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  2. Peleng lens - Wikipedia

    en.wikipedia.org/wiki/Peleng_lens

    Peleng 3.5/8A is an 8 mm super-wideangle circular fisheye photographic lens, and is designed as an interchangeable lens for Canon, Nikon, Pentax, Olympus digital or film cameras which have or do not have the instant-return diaphragm automatic control device [clarification needed]. The lens has a variable diaphragm from f/3.5 to f/16.

  3. Fisheye lens - Wikipedia

    en.wikipedia.org/wiki/Fisheye_lens

    In a circular fisheye lens, the image circle is inscribed in the film or sensor area; in a diagonal ("full-frame") fisheye lens, the image circle is circumscribed around the film or sensor area. This implies that using a fisheye lens for a different format than it was intended for is easy (as opposed to a rectilinear lens), and may change its ...

  4. Perspective distortion - Wikipedia

    en.wikipedia.org/wiki/Perspective_distortion

    The mood effect of perspective distortion achieved by rectilinear extreme wide-angle lenses is that the resulting image looks grotesque and unsettling, while not looking as unrealistic as curvilinear fisheye lenses which display barrel distortion. The effect is especially noticeable the closer the camera is to the subject, as its amount ...

  5. Pentax F 17-28mm lens - Wikipedia

    en.wikipedia.org/wiki/Pentax_F_17-28mm_lens

    The smc Pentax-F 17–28mm Fish-eye f / 3.5–4.5 is the first fisheye zoom lens, manufactured by Pentax for single-lens reflex cameras (SLRs) with a K lens mount.At its widest setting of 17mm, it affords a 180° diagonal angle of view images for all K-mount full-frame SLR cameras; at 28mm, the diagonal angle of view is reduced to 90° on the diagonal.

  6. Luneburg lens - Wikipedia

    en.wikipedia.org/wiki/Luneburg_lens

    Cross-section of Maxwell's fish-eye lens, with blue shading representing increasing refractive index. Maxwell's fish-eye lens is also an example of the generalized Luneburg lens. The fish-eye, which was first fully described by Maxwell in 1854 [5] (and therefore pre-dates Luneburg's solution), has a refractive index varying according to

  7. List of chat websites - Wikipedia

    en.wikipedia.org/wiki/List_of_chat_websites

    Chat-Avenue: Adobe Flash and PHP-based chat rooms: Yes Yes Yes Yes Yes No No Yes Chatroulette: Two-way live video streaming between random pairs of people No No Yes Yes Yes Yes No Yes Chaturbate: Two-way webcam model live video streaming: Yes No No Yes Yes No No Yes Discord: Group live video streaming and instant messaging: Yes Yes Yes Yes Yes ...

  8. Sigma 10mm f/2.8 EX DC Fisheye HSM lens - Wikipedia

    en.wikipedia.org/.../2.8_EX_DC_Fisheye_HSM_lens

    Unlike most fisheye lenses, this lens is designed for digital SLR cameras that do not have a full 36x24mm sensor. [1] This results in a much greater fisheye effect than is possible when a full-frame fisheye lens is used with a smaller sensor. The projection type of this lens is equidistant [2] This lens is available in Canon, Nikon, and Sigma ...

  9. Hemispherical photography - Wikipedia

    en.wikipedia.org/wiki/Hemispherical_photography

    Hemispherical photograph used to study microclimate of winter roosting habitat at the Monarch Butterfly Biosphere Reserve, Mexico.. Hemispherical photography, also known as canopy photography, is a technique to estimate solar radiation and characterize plant canopy geometry using photographs taken looking upward through an extreme wide-angle lens or a fisheye lens (Rich 1990).