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Baxall OSD Series Manual

Cameras and lenses
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Guide to Cameras and Lenses

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Summary of Contents for Baxall OSD Series

  • Page 1 Guide to Cameras and Lenses...
  • Page 2 PRODUCT SAFETY WARNING • Installation and servicing of cameras is only to be carried out by suitably qualified and experienced personnel. • Mains cameras contain hazardous voltages • Do not remove camera covers as there is a risk of injury or death by electric shock. •...

  • Page 3: Table Of Contents

    Guide to Cameras and Lenses Contents Introduction ................................4 Colour Balance ................................. 5 Gamma ..................................6 Automatic Gain Control (AGC) ..........................6 Electronic Iris (EI) ..............................6 Synchronising Cameras ............................7 Linelock phase adjust (LL-PH) ..........................8 Backlight Compensation (BLC) ..........................8 Flickerless ................................

  • Page 4: Introduction

    DD lens connector Typical Camera Layout Some cameras in the Baxall range (OSD Series), are set up remotely by means of an on-screen menu system. All the functions of these cameras can be changed or set via the video coaxial connection.

  • Page 5: Colour Balance

    The camera cannot do this unless the colour mode is set to auto colour balance. It will only correctly reproduce white for the specific lighting type it is set for. Baxall set the three fixed colour modes on their cameras to compensate for indoor (tungsten), outdoor (daylight) and fluorescent lighting types.

  • Page 6: Gamma

    AUTOMATIC GAIN CONTROL (AGC) Baxall cameras contain a video amplifier which applies gain to the video signal as required (up to a maximum of 28dB). The circuit is designed to compensate for fluctuations in scene illumination which would cause the video output level to be too low.

  • Page 7: Synchronising Cameras

    This is because the video output from each camera is essentially free running and frames arrive at the video switcher at different times. Baxall cameras provide several features to ensure synchronisation.

  • Page 8: Linelock Phase Adjust (Ll-Ph)

    Guide to Cameras and Lenses problem. A side effect of such a setup however may be that the lighting in the scene seems to flicker. This is caused by the discrepancy in the frequency of the camera (50Hz) and the frequency at which the lights are running (60Hz) resulting in a mild strobing effect.

  • Page 9: Flickerless

    Fig. 9 User-selectable BLC windows On most cameras, the exposure window is fixed to the central portion of the scene (figure 8). Some baxall cameras allow you to choose several different windows (X series cameras); and some cameras allow you to completely control the size/position of the window and the amount of exposure compensation applied to the selected area (OSD series cameras).

  • Page 10: Sensitivity

    Guide to Cameras and Lenses SENSITIVITY The sensitivity of a CCD camera, broadly speaking, is a measure of its performance in low light conditions. Baxall quote the sensitivity levels of their cameras as the minimum scene illumination required at a given lens aperture to provide a useable video output.

  • Page 11: Common Lens Terminology

    Guide to Cameras and Lenses Fig. 11 Peak White Inversion off Peak White Inversion on COMMON LENS TERMINOLOGY Aperture - The ‘opening’ of a lens indicating the measure of its light gathering capability or performance. Relative Aperture is a ratio between its focal length and effective aperture and is measured in f numbers e.g. f1.4, f1.3, etc. Generally, the lower the f number, the more light gathering capability the lens has.

  • Page 12: Choosing A Lens

    Guide to Cameras and Lenses CHOOSING A LENS Few things can the impair the performance of a CCTV camera more than an incorrect or poorly chosen lens. Lens choice depends upon several factors such as the physical position of the camera, the available scene illumination and the type of view of the scene that is required.

  • Page 13: Variable Focal Length

    CS-mount. The main dimensional difference in the two systems is the distance that the back (or flange) of the lens protrudes (figure 15). The unique back-focussing mechanism on Baxall cameras allows both types of lens mount to be used—see adjusting the lens back focus. This is because the CCD assembly can be physically moved backwards and forwards in relation to the back of the lens.

  • Page 14: Lens Iris

    These lenses cannot react to changes in scene illumination and are best suited to indoor applications where the ambient light will remain constant. The Electronic Iris and Automatic Gain Control features of Baxall cameras can allow this type of lens to be used in a wider range of application areas.

  • Page 15: Peak / Average Adjustment For Automatic Iris Lenses

    ‘hunting’—a condition where the iris reacts too quickly to changes in the scene illumination. The camera has to be capable of supplying these signals via the correct connector, and is a common feature of all Baxall cameras. A potentiometer on the side of the camera is used to adjust/set the drive level for the lens.

  • Page 16: Dd Lens Level Adjustment For Fixed And Zoom Lenses

    Guide to Cameras and Lenses DD Lens Level Adjustment for Fixed and Zoom Lenses The only correct method of setting the lens level control is to monitor the camera output on an oscilloscope and adjust the level control for a reading of 0.3 volt sync. and 0.7 volt video = 1 volt peak to peak total (figure 19). Fig.

  • Page 17: Adjusting The Lens Back Focus

    ADJUSTING THE LENS BACK FOCUS Baxall cameras contain a mechanism for adjusting the position of the CCD assembly in relation to the back of the lens (figure 21). The back focus adjustment screws are located on the top and side of the case and should be adjusted using an appropriate screwdriver.

  • Page 18: Camera Mounting

    CAMERA MOUNTING All Baxall cameras are fitted with mounting points on the top and bottom of the case (figure 22). They are designed to accept standard photographic mounting bolts (1/4” BSW or 20 UNC). The mounting bracket and its fixing, must be capable of supporting the weight of the camera and its lens.
  • Page 19 Guide to Cameras and Lenses A CCTV system has to be capable of handling signals that can be at a nominal 5MHz and above in frequency. The coaxial cables in common use exhibit resistive characteristics at such frequencies. The effect of this in real life is to attenuate or reduce the video signal slightly.
  • Page 20 Baxall Limited, Stockport, England. Visit our Web site: http://www.baxall.com Baxall Limited reserve the right to make changes to the product and specification of the product without prior notice to the customer. HB-CAMGUIDE-2 Issue 2 03/01...

This manual is also suitable for:

Cdx seriesX series

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