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ircut

Discussion in 'Night Vision Optics and Illumination' started by sillygarry, Dec 30, 2013.

  1. sillygarry

    sillygarry Posting Addict

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    hi what is the difference in IR CUT CAMERA to a ir camera
     
  2. neiled

    neiled Donator

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    CUT........... sorry!
     
  3. sillygarry

    sillygarry Posting Addict

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    ha ha ha now go back to sleep:-D
     
  4. r10hunter

    r10hunter Honorary Member

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    A small pinkish square of glass or plastic is placed over the sensor in an ir cut camera to limit its sensitivity to ir. For DIY nv use this filter needs to be removed.
    Cameras that were designed to work in low light levels all the time don't have the filter fitted but these often tend to be more expensive specialist cameras like the watec.

    Depending on the camera there are various ways of removing the filter. Two blades one on each side, soldering iron etc.
    Cheers Andy
     
    Last edited: Dec 30, 2013
  5. terry1001

    terry1001 Major Poster

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    The descriptions from the Chinese sellers are unreliable so you can never be quite sure if they are actually describing the item they're selling.
    There are 2 types of ir filters, ir cut and ir pass. Generally the ir cut ones will be a light tint while the ir pass type appear black. The main use of ir cut filters in cameras is to correct the colour balance and to deal with the issue of ir light and white light focussing at different places which gives a slightly fuzzy appearance to the image in low light.
    As Andy said the ir cut filter needs to be removed to get the best sensitivity for nv use.
    The ir cut filter can be a small square of glass fixed to the front of the sensor (which can usually be removed) or it may be a coating on the lens. If you buy a lens from someone like Stock Optics you will see that they offer lenses for daylight use as well as for different wavelengths of ir. Poor performance can be due to a lens with an anti ir coating as well as the other, more obvious, reasons so be carefull when buying lenses.
     
  6. weebster

    weebster Posting Addict

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    There is also the mechanical ir filter camera,with this type the ir filter glass is contained in a sliding shutter type mechanism and when the light gets low it 'moves' the filter out of the line of the sensor effectively changing the camera from a daylight to night time camera,in daylight the filter is back in place in front of the sensor to correct that 'washed out' colour look.
    Ideal for those that want to film daylight shooting as well as night,how reliable the ir shutter is I couldn't say.
     
  7. sillygarry

    sillygarry Posting Addict

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    hi terry just ordered this from stock optics on ebay 111191826619 will it be ok
     
  8. terry1001

    terry1001 Major Poster

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    A qualified yes as it's rated to 850nm so you won't (probably) be able to use a 940nm ir light (which you're not likely to want to do anyway).
    Weebster is right about the moving ir cut filter, it's the system used on Sony nightshot camcorders and some other cameras which have more sophisticated electronic control systems. As far as I know it's perfectly reliable but not too easy to incorporate into most diy builds.
     

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