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Subject Item
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减焦镜 Telecompressor Telekompressor
rdfs:comment
减焦镜是一种光学组件，用于放置在望远镜或镜头的后组，通过进一步汇聚光线，以达到降低焦距的目的。 同时由于光线的汇聚，使得等效面积的光通量增加，用于曝光计算时，T光圈增加。这一点刚好与增距镜相反。 A telecompressor or focal reducer is an optical element used to reduce focal length, increase lens speed, and in some instances improve optical transfer function (OTF) performance. It is also widely known under the name “Speed Booster”, which is the commercial name of a line of telecompressors by the manufacturer Metabones. Popular applications include photography, videography, and astrophotography. In astrophotography, these qualities are most desirable when taking pictures of nearby large objects, such as nebulae. The effects and uses of the telecompressor are largely opposite to those of the teleconverter or Barlow lens. A combined system of a lens and a focal reducer has smaller back focus than the lens alone; this places restrictions on lenses and cameras that focal reducer might be u Ein Telekompressor, oft auch Weitwinkelkonverter, Brennweitenreduzierer oder Turbo-Adapter, englisch Telecompressor, Focal Reducer, Speedbooster oder Speed Booster genannt, ist ein optischer Objektivadapter für Kameraobjektive mit der entgegengesetzten Wirkung eines Telekonverters. Er sieht ähnlich wie ein Telekonverter aus und wird ebenso zwischen Objektiv und Kamera montiert. Er reduziert die Brennweite des optischen Systems um einen angegebenen Faktor, gleichzeitig erhöht sich die Lichtstärke um diesen Faktor und die Belichtungszeiten verkürzen sich bei gleichem Belichtungsindex entsprechend.
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减焦镜是一种光学组件，用于放置在望远镜或镜头的后组，通过进一步汇聚光线，以达到降低焦距的目的。 同时由于光线的汇聚，使得等效面积的光通量增加，用于曝光计算时，T光圈增加。这一点刚好与增距镜相反。 A telecompressor or focal reducer is an optical element used to reduce focal length, increase lens speed, and in some instances improve optical transfer function (OTF) performance. It is also widely known under the name “Speed Booster”, which is the commercial name of a line of telecompressors by the manufacturer Metabones. Popular applications include photography, videography, and astrophotography. In astrophotography, these qualities are most desirable when taking pictures of nearby large objects, such as nebulae. The effects and uses of the telecompressor are largely opposite to those of the teleconverter or Barlow lens. A combined system of a lens and a focal reducer has smaller back focus than the lens alone; this places restrictions on lenses and cameras that focal reducer might be used with. Lens adapters that include telecompressors are useful with digital mirrorless cameras. By combining a telecompressor within a lens adapter, mirrorless cameras can use the lenses of both digital single-lens reflex cameras (DSLRs) and film-based SLR (Single-lens reflex cameras). * Digital telecompressor (0,64x) for Canon EF lenses with Micro Four Thirds camera bodies * Mount for Micro Four Thirds camera bodies with eleven gold contacts * Side view with aperture control rocker (above optical axis) and USB socket with rubber cover (below optical axis) * Mount for Canon EF lenses (full-format) with eight gold contacts Ein Telekompressor, oft auch Weitwinkelkonverter, Brennweitenreduzierer oder Turbo-Adapter, englisch Telecompressor, Focal Reducer, Speedbooster oder Speed Booster genannt, ist ein optischer Objektivadapter für Kameraobjektive mit der entgegengesetzten Wirkung eines Telekonverters. Er sieht ähnlich wie ein Telekonverter aus und wird ebenso zwischen Objektiv und Kamera montiert. Er reduziert die Brennweite des optischen Systems um einen angegebenen Faktor, gleichzeitig erhöht sich die Lichtstärke um diesen Faktor und die Belichtungszeiten verkürzen sich bei gleichem Belichtungsindex entsprechend.
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