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2MiB, 2610x4640, IMG_20180111_152820.jpg

Anonymous Thu 11 Jan 2018 21:31:34 No.3221702 View View Reply Original Report

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So I am doing a new security camera setup at a carwash and know nothing about how I'd get a wider or narrower angle for viewing. (Camera noob) The cameras I've got are pic related (Clearview IPB-82A). Boss man says he doesn't like the angle that wide after seeing them and wants something slightly narrower. This has a 3.6mm fixed lens. Would I search for a higher or lower number for the lens size if I wanted it to be narrower?

Technically Correct !c4MrSq6dfA

Technically Correct !c4MrSq6dfA Thu 11 Jan 2018 21:42:24 No.3221709 Report

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Higher number, BUT, it also depends on the sensor size so focal length alone can be misleading. A higher quality camera with a longer focal length might actually have a wider field of view.

You might have to dig deeper through the specs and see if they actually list the field of view rather than just the lens focal length (or at least give you the 35mm-equivalent focal length, which can be compared to the 35mm-equivalent focal length of other cameras).

Anonymous

View Same Google ImgOps iqdb SauceNAO focal2_0.jpg?itok=-RL1C8QV.jpg, 202KiB, 960x595

Anonymous Thu 11 Jan 2018 22:13:08 No.3221715 Report

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Just checking online, a 1/2.5'' sensor is a 6x crop, making a 1/2.7'' (which your camera uses) have a crop factor of ~6.5x, maybe . So roughly speaking the 3.6mm focal length is roughly 23.5mm in full frame equivalent.

If you want a more narrow view, look at the size of the sensor in the camera you are going to get and use that to find the crop factor (you can probably check online, or calculate it off the other ratios), then multiply the focal length of the lens by the crop factor to get the full frame equivalent, what you are looking for is something higher than 24, maybe 28 at minimum.

You can look online to show comparisons between how wide different focal lengths look so you can determine before hand what kind of field of view you want.

Anonymous

Anonymous Thu 11 Jan 2018 22:18:12 No.3221719 Report

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Okay so there's two things that go into it. I'm sure on their cut sheets I can find the sensor size and from there a chart that tells me the angle based on those two things.

So this 1/2.7 sensor uses a 3.6mm lens giving me 94 degrees viewing angle which is definitely fairly wide. If I wanted a more standard viewing angle that's probably around 70 ish degrees, correct?

Anonymous

View Same Google ImgOps iqdb SauceNAO Angle-of-View-from-BandH.jpg, 706KiB, 945x800

Anonymous Sat 13 Jan 2018 06:20:25 No.3222681 Report

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Convert the focal length to the 35mm equivalent then compare to this chart and the image above to see what kind of focal length you want.

Donnic

Donnic Sat 05 Oct 2019 20:02:02 No.3222681,15 Report Delete

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