In optics, defocus is the aberration in which an image is simply out of focus. This aberration is familiar to anyone who has used a camera, videocamera, microscope, telescope, or binoculars. Optically, defocus refers to a translation of the focus along the optical axis away from the detection surface. In general, defocus reduces the sharpness and contrast of the image. What should be sharp, high-contrast edges in a scene become gradual transitions. Fine detail in the scene is blurred or even becomes invisible. Nearly all image-forming optical devices incorporate some form of focus adjustment to minimize defocus and maximize image quality.
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| - غبش بصري (ar)
- Defocus aberration (en)
- Sfocatura (it)
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| - الغبش البصري هو نوع من أنواع الزيغ الذي يحدث عندما لا تلتقي كل الفوتونات القادمة من نقطة واحدة في جسم ما، عند نفس النقطة على حساس الكاميرا أو حتى شبكية العين. النتيجة من هذا هو صورة ضبابية متداخلة في بعضها، حيث أن الفوتنات القادمة من نقطة واحدة في الجسم, تنتشر على بقعة بدل نقطة مثل الواقع. (ar)
- In optics, defocus is the aberration in which an image is simply out of focus. This aberration is familiar to anyone who has used a camera, videocamera, microscope, telescope, or binoculars. Optically, defocus refers to a translation of the focus along the optical axis away from the detection surface. In general, defocus reduces the sharpness and contrast of the image. What should be sharp, high-contrast edges in a scene become gradual transitions. Fine detail in the scene is blurred or even becomes invisible. Nearly all image-forming optical devices incorporate some form of focus adjustment to minimize defocus and maximize image quality. (en)
- In ottica, la sfocatura è l'aberrazione per cui un'immagine è fuori fuoco; otticamente, con sfocatura ci si riferisce a una traslazione del fuoco lungo l'asse ottico, lontano dalla superficie di rilevamento. In generale, la sfocatura riduce la e il contrasto dell'immagine: quelli che dovrebbero essere bordi nitidi e ad alto contrasto, in una scena, diventano transizioni graduali e i minimi sono sfocati o addirittura invisibili. (it)
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| - الغبش البصري هو نوع من أنواع الزيغ الذي يحدث عندما لا تلتقي كل الفوتونات القادمة من نقطة واحدة في جسم ما، عند نفس النقطة على حساس الكاميرا أو حتى شبكية العين. النتيجة من هذا هو صورة ضبابية متداخلة في بعضها، حيث أن الفوتنات القادمة من نقطة واحدة في الجسم, تنتشر على بقعة بدل نقطة مثل الواقع. (ar)
- In optics, defocus is the aberration in which an image is simply out of focus. This aberration is familiar to anyone who has used a camera, videocamera, microscope, telescope, or binoculars. Optically, defocus refers to a translation of the focus along the optical axis away from the detection surface. In general, defocus reduces the sharpness and contrast of the image. What should be sharp, high-contrast edges in a scene become gradual transitions. Fine detail in the scene is blurred or even becomes invisible. Nearly all image-forming optical devices incorporate some form of focus adjustment to minimize defocus and maximize image quality. (en)
- In ottica, la sfocatura è l'aberrazione per cui un'immagine è fuori fuoco; otticamente, con sfocatura ci si riferisce a una traslazione del fuoco lungo l'asse ottico, lontano dalla superficie di rilevamento. In generale, la sfocatura riduce la e il contrasto dell'immagine: quelli che dovrebbero essere bordi nitidi e ad alto contrasto, in una scena, diventano transizioni graduali e i minimi sono sfocati o addirittura invisibili. Questa aberrazione è familiare a chiunque abbia usato una macchina fotografica, una videocamera, un microscopio, un telescopio o un binocolo; quasi tutti i dispositivi ottici di formazione dell'immagine incorporano una qualche forma di regolazione della messa a fuoco per ridurre al minimo la sfocatura e massimizzare la qualità dell'immagine. A partire dalla metà degli anni novanta, in fotografia si è sviluppato un utilizzo creativo delle proprietà ottiche delle sfocature create dagli obiettivi, definito ed esaltato come bokeh. (it)
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