{"product_id":"ソニー-500mm-f8-relfex-1","title":"USED SONY 500mm F8 Reflex","description":"\u003cp\u003eA catadioptric telephoto lens that achieves autofocus through innovations in its AF sensor and mirror lens structure. Unlike conventional refractive telephoto lenses, its reflective optical system fundamentally eliminates chromatic aberration, a common cause of image degradation in refractive telephoto lenses. This results in exceptionally sharp images. It also features a focus hold button for enhanced operability. The compact body length contributes to a surprisingly lightweight and compact design for a telephoto lens. It is ideal for nature photography, such as mountain, landscape, and wildlife photography, where minimizing equipment weight is crucial.\u003cbr\u003e\u003cbr\u003eAutofocus Enabled Catadioptric Telephoto Lens\u003cbr\u003e\u003cbr\u003eAutofocus typically relies on light rays passing through the lens at around F6.7 to F8 for distance measurement. This is why AF cannot operate with lenses that have a maximum aperture darker than F6.7. The key to enabling AF in the 500mm F8 Reflex lies in the high sensitivity of the CCD AF sensor and the design of the catadioptric telephoto lens. In conventional catadioptric telephoto lenses, the secondary mirror in front of the lens obstructs the light rays used for AF distance measurement. To address this, the secondary mirror was made smaller, and the light-gathering power of the primary mirror at the rear of the lens was increased. Aberrations generated by this were corrected at the rear, achieving autofocus while maintaining high sharpness.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eFormat: Full-frame compatible\u003c\/li\u003e\n\u003cli\u003eName: 500mm F8 Reflex\u003c\/li\u003e\n\u003cli\u003e35mm equivalent focal length: 750mm\u003c\/li\u003e\n\u003cli\u003eLens construction: 5 groups, 7 elements (including 1 filter)\u003c\/li\u003e\n\u003cli\u003eAngle of view (APS-C): 3°10'\u003c\/li\u003e\n\u003cli\u003eAngle of view (35mm format): 5°\u003c\/li\u003e\n\u003cli\u003eAperture blades: None\u003c\/li\u003e\n\u003cli\u003eMinimum aperture (F): 8 (fixed)\u003c\/li\u003e\n\u003cli\u003eMinimum focusing distance: 4m\u003c\/li\u003e\n\u003cli\u003eMaximum magnification ratio: 0.13x\u003c\/li\u003e\n\u003cli\u003eADI metering: ×\u003c\/li\u003e\n\u003cli\u003eFilter diameter: 42mm (dedicated)\u003c\/li\u003e\n\u003cli\u003eSupplied hood: Screw-in type\u003c\/li\u003e\n\u003cli\u003eDimensions (max diameter × length): 89mm × 118mm\u003c\/li\u003e\n\u003cli\u003eWeight: Approx. 665g\u003c\/li\u003e\n\u003cli\u003eTeleconverter compatible ×1.4: Not usable\u003c\/li\u003e\n\u003cli\u003eTeleconverter compatible ×2.0: Not usable\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"CFJ","offers":[{"title":"Default Title","offer_id":53919579668773,"sku":"2415250500183","price":434.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1024\/5816\/3493\/files\/2415250500183-1-1.jpg?v=1794551606","url":"https:\/\/camera-factory-japan.com\/products\/%e3%82%bd%e3%83%8b%e3%83%bc-500mm-f8-relfex-1","provider":"Camera Factory Japan","version":"1.0","type":"link"}