EV3000 and SkyCam Day/Night Lenses
EMCCD
Hi resolution Color
Camera Motorized Lenses 10-300mm 10-400mm 10-500/20-1000mm
10-550/20-1100mm 12-660/30-1680mm
12.5-750mm/25-1500mm
30-750mm
15-825mm 1000/2000mm
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LENS
COMPARISON ON CAMERAS
12.5mm
lens on a 1" Camera
Same
lens on a 1/2" Camera
Same
lens on a 1/3" Camera
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Images
Sizes
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1" Camera Image Size
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1/3" Camera Image Size
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2/3" Camera Image Size
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1/2" Camera Image Size |
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HOW
TO "TRADE DOWN" LENSES
| Lens
Format |
Camera Format
|
Multiply Lens Focal Length by
|
| 1" |
2/3" |
1.45 |
| 1" |
1/2" |
2.0 |
| 1" |
1/3" |
2.91 |
| 2/3" |
1/2" |
1.37 |
| 2/3" |
1/3" |
2.0 |
| 1/2" |
1/3" |
1.45 |
Example
1
1" format 12.5mm lens on a 1/2" format camera.
12.5mm X 2.0 - 25mm
The picture shown on the monitor using the above example will be the
equivalent field of view of a 25mm lens on a 1" camera
Example
2
2/3" format 7.5mm lens on a 1/2" format camera.
7.5mm X 1.37 = 10.275mm
The picture shown on the monitor using the above example will be the
equivalent field of view of a 10.275 mm lens on a 2/3" camera.
Example
3
1/2" format 3.5mm lens on a 1/3" format camera.
3.5 mm X 1.45 = 5.08mm
The picture shown on the monitor using the above example will be the
equivalent field of view of a 5.08mm lens on a 1/2" camera.
Note: You can always trade down lenses to smaller format cameras, not
up. Trading up a smaller format lens to a larger format camera will
result in a porthole effect in the picture. |
|
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Lens
Glossary
ABERRATION: Factors
in an optical system that generate adverse effect on the resultative
image. Any design work in making optics entails many different
approaches to correct various aberrations, such as spherical and
chromatic aberrations, astigmatism, comatic flare, and distortion.
AGC: Abreviation
of Automatic Gain Control. A feature built in a camera to automatically
control gain level.
ALC
CONTROL (Automatic Light Compensation): Photometric
control that sets the auto-iris to react to bright objects in a picture
that does not affect the overall video level. Turning the control
towards Peak will increase sensitivity, towards Average will decrease
sensitivity. It is normally set to "Average" under factory-shipped
conditions.
ANGLE
OF VIEW (Angular Field): The
angular range that can be covered within the image field. Small focal
lengths give a wide angle of view (wideangle), and large focal lengths
give a narrow angle of view (telephoto). (ref. Field of View)
APERTURE
RATIO: The
ratio of the effective lens opening to its focal length (1/ F#)
ASPHERICAL: An
optical element processed with non-spherical surface(s). There are a
couple of different ways to create aspherics; e.g. grinding, press
molding, injection molding and hybrid methods, any of which requires
high-precision technology.
AUTO-IRIS
LENS: A
lens with an electrically controlled iris. The circuit controlling the
iris is set to maintain a constant video level in varying lighting
conditions. Depending on the placement of the driving circuitry (i.e.
on the lens side or incorporated on the camera side), there are two
types of Auto-Iris; with a driving circuitry built in and DC meter
(galvanometer) only. Make sure to identify, before ordering an AI lens,
whether the camera outputs video signal or DC current to actuate the
auto-iris. (ref. DC-Type Lens)
BACK
FOCUS (Back Focal Distance): The
distance from the rear-most portion of the lens element to the image
plane. It is important to adjust the back focus correctly in order to
obtain the best image. Certain lenses come with a back focus adjustment
mechanism, while others do not. Also, most of the cameras incorporate
back focus adjustment, if it is not available on the lens side.
BARREL: The
chassis of a lens, usually cylindrical, that contains the lens elements
and iris diaphragm.
CCD
Iris: Automatic
brightness level adjustment feature built in certain types of camera.
Number of steps (multiple levels of brightness) available varies
dependent on the camera model. While there are tremendous advantages to
use a camera with CCD Iris, use of lenses with manual and/or Auto-iris
will enhance the efficiency of the camera in certain set-up conditions.
COATING: A
thin coating applied to the lens surfaces to reduce reflections, thus
increasing the amount of light transmission. Also, for color-corrected
lenses, it significantly contributes to rendering optimal color balance
of the lens. Sophisticated coating techniques allow applying as many as
seven layers.
DC-TYPE
LENS (lens with Galvanometer iris): An
auto-iris lens without a driving circuit to actuate the iris. Iris
control voltage is supplied from a circuit located within the camera.
FIELD
OF VIEW: The
maximum area in angular field that can be seen through a lens or an
optical system. (ref. Angle of View)
FIXED
FOCUS: Lenses
that are not provided with a means of focusing operation regardless of
the distance to the subject. .
FLANGE
BACK (Flange Back Focal Distance): The
distance from the mechanical flange of the lens (rear edge surface of
the lens mount) to the focal plane. C-mount lenses have a flange back
distance of 17.526mm while CS-mount lenses have 12.5mm. Because of
this, C-mount lenses can be used on CS-mount cameras with an adapter
ring of 5mm thickness (however, CS-mount lenses cannot be used on
C-mount cameras).
F-NUMBER
(F/#): Expression
denoting the ratio of the equivalent focal length of a lens to the
diameter of its entrance pupil (smaller F/# provides larger aperture of
the lens, transmitting greater amount of light).
FOCAL
LENGTH: The
basic parameter to determine the image position, magnification, and
angle of view of a lens.
GAIN
CONTROL: A
control that allows adjustment of iris response speed of Auto-Iris
lenses. When an oscillation or "chattering" (iris opens and closes
rapidly in bright light) occurs, reduce the gain level until iris stops
oscillating.
IMAGE
SIZE: Reference
to the size of an image formed by the lens onto the camera pick-up
device. The current standards are: 1", 2/3", 1/2", and 1/3",
corresponding to 16mm, 11mm, 8mm and 6mm measured diagonally.
LEVEL
CONTROL: Main
iris control. Used to set the auto-iris circuit to a video level
desired by the user. After set-up, the circuit will adjust the iris to
maintain this video level in changing lighting conditions. Turning the
control towards High will open the iris, towards Low will close the
iris.
MANUAL
IRIS LENS: A
lens with a manual adjustment to set the iris opening (F-stop) to a
given position. Generally used for relatively constant lighting
applications.
MINIMUM
OBJECT DISTANCE (M.O.D.): The
closest focusing distance of a lens. A measurement from the vertex
(front) of the lens to the object. Wide angle lenses generally have a
smaller M.O.D. than large focal length lenses (telephoto).
NEUTRAL
DENSITY (ND) FILTER: A
type of filter to reduce the amount of light transmission without
cutting of any particular frequency range of the light. Some lenses
incorporate ND filter as a built-in feature for the purpose of helping
the diaphragm function toward the minimum aperture range. Optional
filters of different diameters are available for attachment to the
front of a lens (ND 2X, 4X, etc.).
OBJECT
DISTANCE: Distance
to the object from the front element surface of the lens.
PRE-POSITION
LENS (Preset Lens): Zoom
lenses which incorporate variable-resistors (potentio meter) to index
zoom, focus and/or aperture positions to the lens controller. After
initial set-up, this allows the operator to view different preset areas
quickly without having to readjust the zoom, focus and/or aperture each
time.
SPOT
FILTER: A
supplement to the iris which allows the lens to have a larger aperture
opening than is physically possible with the iris only. These usually
range from F/88 to F/1600. This allows very sensitive cameras to view
bright scenes easily. The iris of a lens without a spot filter would
not be able to close down enough in bright light without creating an
image degradation caused by refraction.
VARIFOCAL
LENS: Optical
assembly containing several movable elements to permit changing the
effective focal length (EFL). Unlike a zoom lens a varifocal lens
requires refocusing with each change.
VIDEO
TYPE LENS: An
auto-iris lens with an internal circuit that converts the video signal
to DC voltages that control the iris meter (galvanomic meter) (ref.
Auto-Iris Lens).
VIGNETTING: Fall-off
of light illumination observed at the image corners. When gradual, it
is likely to be inherent to the optical system. In the case of eclipse,
it might be caused by mechanical factors such as housing. (Port hole
effect as when a 1/2" lens is viewed on a 1" camera is a result of
smaller image circle of the lens as opposed to the size of the imager).
ZOOM
LENS: A
lens that delivers different focal lengths without creating a shift of
focus regardless of the focal length setting.
ZOOM
RATIO: The
ratio of the starting focal length (wide end) to the ending focal
length (tele end) of a zoom lens. A lens with a 10X zoom ratio will
magnify the image at the tele-end by 10 times.
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Lenses
dimensions
1- Source Raymax, Co. Japan
2- Source Toknia, Co. Japan
3- Source Pentax, Co. Japan
 45cm x 17cm
1000/2000mm lenses |
550/1100mm lenses |
1680mm lens |
300mm lenses |
Photos Gallary
EV3000-S-1000
with 1000/2000mm lenses
