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Lens Chart

Lens Chart



What is a fixed lens and when should I use one?

Fixed lenses usually cover wide angle views regardless of the distance to the subject. If you have a camera in the corner of the room or if you are monitoring a broad and wide area such as outside a home, business, or a parking lot, and you want to pickup as much of scene (field of view) as possible, you would select a wide angle 2.8mm or 3.6mm lens. Most fixed lenses come in a standard wide angle 3.6mm lens. This is a common and cost effective way to monitor an entire room or a broad area outside. If you are covering a wide area, room, or angle then a standared fixed lens (3.6mm) will be perfect and more cost effective.

What is varifocal lens and when should I use one?

A varifocal lens is kind of zoom lens where you have a range of focal lengths you can take. For example 3-8mm lens will allow you to adjust for the field of view you like (within that specified range). In essence, you have may lenses to choose from to get the perfect angle. Varifocal lenses cost more because you have the ability to self adjust the lens. If your camera is in the lobby and you want to watch the door or a cash register, you would use something like an adjustable varifocal lens. The higher the number, the smaller the field of view and there is a bigger zoom effect (objects become closer). So if you think you may want to "get closer" to an object, you may want to choose a varifocal lens to adjust so you can determine the exact angle and ideal width for your application.




CCTVSecurityPros Lens Comparison Chart
Lens Size
Viewing Angle
Distance to Object / Size of Picture (Width x Height)
 

Horiz.°

Vert.°

Diag.°

5 ft.
10 ft.
15 ft.
25 ft.
50 ft.
100 ft.
2.8mm

109°

82°

136°

14´

10.5´

28.0´

21.0´

42.0´

31.5´

70.0´

52.5´

140´

105´

280´

210´

3.6mm

74°

56°

92°

7.5´

5.7´

15.0´

11.4´

22.5´

17.1´

37.5´

28.5´

75´

57´

150´

114´

4.0mm

67°

50°

83°

6.6´

5.0´

13.2´

10.0´

19.8´

15.0´

33.0´

25.5´

66´

50´

146´

110´

6.0mm

42°

32°

53°

3.8´

2.9´

7.6´

5.8´

11.4´

8.7´

19.0´

14.5´

38´

29´

76´

58´

8.0mm

32°

24°

40°

2.9´

2.2´

5.8´

4.4´

8.7´

6.6´

14.5´

11.0´

29´

22´

58´

44´

12mm

22°

16°

28°

1.9´

1.5´

3.8´

2.8´

5.7´

4.5´

9.5´

4.5´

19´

15´

38´

28´

16mm

16°

12°

21°

1.4´

1.1´

2.8´

2.2´

4.2´

3.3´

7.0´

5.5´

14´

11´

28´

22´

25mm

11°

8.4°

14°

1.0´

0.7´

2.0´

1.4´

3.0´

2.1´

5.0´

3.5´

10.0´

7.0´

20.0´

14.0´

50mm

5.5°

4.2°

0.4´

0.3´

0.8´

0.6´

1.2´

0.9´

2.0´

1.5´

4.0´

3.0´

8.0´

6.0´

75mm

3.6°

2.8°

4.6°

0.3´

0.2´

0.6´

0.4´

0.9´

0.7´

1.6´

1.2´

CCTV Security Pros (888) 653-2288

www.CCTVSecurityPros.com
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    - Written on August 16, 2016
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  • This is my second time using them. They are very professional, they offer a quality product, and their tech support is first class!!! I'm a residential contractor and I don't have time for less than high quality products and support.

    - Written on August 20, 2016
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    - Written on August 20, 2016
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  • Just installed my system the day it arrived, it was so easy, didn't even need to ask my grandson for help. JC, Newport Beach, CA

    - Written on July 17, 2016
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  • Second time shopping with them and both times it was a pleasure, good products, great service and excellent value for the price. Will recommend to anyone who needs CCTV gear.

    - Written on June 27, 2016
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  • Spoke to salesman Tim at 812. Needed to get a recorded event to the police. He showed me a way of using my DVR and software that saved my company a lot of money, again. So thankful... not to mention the piece of mind.

    - Written on June 10, 2016
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  • We have placed several order through CCTV and all of them have gone through seamlessly. I would recommend them to anyone.

    - Written on April 20, 2016
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  • Have received orders super quickly, in one to two days. When I called tech support, they got right back to me and had the answers I needed . Will do business with them again. I plan to buy 4 more DVRs and power supplies, and it will definitely be from them.

    - Written on May 28, 2016
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  • I spoke with a representative of CCTV Security Pros before making my purchase. His professionalism was the reason I made my purchase from them.

    - Written on March 17, 2016
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    - Written on May 5, 2016
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    - Written on November 5, 2016
    Star Rating for Our CCTV
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    - Written on November 14, 2016
    Star Rating for Our CCTV
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    - October 29,2016
    Star Rating for Our CCTV
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    - Written on October 29, 2016
    Star Rating for Our CCTV
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  • They were helpful and the shipping was very fast. Over all A+

    - Written on September 27, 2016
    Star Rating for Our CCTV
    Star Rating from Google Trusted Store

  • only brief conversation with sales rep but he was very knowledgeable and helpful,,,,product arrived timely and just now hooking it up. Product appears very well as represented

    - August 28, 2016
    Star Rating for Our CCTV
    Star Rating from Google Trusted Store

  • only brief conversation with sales rep but he was very knowledgeable and helpful,,,,product arrived timely and just now hooking it up. Product appears very well as represented

    - August 28, 2016
    Star Rating for Our CCTV
    Star Rating from Google Trusted Store