{"product_id":"svbony-sv183-685nm-ir-pass-filter","title":"SVBONY SV183 685nm IR Pass Filter","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e685nm Infrared (IR) Pass Filter\u003c\/li\u003e\n\u003cli\u003eStandard 1.25\" Threaded Barrel\u003c\/li\u003e\n\u003cli\u003eTransmits \u0026gt;95% of light from 673nm to 1100nm\u003c\/li\u003e\n\u003cli\u003eBlocks Visible Light with OD2 Blocking from 400-660nm\u003c\/li\u003e\n\u003cli\u003e1\/4λ Surface Parallelism for Minimal Image Distortion\u003c\/li\u003e\n\u003cli\u003eConstructed with SCHOTT B260 Optical Glass\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eSVBONY SV183 685nm IR Pass Filter 1.25\" for Planetary Astrophotography\u003c\/h2\u003e\n\u003cp\u003eThe SVBONY SV183 685nm IR Pass Filter is a specialized tool for planetary imagers, designed to cut through atmospheric turbulence by isolating near-infrared light with a sharp 670nm cut-on. This 1.25\" filter uses SCHOTT B260 glass to achieve over 95% transmission in its passband (673-1100nm), capturing a steady signal that atmospheric seeing affects far less than visible light. The result is a sharper, more detailed monochrome image of planetary surfaces, especially during nights of average or poor seeing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eStabilize Atmospheric Seeing with \u0026gt;95% IR Transmission\u003c\/h3\u003e\n\u003cp\u003eThe primary function of the SV183 filter is to mitigate the effects of atmospheric turbulence, or \"seeing.\" Shorter wavelengths of light (like blue and green) are scattered more aggressively by air currents, causing the familiar shimmering effect. By blocking all light below 670nm and passing over 95% of light from 673nm to 1100nm, this filter allows you to capture only the longer, more stable infrared wavelengths, effectively \"freezing\" the image and revealing fine details on Jupiter's cloud bands or Martian surface features that would otherwise be blurred.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003ePrecision Optics: 1\/4λ Parallelism in a 1.1mm Substrate\u003c\/h3\u003e\n\u003cp\u003eA filter is useless if it degrades your telescope's optical quality. The SV183 is built on a high-grade SCHOTT B260 glass substrate with a thickness of just 1.1mm to minimize focus shift. Critically, it features a surface parallelism of 1\/4λ (lambda), ensuring the filter surfaces are optically flat and parallel to prevent introducing astigmatism or other distortions into the light path, preserving the sharpness of your planetary data.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eSV183 685nm vs. Red Filters: A Dedicated Seeing-Cutter\u003c\/h3\u003e\n\u003cp\u003eWhile a standard deep-sky red filter can offer some seeing reduction, the SV183 685nm is a far more aggressive and specialized tool. A typical red filter has a wider, more gradual passband, letting in significant visible light that is still susceptible to turbulence. The SV183's sharp 670nm cut-on creates a dedicated monochrome luminance channel purely in the near-IR spectrum.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSuperior Contrast:\u003c\/strong\u003e On planets like Mars and Jupiter, imaging in the 685nm+ range enhances the contrast of surface and cloud features.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMonochrome Imaging:\u003c\/strong\u003e This filter is intended for use with monochrome cameras to create a high-resolution luminance (L) layer, which can then be combined with color data (RGB) taken separately.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeeing Penetration:\u003c\/strong\u003e The OD2 blocking of visible light from 400-660nm ensures that only the most stable wavelengths reach your sensor, making it more effective than a generic red filter on nights with poor atmospheric stability.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the main purpose of the SVBONY SV183 685nm IR Pass filter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIts primary purpose is to improve planetary imaging by combating atmospheric turbulence (\"seeing\"). It blocks visible light and only passes near-infrared light (starting at 670nm), which is less affected by air currents. This results in a sharper, more stable image, allowing you to capture finer details on planets like Jupiter, Saturn, and Mars.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDo I need a monochrome camera to use the SV183 685nm filter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003e\u003cstrong\u003eYes, a monochrome camera is strongly recommended.\u003c\/strong\u003e A color camera has a Bayer matrix that blocks two-thirds of the incoming light for any given color. Since this filter passes only a narrow slice of the spectrum, using it with a color camera will result in a very dim, low-resolution red image. It is designed to be used with a mono camera to capture a high-detail luminance channel.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow will the SV183 685nm filter affect my exposure times for Jupiter with an 8\" SCT?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYou should expect significantly longer exposure times compared to imaging without a filter or with a standard UV\/IR cut filter. Because the SV183 blocks the entire visible spectrum where camera sensors are most sensitive, you will need to increase your gain, exposure time, or both to get a sufficiently bright histogram. This is a normal trade-off for the benefit of stabilized seeing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the SV183 685nm filter for deep-sky imaging of the Orion Nebula (M42)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhile technically possible, it is not ideal. Most of the interesting visual detail in emission nebulae like M42 comes from specific visible wavelengths like Hydrogen-alpha (656nm) and Oxygen-III (501nm). The SV183 blocks these entirely. You would only capture the faint, reflected infrared continuum, losing all the vibrant color and structure the nebula is known for.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does the 1\/4λ parallelism spec mean for the SV183 filter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \u003cstrong\u003e1\/4λ (one-quarter wavelength) parallelism\u003c\/strong\u003e is a measure of optical quality. It guarantees that the two faces of the filter glass are extremely parallel to each other. This prevents the filter from distorting the light passing through it, which could otherwise degrade image sharpness or introduce aberrations like astigmatism. It ensures the filter will not compromise the high-resolution images you are trying to capture.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the 685nm cutoff on the SV183 compare to using a standard red filter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eA standard red (R) filter for LRGB imaging typically starts passing light around 600nm. The SVBONY SV183 has a much sharper and deeper cutoff at 670nm. This makes it more effective at eliminating turbulent visible light. The SV183 is a specialized \"seeing cutter,\" whereas a red filter is a broadband component for color imaging that offers only a mild seeing-reduction benefit.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Type\u003c\/td\u003e\n\u003ctd\u003eIR Pass Filter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCut-On Wavelength\u003c\/td\u003e\n\u003ctd\u003e670nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePeak Transmission\u003c\/td\u003e\n\u003ctd\u003e\u0026gt;95% from 673-1100nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBlocking\u003c\/td\u003e\n\u003ctd\u003eOD2 @ 400-660nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWavelength Range\u003c\/td\u003e\n\u003ctd\u003e350-1100nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLens Material\u003c\/td\u003e\n\u003ctd\u003eSCHOTT B260\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSubstrate Thickness\u003c\/td\u003e\n\u003ctd\u003e1.1mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSurface Quality\u003c\/td\u003e\n\u003ctd\u003e60\/40\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSurface Parallelism\u003c\/td\u003e\n\u003ctd\u003e1\/4 λ\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eParallelism (Angle)\u003c\/td\u003e\n\u003ctd\u003e30”\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFrame Material\u003c\/td\u003e\n\u003ctd\u003eAviation Aluminum 6061T6\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eThreads\u003c\/td\u003e\n\u003ctd\u003eSingle Thread M28.5x0.6 (1.25\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eSVBONY SV183 685nm IR Pass Filter 1.25\"\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eProtective Plastic Case\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/svbony-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eSVBONY 1-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SVBONY","offers":[{"title":"1.25\" Round Mounted","offer_id":52861236248861,"sku":"SV-W9142A","price":26.0,"currency_code":"CAD","in_stock":true},{"title":"2\" Round Mounted","offer_id":52861236281629,"sku":"SV-W9142B","price":40.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/SVBONY-SV183-685nm-IR-Pass-Filter-1-25-for-Planetary-Astrophotography-1_2c98d5cf-6620-40ad-b04d-c336087bc7d2.jpg?v=1788660230","url":"https:\/\/davidastro.com\/fr\/products\/svbony-sv183-685nm-ir-pass-filter","provider":"David Astro","version":"1.0","type":"link"}