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650tvl specification and difference

What is 650tvl cctv cameras ? will a 650 and 750 tvl is much difference ? which high resolution cctv system would you recommend for 8 cameras (expandable to 16)

Thanx for any help or explanation
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Going off just the tvl numbers alone is pretty meaningless.  If everything else was identical 750 if better though you probably could not tell the difference between 650 and 750.  In general anything above about 500 is decent.  There are other specs and features that matter much more than a small difference in tvl.  Things like light sensitivity,  dynamic range, auto iris,  day night capability.  

tvl - tv lines and is sort of like the horizontal resolution of the picture.  The vertical resolution is fixed for standard video signals - usually 525 lines on a NTSC camera which is typical in North America.  So its is sort of like the difference between a 650x525 picture or a 750x525 picture.  It's not the same as pixels but I think you probably get the idea.

In this day and age calling this 'high resolution' needs to be put in perspective with multi megapixel IP security cameras which offer much higher resolutions.

Typically the best you get with analog camera's on a DVR is D1 resolution - 704x480.  Does not stack up well vs 1920x1080 HD or higher. I wouldn't recommend getting any DVR that cannot handle D1 at at least 7 or so frames per second on all channels.
crescueAuthor Commented:
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