout your field of view, but it’s like the pupil of your eye being smaller, so you have to compensate by a longer shutter speed. The same physics apply to digital cameras and sensors. To increase your depth of field you must have a smaller aperture, or larger f-stop number. It makes no sense, I know, but that’s how it works. 

    Its a gopro hero 7 black with eagle vision lens. The lens is fixed lens. All you can do is rotate the lens to focus the camera. Its  12mm 1.8f lens made by eagle vision. The camera is pointed at a mirror inside the sideshot mount. So it doesnt record through the scope. It actually records at a mirror reflect what the scope sees. Maybe its hard for the camera to focus at a mirror? Not sure.

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    idaho_varminter
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    United States
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    Pigeonman,

    That makes sense.  I’m trying to wrap my head around this, before I go down this road myself. Is your scope first or second focal plane?

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    PigeonMan
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    United States
    Accuracy: 1

    idaho_varminter

    Pigeonman,

    That makes sense.  I’m trying to wrap my head around this, before I go down this road myself. Is your scope first or second focal plane?

    Scope is mtc viper pro. Its a sfp scope.

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    Hajimoto
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    United States
    Accuracy: 5

    Set the scope up to be perfectly clear to the human eye at whatever yardage you're using and then adjust the camera focus and settings to duplicate your eye. In some cases, the settings that auto-adjust/compensate can muddy up the waters.

     

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    BackStop
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    United States
    Accuracy: 2

    I forgot about auto-focus, etc.  Yeah, that can throw things off over and over again.  Probably better set to manual if possible.  But that still leads me to believe that the reticle still is not truly on the same focal plane (focused) when the objective is focused.  In other words, parallax is not set correctly.

    It is really easy to have this happen but the human eye compensates for it.  The camera does not.

    • This reply was modified 1 month ago by BackStop.
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