Not quite sure I follow what the problem is here... that the camera won't see the top of the wall when zoomed in too far?
Could you maybe post some stills or even a video clip from the camera to illustrate the problem?
yes camera cant see the top of wall (wall height 1.5M) camera see ground after 5x or 6x zoom so i want to know what is exactly prefect height for not see grounf after 22x zoom
It sounds like maybe your camera doesn't have a full 90degrees (or 180 degrees, depending how you look at it) of tilt.
Actually, in looking at the specs, that is exactly the problem, it only tilts from 10° - 170°.
Using some basic trig, you want to see the top of the wall, where the camera is going to need to be mounted above the wall so that its 10 degree look-down angle doesn't force you to look at the ground.
You need to be roughly 1.5M (the height of the wall) plus .176 meters high for every 1 meter of distance between the camera and the wall.
EG: If you mount the camera 50M from the wall you would mount the camera 1.5+(50*.176) meters high, or 10.3meters high.
I used the triangle calculator on this page as a reference: http://www.cleavebooks.co.uk/scol/calrtri.htm Put in 10 for Angle A, and your distance for edge b, and hit calculate. Take the result it gives you for edge a and add 1.5 meters.
I did a quick sketch up showing what your problem is - as "A" notes, the camera itself doesn't tilt all the way up to 90 degrees from vertical; most PTZs of this type (at least, most of the ones I've dealt with) will only go up far enough to you get a bit of the housing in the top of the frame when zoomed all the way out, which in your case means it stops at about 80 degrees from vertical.
So as A says, to see over the wall, the camera needs to be somewhat higher than the wall. Keep in mind that you still won't see very much over the wall - the higher you go with the camera, the less the wall will block your view.
we install camera to cover wall we install ot in middle of wall to see 200M right and lefy the camera pan V.good but if i make zoom after 5x lens only show ground and as Matt said it is tilt probelm i install camera over mast it is height 4M so i just wonder what will be excatly the height i need to make 22x zoom without show ground only
Rukmini check below answers for your questions
2. i need to see 2M from the ground
4. yes it is possible but i need to calculate it to make the right hieght for the Mst