Darkhorizon472 Posted July 1, 2007 Posted July 1, 2007 Hi, I am very new to all this and was wondering if there are any guides to the technical specs of camera's to help me make the best choice ? I need to cover the front garden + drive and the rear garden. Both are about 10m long and about as wide. I will put the cameras high up and probably under the eaves of the house. Power and cable routing looks easy enough and the cable run will not be that long. So far I understand (unless I am wrong !!) Sony super had 1/3 CCD - is a reasonable image sensor for cheaper camera's. CMOS is not as good. 480TVL - Is a measure of image quality / resolution and 480tvl CCD is a good starting point. A 380TVL CMOS camera would give poor quality images in comparison. Lens - The higher the mm the closer it zooms in at the cost of how wide the field of view is. IP rating : I understand this as well for weather / waterproofing. Below is the specs of a camera I was looking at getting could you advise if this would be any good or not and why ? Thanks for your help. Image sensor : Sony super had 1/3 CCD Resolution : 480 TV line Color System : PAL/NTSC Illumination : 1.0 Lux (F1.4) 0 Lux (with IR lED on) Total Pixels : 440,000 Effective night-vision range : Up to 100ft with 16mm lens Lens : 8mm Scanning system : 2:1 Interlace IR LEDs : 30pcs Big LED S/N Ratio: > 50dB Electronic shutter : 1/50 - 1/100,000 sec White balance : Auto Back Light compensation : Auto Gain control : Auto Video out 1.0V p-p 75Ω (BNC connector (male)) Power requirement DC12V +10%, 800mA (LEDs on) Dimension 4ft (W) X 3.9ft (H) X 7.2ft (L)
Driller Posted July 1, 2007 Posted July 1, 2007 Hi there DH. I'm new at this too, but after doing a lot of reasearch I would go for a variable objective (eg 3mm-8.5mm) if you can afford the bit extra. That way you get that much more flexibility when you have to setup and configure the thing. I agree that the 1/3" sony ccd is ok and that 480 lines or above is the way t go. With my cameras I'm looking at the 520 to 580 range but that could be overkill. Important thing is to match all your gear eg if your cameras can do 480TVL then so should your monitor. Driller
Darkhorizon472 Posted July 1, 2007 Author Posted July 1, 2007 Hi there DH. I'm new at this too, but after doing a lot of reasearch I would go for a variable objective (eg 3mm-8.5mm) if you can afford the bit extra. That way you get that much more flexibility when you have to setup and configure the thing. I agree that the 1/3" sony ccd is ok and that 480 lines or above is the way t go. With my cameras I'm looking at the 520 to 580 range but that could be overkill. Important thing is to match all your gear eg if your cameras can do 480TVL then so should your monitor. Driller Hi, I am finding you have to know quite alot before your can start setting this kind of thing up !! I was looking at the 520 / 580 camera's but am trying to save money without buying something that is not up to the job. The advice about the lens is very usefull and I will have a look again. Thanks
Doktor Jon Posted July 1, 2007 Posted July 1, 2007 Without wishing to overstate the obvious, you need to define the objectives for the cameras, before you start to consider the technical specifications. As a simple example, if you were intending to produce evidential quality images of any intruders, then placing the camera high up under the eaves is almost certainly not the way to go
Darkhorizon472 Posted July 2, 2007 Author Posted July 2, 2007 Without wishing to overstate the obvious, you need to define the objectives for the cameras, before you start to consider the technical specifications.As a simple example, if you were intending to produce evidential quality images of any intruders, then placing the camera high up under the eaves is almost certainly not the way to go Thanks thats usefull advice. I was looking at camera positions that don't stand out a mile but also do the job I need.
Guest anguscanplay Posted July 2, 2007 Posted July 2, 2007 Thanks thats usefull advice. I was looking at camera positions that don't stand out a mile but also do the job I need. cool, as the good Dr points out decide what you want the cams to achieve - do you want to see that the kids are playing nicely or do you want to identify to a court standard the person stood at the door? there really is a huge diference in the standard required and one will negate the other angus
Darkhorizon472 Posted July 2, 2007 Author Posted July 2, 2007 cool, as the good Dr points out decide what you want the cams to achieve - do you want to see that the kids are playing nicely or do you want to identify to a court standard the person stood at the door?there really is a huge diference in the standard required and one will negate the other angus It would be nearer the court standard rather than just being able to see what people are up to. I was looking intially at 3 camera's. One to cover the front door area including the drive with 2 cars on (6m X 6m ). Another to cover the back gate and passage down the side of the house (1m X about 10m) and one to cover the back garden 10m X 10m). The back garden camera does not need to be up to the same standard as the other 2 as it is very difficult to enter the back garden due to an 8ft+ unpassable boundry ( unless you bring a large chainsaw and wrecking ball !) and would probably be used a more general camera setup. The main focus would be on the camera covering the drive / front of house area to a good standard. Thanks for your replies and questions I am learning alot from them, any more advice is very welcome.
Guest anguscanplay Posted July 2, 2007 Posted July 2, 2007 It would be nearer the court standard rather than just being able to see what people are up to. I was looking intially at 3 camera's. One to cover the front door area including the drive with 2 cars on (6m X 6m ). Another to cover the back gate and passage down the side of the house (1m X about 10m) and one to cover the back garden 10m X 10m). The back garden camera does not need to be up to the same standard as the other 2 as it is very difficult to enter the back garden due to an 8ft+ unpassable boundry ( unless you bring a large chainsaw and wrecking ball !) and would probably be used a more general camera setup. The main focus would be on the camera covering the drive / front of house area to a good standard.Thanks for your replies and questions I am learning alot from them, any more advice is very welcome. its posted on the forum else where but to identify a stranger they need to cover 120% of the screen ( ie knees to head ) now with a 3.6mm lens they will only be in focus at that size for a depth of about 18 inches at a distance of about 1.6 meters , so a camera next to a door will be good but a camera up in the eaves wouldnt its often the case i find that although you say three cameras i would specify double at least to get close to the results you want angus
Darkhorizon472 Posted July 4, 2007 Author Posted July 4, 2007 its posted on the forum else where but to identify a stranger they need to cover 120% of the screen ( ie knees to head ) now with a 3.6mm lens they will only be in focus at that size for a depth of about 18 inches at a distance of about 1.6 meters , so a camera next to a door will be good but a camera up in the eaves wouldnt its often the case i find that although you say three cameras i would specify double at least to get close to the results you want angus Thanks that was the kind of info I was after. Do you know of any web links that show you how to calculate which lens you need to get the required results.
Driller Posted July 4, 2007 Posted July 4, 2007 Thanks that was the kind of info I was after. Do you know of any web links that show you how to calculate which lens you need to get the required results. Hey DH. Put "field of view calculator" into google. SHould find what you need.
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