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A hypercentric lens produces larger images the farther the object is away.Ī telecentric lens can be object-space telecentric, image-space telecentric, or bi-telecentric (also double-telecentric). An entocentric lens has a smaller magnification for objects farther away objects of the same size appear smaller the farther they are away. For such a lens the chief ray originating at any point off of the optical axis is never parallel to the optical axis, neither in front of nor behind the lens.Ī non-telecentric lens exhibits varying magnification for objects at different distances from the lens. In particular, a single lens without a separate aperture stop is entocentric. If a lens is not telecentric, it is either entocentric or hypercentric. The aperture stop selects the rays that are passed through the lens and the specific selection is what makes a lens telecentric. Telecentricity is not a property of the lenses inside the compound lens but is established by the location of the aperture stop in the lens. Commercially available telecentric lenses are often compound lenses that include multiple lens elements, for improved optical performance. This makes the chief rays (light rays that pass through the center of the aperture) on the other side of the lens parallel to the optical axis for any point in the field of view. The simplest way to make a lens telecentric is to put the aperture stop at one of the lens's focal points. Telecentric lenses are often used for precision optical two-dimensional measurements or reproduction and other applications that are sensitive to the image magnification or the angle of incidence of light.
#BETTER THAN SYSTEM LENS PRO#
Overall the OM SYSTEM 40-150mm f/4 Pro provides the end-user with a fuss-free experience.Bi-telecentric lens with 208 mm diameter front element and a C-mount camera interfaceĪ telecentric lens is a special optical lens (often an objective lens or a camera lens) that has its entrance or exit pupil, or both, at infinity. The zoom ring can be spun from 40mm to 150mm in one twist. This means the focus rings continually spins as there are no hard stopping points.
#BETTER THAN SYSTEM LENS MANUAL#
The manual focus ring is linear and not mechanical. This allows the lens to be much more compact when collapsed. If you do not do this the camera will tell you that the lens is locked and you will not be able to bypass the screen. To use the lens, you have to first unlock it by twisting the barrel until it clicks. I had no problems getting sharp images at 1/50s when at the 300mm equivalent focal range. However, the IBIS found in Olympus, and now OM SYSTEM cameras, make this lens easy to handhold (even one-handed) at very slow shutter speeds. It’s worth noting that the 40-150mm f/4 Pro does not feature any lens stabilization, which is a little strange for a lens with this focal range. The lack of physical controls, apart from the zoom ring and the manual focus ring, means there’s not much to fuss around with. The OM SYSTEM 40-150mm f/4 Pro is an easy lens to use.