{"title":"Astro-Photography Filter Circular Types","description":"","products":[{"product_id":"mc-r640-82mm","title":"KANI R640 Nebula Photography Filter(40.5mm - 82mm)","description":"\u003cdiv style=\"font-family:Arial,sans-serif; line-height:1.9; color:#222;\"\u003e\n\n\u003ch2 style=\"font-size:32px; margin-bottom:15px;\"\u003e\nKANI R640 Nebula Photography Filter\n\u003c\/h2\u003e\n\n\u003cp\u003e\nThe KANI R640 Nebula Photography Filter is a specialized astrophotography filter developed for capturing nebulae and deep-sky objects with enhanced contrast and reduced light pollution interference.\n\u003c\/p\u003e\n\n\u003cp\u003e\nThis filter was developed under the supervision of astrophotographer \u003cstrong\u003eAkio Nakanishi\u003c\/strong\u003e in response to strong requests from astrophotography enthusiasts.\nAlthough similar filters from major manufacturers were discontinued due to limited market demand, the R640 remains an important and highly desired filter for serious nebula photography.\n\u003c\/p\u003e\n\n\u003cp\u003e\nDesigned specifically for astrophotography, the R640 filter enhances H-alpha emission visibility while effectively suppressing unwanted light pollution, allowing photographers to capture cleaner and more detailed nebula images even under urban or semi-urban skies.\n\u003c\/p\u003e\n\n\u003cdiv style=\"background:#f5f5f5; padding:22px; border-radius:12px; margin:35px 0;\"\u003e\n\n\u003ch3 style=\"font-size:26px; margin-top:0;\"\u003e\nKey Features\n\u003c\/h3\u003e\n\n\u003cul style=\"padding-left:22px; margin-bottom:0;\"\u003e\n\n\u003cli\u003eSpecialized filter designed for nebula and astrophotography\u003c\/li\u003e\n\n\u003cli\u003eEnhances H-alpha emission visibility\u003c\/li\u003e\n\n\u003cli\u003eEffectively reduces light pollution interference\u003c\/li\u003e\n\n\u003cli\u003eDeveloped under the supervision of astrophotographer Akio Nakanishi\u003c\/li\u003e\n\n\u003cli\u003eUltra-thin 1.1mm optical glass design minimizes image degradation\u003c\/li\u003e\n\n\u003cli\u003eHigh-quality surface precision for excellent image sharpness\u003c\/li\u003e\n\n\u003cli\u003eMulti-layer coating reduces reflections and improves contrast\u003c\/li\u003e\n\n\u003cli\u003eIdeal for astrophotography and deep-sky imaging\u003c\/li\u003e\n\n\u003cli\u003eSuitable for astro-modified cameras and dedicated astro camera models\u003c\/li\u003e\n\n\u003cli\u003eAvailable sizes: 40.5mm \/ 52mm \/ 67mm \/ 77mm \/ 82mm\u003c\/li\u003e\n\n\u003c\/ul\u003e\n\n\u003c\/div\u003e\n\n\u003ch3 style=\"font-size:26px;\"\u003e\nOptimized for Nebula Photography\n\u003c\/h3\u003e\n\n\u003cp\u003e\nThe R640 filter is specifically designed to improve the visibility of nebula structures by transmitting wavelengths associated with H-alpha emissions while reducing the impact of artificial lighting and atmospheric light pollution.\n\u003c\/p\u003e\n\n\u003cp\u003e\nNebula photography often requires capturing extremely faint light sources in the night sky.\nThe R640 filter helps astrophotographers isolate important wavelengths while minimizing unwanted light contamination from urban environments.\n\u003c\/p\u003e\n\n\u003cp\u003e\nThis allows for clearer nebula structures, richer contrast, and more dramatic deep-sky images, especially when photographing emission nebulae.\n\u003c\/p\u003e\n\n\u003ch3 style=\"font-size:26px;\"\u003e\nUltra-Thin 1.1mm Optical Glass\n\u003c\/h3\u003e\n\n\u003cp\u003e\nOne of the major features of the KANI R640 filter is its ultra-thin \u003cstrong\u003e1.1mm optical glass design\u003c\/strong\u003e.\nCompared to conventional filters with glass thicknesses around 2mm to 2.5mm, the thinner glass helps reduce the impact on imaging performance and minimizes optical degradation.\n\u003c\/p\u003e\n\n\u003cp\u003e\nThis design is particularly beneficial for astrophotography where maintaining precise focus accuracy and minimizing aberrations are extremely important.\n\u003c\/p\u003e\n\n\u003ch3 style=\"font-size:26px;\"\u003e\nHigh Optical Quality\n\u003c\/h3\u003e\n\n\u003cp\u003e\nThe filter uses high-quality optical glass with excellent surface precision and advanced multi-layer coating technology.\nThis combination helps reduce reflections and unwanted flare while improving image contrast and clarity during long-exposure astrophotography.\n\u003c\/p\u003e\n\n\u003cp\u003e\nCompared to older conventional filters, the KANI R640 filter provides improved image quality and better overall optical performance for serious astrophotography applications.\n\u003c\/p\u003e\n\n\u003ch3 style=\"font-size:26px;\"\u003e\nExposure Multiplier\n\u003c\/h3\u003e\n\n\u003cp\u003e\nThe exposure multiplier of the R640 filter varies depending on the camera type and sensor sensitivity.\n\u003c\/p\u003e\n\n\u003cul style=\"padding-left:22px;\"\u003e\n\n\u003cli\u003e\nAstro-modified cameras and manufacturer astro models with strong H-alpha sensitivity typically require approximately 5x to 6x exposure compensation.\n\u003c\/li\u003e\n\n\u003cli\u003e\nIn environments with significant light pollution, exposure compensation may exceed 10x due to the strong light pollution reduction effect.\n\u003c\/li\u003e\n\n\u003cli\u003e\nStandard DSLR cameras without infrared modification may require exposure compensation above 10x because of reduced sensitivity to wavelengths longer than 640nm.\n\u003c\/li\u003e\n\n\u003c\/ul\u003e\n\n\u003ch3 style=\"font-size:26px;\"\u003e\nRecommended Applications\n\u003c\/h3\u003e\n\n\u003cul style=\"padding-left:22px;\"\u003e\n\n\u003cli\u003eNebula photography\u003c\/li\u003e\n\n\u003cli\u003eAstrophotography\u003c\/li\u003e\n\n\u003cli\u003eDeep-sky imaging\u003c\/li\u003e\n\n\u003cli\u003eH-alpha enhanced imaging\u003c\/li\u003e\n\n\u003cli\u003eNight sky photography\u003c\/li\u003e\n\n\u003cli\u003eUrban astrophotography with light pollution reduction\u003c\/li\u003e\n\n\u003cli\u003eLong exposure astrophotography\u003c\/li\u003e\n\n\u003c\/ul\u003e\n\n\u003ch3 style=\"font-size:26px;\"\u003e\nAvailable Sizes\n\u003c\/h3\u003e\n\n\u003ctable style=\"width:100%; border-collapse:collapse; margin:20px 0;\"\u003e\n\n\u003ctr\u003e\n\n\u003cth style=\"border:1px solid #ddd; padding:12px; background:#f2f2f2;\"\u003e\nAvailable Sizes\n\u003c\/th\u003e\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd; padding:12px;\"\u003e\n40.5mm \/ 52mm \/ 67mm \/ 77mm \/ 82mm\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\n\u003c\/table\u003e\n\n\u003ch3 style=\"font-size:26px;\"\u003e\nSpecifications\n\u003c\/h3\u003e\n\n\u003ctable style=\"width:100%; border-collapse:collapse; margin:20px 0;\"\u003e\n\n\u003ctr\u003e\n\n\u003ctd style=\"border:1px solid #ddd; padding:12px; background:#f8f8f8;\"\u003e\nFilter Type\n\u003c\/td\u003e\n\n\u003ctd style=\"border:1px solid #ddd; padding:12px;\"\u003e\nNebula Photography Filter\n\u003c\/td\u003e\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003ctd style=\"border:1px solid #ddd; padding:12px; background:#f8f8f8;\"\u003e\nMain Purpose\n\u003c\/td\u003e\n\n\u003ctd style=\"border:1px solid #ddd; padding:12px;\"\u003e\nNebula and astrophotography\n\u003c\/td\u003e\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003ctd style=\"border:1px solid #ddd; padding:12px; background:#f8f8f8;\"\u003e\nGlass Thickness\n\u003c\/td\u003e\n\n\u003ctd style=\"border:1px solid #ddd; padding:12px;\"\u003e\n1.1mm ultra-thin optical glass\n\u003c\/td\u003e\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003ctd style=\"border:1px solid #ddd; padding:12px; background:#f8f8f8;\"\u003e\nCoating\n\u003c\/td\u003e\n\n\u003ctd style=\"border:1px solid #ddd; padding:12px;\"\u003e\nMulti-layer coating\n\u003c\/td\u003e\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003ctd style=\"border:1px solid #ddd; padding:12px; background:#f8f8f8;\"\u003e\nAvailable Sizes\n\u003c\/td\u003e\n\n\u003ctd style=\"border:1px solid #ddd; padding:12px;\"\u003e\n40.5mm \/ 52mm \/ 67mm \/ 77mm \/ 82mm\n\u003c\/td\u003e\n\n\u003c\/tr\u003e\n\n\u003c\/table\u003e\n\n\u003cdiv style=\"background:#fff7e6; border-left:5px solid #d99a00; padding:20px; margin:35px 0;\"\u003e\n\n\u003cstrong\u003eImportant Note\u003c\/strong\u003e\u003cbr\u003e\u003cbr\u003e\n\nExposure settings will vary depending on camera type, sensor sensitivity, and light pollution conditions.\nAstro-modified cameras with strong H-alpha sensitivity are recommended for optimal performance.\n\n\u003c\/div\u003e\n\n\u003ch3 style=\"font-size:26px;\"\u003e\nWhy Choose KANI Astrophotography Filters\n\u003c\/h3\u003e\n\n\u003cp\u003e\nKANI filters are trusted by photographers worldwide for their optical quality and reliability.\nThe R640 Nebula Photography Filter was carefully developed for astrophotography enthusiasts who demand high image quality, reduced optical interference, and effective light pollution suppression.\n\u003c\/p\u003e\n\n\u003cp\u003e\nWhether photographing nebulae from dark skies or urban environments, the KANI R640 filter helps astrophotographers capture cleaner, sharper, and more dramatic deep-sky images.\n\u003c\/p\u003e\n\n\u003c\/div\u003e","brand":"KANI","offers":[{"title":"40.5mm","offer_id":53898143301998,"sku":"K14014","price":59.0,"currency_code":"JPY","in_stock":true},{"title":"52mm","offer_id":53898143334766,"sku":"K14016","price":59.0,"currency_code":"JPY","in_stock":true},{"title":"67mm","offer_id":53898143367534,"sku":"K14019","price":77.0,"currency_code":"JPY","in_stock":true},{"title":"77mm","offer_id":53898143400302,"sku":"K14021","price":79.0,"currency_code":"JPY","in_stock":true},{"title":"82mm","offer_id":53898143433070,"sku":"K14022","price":89.0,"currency_code":"JPY","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0986\/0238\/5774\/files\/K14014_01.jpg?v=1781231601"}],"url":"https:\/\/kanifilterjapan.com\/collections\/astrophotography-filter-circle-1.oembed","provider":"kanfilterjapan","version":"1.0","type":"link"}