Chapter 5 NetCam Lenses

The Focus Ring

NetCam ships with a pre-focused lens. Most lenses available for NetCam also have a focus ring which allows you to focus the lens for a closer subject. The focus ring may be marked in meters:

0.2m -- 0.3 -- 0.4 -- 0.5 -- 1.0 -- oo

The oo stands for infinity. When NetCam leaves the factory, the infin- ity setting is back-focused for infinity. Turning the focus ring to 0.5 meters will yield a focus of half a meter. Turning it back to the infinity symbol will yield an infinite focus again.

Some lenses will not have the numerical markings -- they may be marked only with “near” and “far”. The “far” setting is infinity and the “near” setting is the closest the lens will be able to focus, which varies from lens to lens.

The Iris Ring

Most lenses available for NetCam come with a manually adjustable iris ring. In indoor lighting situations, you will usually want the iris open to its fullest position. In outdoor lighting, you will almost always want the iris set to its smallest position (ƒ16 or smaller, pinhole-sized). The iris ring is usually marked in ƒ-stops:

1.3 -- 4 -- 8 -- 16 -- C

The C stands for closed. In this example, the 16 setting is the smallest marked iris opening and 1.3 is the largest. You can set the iris to settings in between the marked numbers (setting it between 16 and C would result in a setting closer to ƒ22, which is even smaller than ƒ16).

Some lenses do not contain numerical iris markings, but will be marked with “open” and “close”. You will need to look in the lens to see the size of the iris when placing NetCam outdoors. Adjust the iris ring until the iris opening or aperture is the roughly size of a pinhole. We strongly recommend you tune the iris by following the instructions in section 4.1.

Changing Lenses

Change lenses usually requires a back focus adjustment of the new lens. Back focus is the adjustment of the chrome ring that the lens is screwed into. Follow these steps when replacing a lens.

1.Unscrew the original lens from the chrome back ring and com- pletely remove it.

2.Determine if your lens is C-Mount or CS-Mount. If you ordered

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NetCam

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StarDot Technologies net camera manual NetCam Lenses, Focus Ring, Iris Ring, Changing Lenses
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net camera specifications

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