{"product_id":"long-perng-2-0-8x-field-flattener-reducer-for-f-5-f-7-refractor-telescopes-with-m42-t-t2-thread","title":"Long Perng 2” 0.8x Field Flattener \/ Reducer for f\/5 - f\/7 Refractor Telescopes (with M42 T\/T2 Thread)","description":"\u003cdiv class=\"product info short_description\"\u003e\n\u003ch4\u003eQuick Overview\u003c\/h4\u003e\n\u003cdiv class=\"value\"\u003e\n\u003cdiv class=\"product attribute short_description\"\u003e\n\u003cdiv class=\"value\"\u003e\n\u003cul\u003e\n\u003cli\u003eLong Perng 2” 0.8x focal reducer\/field flattener for refractors of focal ratio f\/5 to f\/7\u003c\/li\u003e\n\u003cli\u003eFlattens image field for cameras with APS-C or smaller sensors\u003c\/li\u003e\n\u003cli\u003eIntegrated T\/T2 M42 thread for camera attachment (an M48 version of this reducer is also available separately)\u003c\/li\u003e\n\u003cli\u003eCNC machined body with hard, gloss, black anodized finish\u003c\/li\u003e\n\u003cli\u003eFeatures 2\" nosepiece with safety groove\u003c\/li\u003e\n\u003cli\u003eRequires 55mm back focus\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"product info description\"\u003e\n\u003ch4\u003eProduct Details\u003c\/h4\u003e\n\u003cdiv class=\"value\"\u003e\n\u003cdiv class=\"product attribute description\"\u003e\n\u003cdiv class=\"value\"\u003e\n\u003cp\u003eThe Long-Perng 0.8x focal reducer\/field flattener # K0.8X-AU minimizes field curvature caused by the objective lenses of fast refractors and provides a sharper image across the camera sensor. It also reduces the effective focal length of a telescope by 0.8x to allow wider-field imaging and faster exposure times.\u003c\/p\u003e\n\u003cp\u003eThe optical design of this reducer\/flattener makes it optimal for use with refractors with a focal ratio of approximately f\/5 to f\/7 when used with an APS-C sensor. With smaller sensor 1” and 4\/3” cameras, it can work well with refractors slightly outside this range of focal ratio.\u003c\/p\u003e\n\u003cp\u003eWith standard male M42x0.75 T\/T2 threads to interface with the camera, this 2” reducer\/flattener provides a clear aperture of 38mm which is suitable for use with cameras with APS-C sensors and smaller.\u003c\/p\u003e\n\u003cp\u003eAn M48-threaded version of this item is also sold separately. Or you can buy an optional Long Perng M48x0.75 adapter to convert this M42 version to the M48 version later should you want to have both options. When used in the M48 configuration, this item delivers an image circle of 42mm, almost large enough for use with full-frame cameras.\u003c\/p\u003e\n\u003cp\u003eThe flattener’s nosepiece slides into any standard 2” telescope focuser.\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eNote\u003c\/strong\u003e: The nosepiece has a female M48x0.6 thread on the telescope side and will only accept Orion 2” filters - it will NOT accept most other 2” filters on the market which use the more common M48x0.75 threads.\u003c\/p\u003e\n\u003cp\u003eThe Long Perng 2” 0.8x reducer\/flattener requires a standard back focus of 55mm. This makes it ideal for DSLR cameras with a standard T-ring (sold separately). It also works with most other astronomy cameras when matched with suitable extension rings (sold separately).\u003c\/p\u003e\n\u003cp\u003eThis reducer\/flattener features fully multi-coated optics in an anodized CNC-machined aluminum body with a polished gloss black finish.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"product info ca_extra_info\"\u003e\n\u003ch4\u003eOther Information\u003c\/h4\u003e\n\u003cdiv class=\"value\"\u003e\n\u003cdiv class=\"product attribute ca_extra_info\"\u003e\n\u003cdiv class=\"value\"\u003e\n\u003cul\u003e\n\u003cli\u003eCountry of Manufacture: Taiwan\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Long Perng","offers":[{"title":"Default Title","offer_id":41470746886257,"sku":"LON-K0.8X-AU01","price":111.95,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0851\/2766\/files\/apo-reducer-08x.jpg?v=1776458942","url":"https:\/\/khanscope.com\/en-fr\/products\/long-perng-2-0-8x-field-flattener-reducer-for-f-5-f-7-refractor-telescopes-with-m42-t-t2-thread","provider":"Khan Scope Centre","version":"1.0","type":"link"}