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NS50 screen image size issue when changing to scope with AO

Discussion in 'Night Vision Optics and Illumination' started by the dog, Apr 9, 2014.

  1. the dog

    the dog Petrol engines do NOT like diesel

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    Hi all.
    I’ve just mounted a Hawke 3-12x50 AO IR onto my gun to use in conjunction with my NS50 night vision. This replaces my Hawke 3-9x50 (non AO) as I wanted a bit more magnification.
    However, the image on the screen with the new scope is smaller than that of the 3-9. Is this because of the AO focus ring or is it that the tube on the 3-12 scope slightly longer? The focus length of the IR camera to the cross hair is the same but the eye piece on the 3-12 scope is a slightly larger diameter to that of the 3-9.
    If the AO ring is the issue, would a side winder scope eliminate this? Has anyone else experienced this and if so, any recommendations on which scope to use? I might have to revert back to the 3-9x50.
    Cheers in advance
     
  2. terry1001

    terry1001 Major Poster

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    When you say that the image on the screen is smaller do you mean that you can see more black around the scope picture or that objects appear smaller?
    The AO (or side focus) will have no real effect on image size but a different scope may well produce a larger or smaller image at the eyepiece.
    If you are seeing a a scope picture surrrounded by black on all sides you will really need to get a longer focal length lens which will sort this out. I don't know what lens your NS50 will have fitted but I'm sure that they are standard board mount lenses which only cost a couple of pounds on ebay and are very simple to swap over - the lens is locked in place with a small grubscrew, slacken that off then unscrew the old lens and screw in the new one. You will need to focus it by screwing it in/out until you get a clear picture (no need to fit it to the scope for this) and then do up the grubscrew. I would suggest that a 16mm f1.8 lens would suit but check to see what is already on there, it may well be a 12mm. I also understand that these are sent out with the ir filter in place on the camera so if you do change the lens it might be worth while checking for this as removing the filter will give you a fair bit more range.
     
  3. FGYT

    FGYT Engaging Member

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    is it a black ring inside the scope occular circle ie the camera is to close to tthe back of the scope

    same effect you get if your eye is to close
     
  4. the dog

    the dog Petrol engines do NOT like diesel

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    Terry is correct, there is more black area around the image on the screen. Am I correct in assuming this is because the new scope is slightly longer? I didn't have to re-focus the lense on the camera with the new scope, to get a clear recticle.
    I'll try to find out what lens it has fitted and source a suitable replacement. Hope I don't b****r it up! LOL
    Cheers for the info Terry.
     
  5. snapperspike

    snapperspike Engaging Member

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    As standard, the nitesites are fitted with a 12mm lens, and have the ir filter on the camera still.
    Not sure why your getting a smaller picture on the screen.
    I swapped my NS200 over to lots of different scopes, and never really noticed that.
    Try moving the rubber tube in and out over the back of the scope, to see if it males a difference.
     
  6. the dog

    the dog Petrol engines do NOT like diesel

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    Tried moving the camera in and out of the rubber sleeve to no avail.
    I've just done a quick comparison, just looking through the two scopes at the same mag (x3). The 3-12x50 has a significantly smaller field of view than the 3-9x50. At a distance of about 15 feet the difference is about 10 inches on the view (looking at a brick wall I see around 4 'bricks high' less). This surprises me considering they are both 50mm scopes and from the same manufacturer.
     
  7. terry1001

    terry1001 Major Poster

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    Sounds about right to me, I've compared a few and found the same. It's one of the reasons I don't like the idea of using zoom scopes for rangefinding and why I always check by shooting anything relating to zoom such as when you change the magnification and check the aim points with Chairgun.
     
  8. the dog

    the dog Petrol engines do NOT like diesel

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    Terry, could you advise which scopes you found with the larger fields of view? LOL.
    I did want the additional mag but not at the expense of a smaller image on my night vision. I would rather use the 3-9 if necessary.
    Cheers
     
  9. terry1001

    terry1001 Major Poster

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    I'm afraid I can't offer any suggestions for a scope. If you want to increase the central image from the scope the way to achieve that is to increase the focal length of the camera lens. Something like this http://www.ebay.co.uk/itm/CCTV-Box-...-/360677343812?pt=UK_CCTV&hash=item53fa0b8244 should fill the screen with a picture of the scope view. An alternative would be a zoom lens like this http://www.ebay.co.uk/itm/9-22mm-1-...?pt=UK_Sound_Vision_Other&hash=item2ec9f837bc which would allow you to change the zoom until you get yhe picture you want.
    The effect of increasing the focal length of the camera lens is to zoom into the image projected by the scope, if you wish to keep the size of the target on the screen at the same size then as you increase the camera focal length you can reduce the scope zoom - if that makes sense.
    Night vision works better with lower scope magnification as this lets more light through to the add on,as you are watching a picture on your screen you can gain magnification, as I said above, by increasing the focal length of the camera lens. This will make it a bit more tricky to focus the camera on the cross hairs so you will need to have a focussing scope, side focus is easier but AO will do. Like most things you don't get something for nothing, it's about getting a sensible balance between the components which is something you can do as a home buider but isn't practical for manufacturers to do. The NS50 is an entry level product and has to be inferior to the NS200 soo that they can sell both and offer an upgrade option.
     
  10. the dog

    the dog Petrol engines do NOT like diesel

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    Thanks mate. Very useful info.
    I'll probably have a dabble at a self build at some point.
     
  11. snapperspike

    snapperspike Engaging Member

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    Sudden silly thought !
    The scope you took off wasn't a Hawke panorama type was it ?
    I know they have a slightly wider fov than a lot.
    Just a thought.
     
  12. the dog

    the dog Petrol engines do NOT like diesel

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    No mate. It is a HD Sport, although looking at the website the 3-9X50 model does have quite a good FOV. Can't find any info on the FOV for a 3-12x50 AO IR but I bet it is less than my HD Sport.
    Now I know what the issue is, I know what scopes to avoid LOL unless I change the focal length of my NV lens.
    Cheers to all for the advice and thought provoking posts, very helpful.
     
  13. nuts

    nuts Well-Known Member

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    hi try turning scope eyepiece all the way out. then re-focus camera. this will give you best fov. but check poi after.
     

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