Optical Notch Filter - Uv Filter For Nikon D40 - Oil Filter Bypass Valve.

Optical Notch Filter

optical notch filter

    notch filter
  • A specialized kind of equalizer that can be tuned to "notch out" problem frequencies without affecting neighboring frequency bands. Usually used to kill feedback frequencies. Equinox features two switchable notch filters.

  • A filter that attenuates signals within a very narrow band of frequencies

  • In signal processing, a band-stop filter or band-rejection filter is a filter that passes most frequencies unaltered, but attenuates those in a specific range to very low levels. It is the opposite of a band-pass filter.

  • A circuit that takes a small "slice" out of the bandpass tuned by a receiver; this is useful for reducing interference from narrow bandwidth signals.

  • Of or relating to sight, esp. in relation to the physical action of light

  • ocular: relating to or using sight; "ocular inspection"; "an optical illusion"; "visual powers"; "visual navigation"

  • Devised on the principles of optics

  • Constructed to assist sight

  • of or relating to or involving light or optics; "optical supplies"

  • ocular: of or relating to or resembling the eye; "ocular muscles"; "an ocular organ"; "ocular diseases"; "the optic (or optical) axis of the eye"; "an ocular spot is a pigmented organ or part believed to be sensitive to light"

Canon EF 50mm f/2.5 Compact Macro

Canon EF 50mm f/2.5 Compact Macro


(From Canon)

A superior-performance lens offering excellent optics and focusing from infinity down to one-half life size (0.5x). Its nine-element design features a floating optical system, which ensures top-notch performance even at close focusing distances. Light and compact, it functions beautifully as a general-purpose normal lens. The optional accessory Life Size Converter EF enables focusing down to life size (1:1), and actually increases working distance - very desirable in close-up shooting.

Focal Length & Maximum Aperture: 50mm 1:2.5
Lens Construction: 9 elements in 8 groups
Diagonal Angle of View: 46°
Focus Adjustment: Front group linear extension system with AFD
Closest Focusing Distance: 0.23m / 0.8 ft. (film plane to subject)
Filter Size: 52mm
Max. Diameter x Length, Weight: 2.7" x 2.5", 9.9 oz. / 67.6 x 63.0mm, 280g


optical illusion

optical illusion

You may not see it at first, but the yellow spaces read the word optical, the blue landscape reads the word illusion. Look again! Can you see why this painting is called an optical illusion?

optical notch filter

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