Optronis CoaXPress CamPerform Cyclone Series, Руководство пользователя

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2.3 About Lenses
2.3.1 Lens handling
Please be careful when installing or removing camera lens. Depending on your lens mount type and lens, pay
attention to following points:
•
If your lens has a mounting mark, first align lens-holder and lens mounting marks and then rotate anti-
clockwise to lock the lens. To remove the lens, unlock the lens-holder silver clip and rotate clockwise
until marks are aligned. Then remove the lens.
•
If your lens has a screw thread, rotate anti-clockwise to remove it and clockwise to installing it.
•
If you are removing the lens from the camera, always use a cap on the camera to avoid dust infiltration.
Use also caps on both lens sides for the same reason.
•
Do not forget to remove the cap of your lens before using the camera.
2.3.2 Lens Selection / Optical Considerations
A typical optical system can be represented as below.
Figure 4: Field of View
Using above notations:
The sensor size depends on frame dimension:
𝑺𝒆𝒏𝒔𝒐𝒓 𝑫𝒊𝒂𝒈𝒐𝒏𝒂𝒍 𝑺𝒊𝒛𝒆 = 𝑺 = 𝑷𝒊𝒙𝒆𝒍𝑺𝒊𝒛𝒆 × √𝑹𝒆𝒔𝒐𝒍𝒖𝒕𝒊𝒐𝒏_𝑿 𝟐 + 𝑹𝒆𝒔𝒐𝒍𝒖𝒕𝒊𝒐𝒏_𝒀 𝟐
To select a lens, you can use the following formula:
𝑭𝒐𝒄𝒂𝒍 𝑳𝒆𝒏𝒈𝒕𝒉 = 𝑭𝑳 =
𝑾𝑫
𝟏+
𝑭𝒐𝑾
𝑺
(distances in millimeters)
Alternatively, if you already have a lens, you can compute working distance using the following formula:
𝑾𝒐𝒓𝒌𝒊𝒏𝒈 𝑫𝒊𝒔𝒕𝒂𝒏𝒄𝒆 = 𝑾𝑫 = 𝑭𝑳 × (𝟏 +
𝑭𝒐𝑾
𝑺
)
(distances in millimeters)
Examples:
•
PixelSize = 0.008mm
•
Full resolution 1696 x 1708
•
FoW = Object size = 100 mm
•
WD = 300 mm
𝑆 = 0,008 × √1696 2 + 1708 2 = 19,26 𝑚𝑚