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Starizona Apex-ED S 0.65x reducer flattener
Beskrivelse av varen
Tilstand: Som ny - Ikke synlig brukt
Nesten ubrukt, ingen mekaniske eller optiske feil. Skikkelig god premium reducer. Dette er «S» versjonen.
The flattener is a lens that evens out the field, as this is slightly curved by the primary optics. This curvature causes stars that are imaged at the edge of the field of view to be less sharp. The flattener, also called a field flattener, corrects this effect. Astrophotographers can then enjoy images where the stars remain sharp right out to the edge of the exposure. The flattener is installed between the telescope and the camera.
The Reducer (for focal length reduction) is an optical accessory that allows a more favourable aperture ratio. Required exposure times are hence shorter and the optics 'faster'. Also, the field of view increases, so that even larger astronomical objects can be observed or photographed.
With the Apex ED reducer, an f/5.5 apo refractor becomes an incredibly fast f/3.6 astrograph. A slower f/9 telescope like an RC becomes a speedy f/5.9 system. The reduction factor provides a 1.5x wider field of view and shortens exposure times by a factor of 2.4x!
The Apex ED reducer features extra-low disperion glass to eliminate chromatic aberration and to provide sharp star images over a 30mm image circle, capable of working with most popular CCD, CMOS and DSLR cameras up to APS-C format.
The Apex ED reducer fits into a standard 2" focuser. It has M42 T-threads on the camera side, and it can accept a standard 2" (M48) filter on the telescope side for easy use of light-pollution or other filters. On Meade ACF telescopes, the Apex can be attached using a 2" visual back.
"L" and "S" Versions: To optimize the Apex ED for the best possible performance, there are two versions of the lens. The "S" version is for telescopes with focal lengths from 300-500mm, including most 60-80mm apo refractors.
Backfocus: The nominal backfocus distance from the Apex ED reducer's T-threads to the image sensor depends slightly on the focal length of the telescope. It is at least 55mm in all configurations. The table below shows the optimum backfocus for various focal lengths.
Backfocus Short-Version
<350mm: 62mm
350-450mm: 60mm
450-500mm: 59mm
https://www.teleskop-express.de/en/astrophotography-and-photography-15/imaging-correctors-for-telescopes-138/starizona-apexed-s-0-65x-reducer-flattener-short-focal-length-version-12812
Søkeord: teleskop, refraktor, stjernekikkert, astrofoto, astrofotografering, apo, apokromatisk, skywatcher, william optics, stellarvue, zwo, svbony
NB: Knappen for å vise hele beskrivelsen har kun en visuell effekt.
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Sist endret: 13.5.2026 kl. 13:05 ・ FINN-kode: 463465217
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