What are the best security cameras systems? And why do most security cameras shoot poor quality pictures?

i agree with all the answers. lots of brands are available, the proper assessment of the facility & the quality of equipment are the key, so you need to look for the best for your needs or in this case what your company`s needs.

first ask several vendors to visit and evaluate the facility and provide you thier assessment & suggested plan of scale, type & functions of CCTV system, ask a third party to provide you with an assessment of the same, and use the one matches the third party assessment or the closest.

using the third party assessment will assure you the actual need and requirements, what matches them will be the best choice, then you choose the best quality or brand of equipement; which i believe is Bosch as Mr. Shaun mentioned.

The best camera system is the digital camera specially if that camera cover all the sensitive and the hot points in the area that need to be secured . 

I would agree with Mr. Shaun's answer ...Thank You

i fully agree with the answers been added by experts..........thanks.

Being for security cameras for corporate security I recommend Bosch. Why these cameras can also be linked in for internal being inside commercial buildings and external for access areas entry and exit and vunerable points outside. Also with this system you can add on other security systems access control read access; alarm monitoring etc. And the quality is good as you are paying for a good brand. You can look up Bosch CCTV Surveilance and hardware through research. Hope this helps.

Better surveillance cameras of the type BOX is a surveillance cameras on a rectangular shape

And cameras are made of reinforced plastic or metal

And most types characterized by surveillance cameras following BOX

- Cameras bear weather factors such as rainfall, temperature, sunlight

Therefore, this type of cameras are often used Outdoor ie it is installing surveillance cameras outside the buildings in BOX

- Cameras bear shocks

- Cameras can be used in the difficult atmosphere

- Mostly it is fitted with a night vision lens

wait more details from expert on this filed