{"title":"Chroma Bessel UBVRI Photometric Filters","description":"\u003cp\u003eChroma Bessel filters are photometric filters matched to the standard Johnson-Cousins UBVRI system, used to measure star brightness and color in calibrated bands. The line includes individual U, B, V, R and I Bessel filters and a complete UBVRI filter set.\u003c\/p\u003e\u003cp\u003eThey suit observers doing variable star work, exoplanet transit timing, asteroid light curves or student research, where results must be comparable with professional catalogs. Chroma's hard-coated interference filters give stable passbands over time, an important point for long photometric programs.\u003c\/p\u003e","products":[{"product_id":"chroma-u-bessel-filter","title":"Chroma U-Bessel Filter","description":"\u003c!-- more --\u003e\u003cp\u003eUV photometric filter in UVBRI series\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eFilters designed for use with CCD and for f\/4.0 or slower\u003c\/li\u003e\n\u003cli\u003eNo reflections leading to image distortions or \"\"back reflections\"\"\u003c\/li\u003e\n\u003cli\u003eTransmitted wavefront better than 0.25 waves\/inch\u003c\/li\u003e\n\u003cli\u003eDurable sputter coatings\u003c\/li\u003e\n\u003cli\u003eParallelism: \u0026lt; 30 arcsec\u003c\/li\u003e\n\u003cli\u003eThickness: 3.0 +\/-0.05mm\u003c\/li\u003e\n\u003cli\u003eExtremely durable coatings withstand humidity changes and extreme temperature fluxes and remain spectrally accurate\u003c\/li\u003e\n\u003cli\u003ein CWL and band pass adherence\u003c\/li\u003e\n\u003cli\u003eCapable of manufacturing large filters for large detectors: 50mm x 50mm, 65mm up to 76.2mm and 101.6mm square\u003c\/li\u003e\n\u003cli\u003eAll filters manufactured in Vermont\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eChroma manufactures the highest quality astronomy filters with durable, sputtered hard coatings using single substrates of the best glass, eliminating the need for laminations. All primary filter coatings are applied on the front surface and anti-reflection coatings on the rear surface to prevent ghosting and to maximize transmission.\u003c\/p\u003e\u003cp\u003eHighly precise and accurate, the passbands of these filters remain spectrally stable and do not drift in response to extreme temperature fluctuations or changes in humidity. All filters may be used with apertures of f\/4 or smaller. They provide custom coating services for more demanding imaging applications requiring larger apertures such as f\/3 or f\/2. They also can provide larger sizes and unique passbands upon request.\u003c\/p\u003e","brand":"Chroma","offers":[{"title":"1.25\" Round Mounted","offer_id":44967249051933,"sku":"CT-27050-1.25M","price":385.0,"currency_code":"CAD","in_stock":true},{"title":"31mm Round Unmounted","offer_id":44967249084701,"sku":"CT-27050-31D","price":385.0,"currency_code":"CAD","in_stock":true},{"title":"36mm Round Unmounted","offer_id":44967249117469,"sku":"CT-27050-36D","price":483.0,"currency_code":"CAD","in_stock":true},{"title":"2\" Round Mounted","offer_id":44967249150237,"sku":"CT-27050-2M","price":980.0,"currency_code":"CAD","in_stock":true},{"title":"50mm Round Unmounted","offer_id":44967249183005,"sku":"CT-27050-50D","price":910.0,"currency_code":"CAD","in_stock":true},{"title":"50x50mm Square Unmounted","offer_id":44967249215773,"sku":"CT-27050-50X50","price":1015.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Transmission-Curve-of-Chroma-U-Bessel-Filter__84625.1596071523.1280.1280.jpg?v=1684339524"},{"product_id":"chroma-v-bessel-filter","title":"Chroma V-Bessel Filter","description":"\u003c!-- more --\u003e\u003cp\u003eGreen (Visible) photometric filter in UVBRI series\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eFilters designed for use with CCD and for f\/4.0 or slower\u003c\/li\u003e\n\u003cli\u003eNo reflections leading to image distortions or \"\"back reflections\"\"\u003c\/li\u003e\n\u003cli\u003eTransmitted wavefront better than 0.25 waves\/inch\u003c\/li\u003e\n\u003cli\u003eDurable sputter coatings\u003c\/li\u003e\n\u003cli\u003eParallelism: \u0026lt; 30 arcsec\u003c\/li\u003e\n\u003cli\u003eThickness: 3.0 +\/-0.05mm\u003c\/li\u003e\n\u003cli\u003eExtremely durable coatings withstand humidity changes and extreme temperature fluxes and remain spectrally accurate\u003c\/li\u003e\n\u003cli\u003ein CWL and band pass adherence\u003c\/li\u003e\n\u003cli\u003eCapable of manufacturing large filters for large detectors: 50mm x 50mm, 65mm up to 76.2mm and 101.6mm square\u003c\/li\u003e\n\u003cli\u003eAll filters manufactured in Vermont\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eChroma manufactures the highest quality astronomy filters with durable, sputtered hard coatings using single substrates of the best glass, eliminating the need for laminations. All primary filter coatings are applied on the front surface and anti-reflection coatings on the rear surface to prevent ghosting and to maximize transmission.\u003c\/p\u003e\u003cp\u003eHighly precise and accurate, the passbands of these filters remain spectrally stable and do not drift in response to extreme temperature fluctuations or changes in humidity. All filters may be used with apertures of f\/4 or smaller. They provide custom coating services for more demanding imaging applications requiring larger apertures such as f\/3 or f\/2. They also can provide larger sizes and unique passbands upon request.\u003c\/p\u003e","brand":"Chroma","offers":[{"title":"1.25\" Round Mounted","offer_id":44967249281309,"sku":"CT-27051-1.25M","price":385.0,"currency_code":"CAD","in_stock":true},{"title":"31mm Round Unmounted","offer_id":44967249314077,"sku":"CT-27051-31D","price":385.0,"currency_code":"CAD","in_stock":true},{"title":"36mm Round Unmounted","offer_id":44967249346845,"sku":"CT-27051-36D","price":483.0,"currency_code":"CAD","in_stock":true},{"title":"2\" Round Mounted","offer_id":44967249379613,"sku":"CT-27051-2M","price":980.0,"currency_code":"CAD","in_stock":true},{"title":"50mm Round Unmounted","offer_id":44967249412381,"sku":"CT-27051-50D","price":910.0,"currency_code":"CAD","in_stock":true},{"title":"50x50mm Square Unmounted","offer_id":44967249445149,"sku":"CT-27051-50X50","price":1015.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Transmission-Curve-of-Chroma-V-Bessel-Filter__56381.1596071524.1280.1280.jpg?v=1684339526"},{"product_id":"chroma-b-bessel-filter","title":"Chroma B-Bessel Filter","description":"\u003c!-- more --\u003e\u003cp\u003eBlue photometric filter in UVBRI series\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eFilters designed for use with CCD and for f\/4.0 or slower\u003c\/li\u003e\n\u003cli\u003eNo reflections leading to image distortions or \"\"back reflections\"\"\u003c\/li\u003e\n\u003cli\u003eTransmitted wavefront better than 0.25 waves\/inch\u003c\/li\u003e\n\u003cli\u003eDurable sputter coatings\u003c\/li\u003e\n\u003cli\u003eParallelism: \u0026lt; 30 arcsec\u003c\/li\u003e\n\u003cli\u003eThickness: 3.0 +\/-0.05mm\u003c\/li\u003e\n\u003cli\u003eExtremely durable coatings withstand humidity changes and extreme temperature fluxes and remain spectrally accurate\u003c\/li\u003e\n\u003cli\u003ein CWL and band pass adherence\u003c\/li\u003e\n\u003cli\u003eCapable of manufacturing large filters for large detectors: 50mm x 50mm, 65mm up to 76.2mm and 101.6mm square\u003c\/li\u003e\n\u003cli\u003eAll filters manufactured in Vermont\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eChroma manufactures the highest quality astronomy filters with durable, sputtered hard coatings using single substrates of the best glass, eliminating the need for laminations. All primary filter coatings are applied on the front surface and anti-reflection coatings on the rear surface to prevent ghosting and to maximize transmission.\u003c\/p\u003e\u003cp\u003eHighly precise and accurate, the passbands of these filters remain spectrally stable and do not drift in response to extreme temperature fluctuations or changes in humidity. All filters may be used with apertures of f\/4 or smaller. They provide custom coating services for more demanding imaging applications requiring larger apertures such as f\/3 or f\/2. They also can provide larger sizes and unique passbands upon request.\u003c\/p\u003e","brand":"Chroma","offers":[{"title":"1.25\" Round Mounted","offer_id":44967249510685,"sku":"CT-27052-1.25M","price":385.0,"currency_code":"CAD","in_stock":true},{"title":"31mm Round Unmounted","offer_id":44967249543453,"sku":"CT-27052-31D","price":385.0,"currency_code":"CAD","in_stock":true},{"title":"36mm Round Unmounted","offer_id":44967249576221,"sku":"CT-27052-36D","price":483.0,"currency_code":"CAD","in_stock":true},{"title":"2\" Round Mounted","offer_id":44967249608989,"sku":"CT-27052-2M","price":980.0,"currency_code":"CAD","in_stock":true},{"title":"50mm Round Unmounted","offer_id":44967249641757,"sku":"CT-27052-50D","price":910.0,"currency_code":"CAD","in_stock":true},{"title":"50x50mm Square Unmounted","offer_id":44967249674525,"sku":"CT-27052-50X50","price":1015.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Transmission-Curve-of-Chroma-B-Bessel-Filter__40887.1596071525.1280.1280.jpg?v=1684339528"},{"product_id":"chroma-r-bessel-filter","title":"Chroma R-Bessel Filter","description":"\u003c!-- more --\u003e\u003cp\u003eRed photometric filter in UVBRI series\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eFilters designed for use with CCD and for f\/4.0 or slower\u003c\/li\u003e\n\u003cli\u003eNo reflections leading to image distortions or \"\"back reflections\"\"\u003c\/li\u003e\n\u003cli\u003eTransmitted wavefront better than 0.25 waves\/inch\u003c\/li\u003e\n\u003cli\u003eDurable sputter coatings\u003c\/li\u003e\n\u003cli\u003eParallelism: \u0026lt; 30 arcsec\u003c\/li\u003e\n\u003cli\u003eThickness: 3.0 +\/-0.05mm\u003c\/li\u003e\n\u003cli\u003eExtremely durable coatings withstand humidity changes and extreme temperature fluxes and remain spectrally accurate\u003c\/li\u003e\n\u003cli\u003ein CWL and band pass adherence\u003c\/li\u003e\n\u003cli\u003eCapable of manufacturing large filters for large detectors: 50mm x 50mm, 65mm up to 76.2mm and 101.6mm square\u003c\/li\u003e\n\u003cli\u003eAll filters manufactured in Vermont\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eChroma manufactures the highest quality astronomy filters with durable, sputtered hard coatings using single substrates of the best glass, eliminating the need for laminations. All primary filter coatings are applied on the front surface and anti-reflection coatings on the rear surface to prevent ghosting and to maximize transmission.\u003c\/p\u003e\u003cp\u003eHighly precise and accurate, the passbands of these filters remain spectrally stable and do not drift in response to extreme temperature fluctuations or changes in humidity. All filters may be used with apertures of f\/4 or smaller. They provide custom coating services for more demanding imaging applications requiring larger apertures such as f\/3 or f\/2. They also can provide larger sizes and unique passbands upon request.\u003c\/p\u003e","brand":"Chroma","offers":[{"title":"1.25\" Round Mounted","offer_id":44967249740061,"sku":"CT-27053-1.25M","price":385.0,"currency_code":"CAD","in_stock":true},{"title":"31mm Round Unmounted","offer_id":44967249772829,"sku":"CT-27053-31D","price":385.0,"currency_code":"CAD","in_stock":true},{"title":"36mm Round Unmounted","offer_id":44967249805597,"sku":"CT-27053-36D","price":483.0,"currency_code":"CAD","in_stock":true},{"title":"2\" Round Mounted","offer_id":44967249838365,"sku":"CT-27053-2M","price":980.0,"currency_code":"CAD","in_stock":true},{"title":"50mm Round Unmounted","offer_id":44967249871133,"sku":"CT-27053-50D","price":910.0,"currency_code":"CAD","in_stock":true},{"title":"50x50mm Square Unmounted","offer_id":44967249903901,"sku":"CT-27053-50X50","price":1015.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Transmission-Curve-of-Chroma-R-Bessel-Filter__30129.1596071526.1280.1280.jpg?v=1684339726"},{"product_id":"chroma-i-bessel-filter","title":"Chroma I-Bessel Filter","description":"\u003c!-- more --\u003e\u003cp\u003eNIR photometric filter in UVBRI series\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eFilters designed for use with CCD and for f\/4.0 or slower\u003c\/li\u003e\n\u003cli\u003eNo reflections leading to image distortions or \"\"back reflections\"\"\u003c\/li\u003e\n\u003cli\u003eTransmitted wavefront better than 0.25 waves\/inch\u003c\/li\u003e\n\u003cli\u003eDurable sputter coatings\u003c\/li\u003e\n\u003cli\u003eParallelism: \u0026lt; 30 arcsec\u003c\/li\u003e\n\u003cli\u003eThickness: 3.0 +\/-0.05mm\u003c\/li\u003e\n\u003cli\u003eExtremely durable coatings withstand humidity changes and extreme temperature fluxes and remain spectrally accurate\u003c\/li\u003e\n\u003cli\u003ein CWL and band pass adherence\u003c\/li\u003e\n\u003cli\u003eCapable of manufacturing large filters for large detectors: 50mm x 50mm, 65mm up to 76.2mm and 101.6mm square\u003c\/li\u003e\n\u003cli\u003eAll filters manufactured in Vermont\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eChroma manufactures the highest quality astronomy filters with durable, sputtered hard coatings using single substrates of the best glass, eliminating the need for laminations. All primary filter coatings are applied on the front surface and anti-reflection coatings on the rear surface to prevent ghosting and to maximize transmission.\u003c\/p\u003e\u003cp\u003eHighly precise and accurate, the passbands of these filters remain spectrally stable and do not drift in response to extreme temperature fluctuations or changes in humidity. All filters may be used with apertures of f\/4 or smaller. They provide custom coating services for more demanding imaging applications requiring larger apertures such as f\/3 or f\/2. They also can provide larger sizes and unique passbands upon request.\u003c\/p\u003e","brand":"Chroma","offers":[{"title":"1.25\" Round Mounted","offer_id":44967250034973,"sku":"CT-27054-1.25M","price":385.0,"currency_code":"CAD","in_stock":true},{"title":"31mm Round Unmounted","offer_id":44967250067741,"sku":"CT-27054-31D","price":385.0,"currency_code":"CAD","in_stock":true},{"title":"36mm Round Unmounted","offer_id":44967250100509,"sku":"CT-27054-36D","price":483.0,"currency_code":"CAD","in_stock":true},{"title":"2\" Round Mounted","offer_id":44967250133277,"sku":"CT-27054-2M","price":980.0,"currency_code":"CAD","in_stock":true},{"title":"50mm Round Unmounted","offer_id":44967250166045,"sku":"CT-27054-50D","price":910.0,"currency_code":"CAD","in_stock":true},{"title":"50x50mm Square Unmounted","offer_id":44967250198813,"sku":"CT-27054-50X50","price":1015.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Transmission-Curve-of-Chroma-I-Bessel-Filter__54362.1596071527.1280.1280.jpg?v=1684339728"},{"product_id":"chroma-ubvri-filter-set","title":"Chroma UBVRI Filter Set","description":"\u003c!-- more --\u003e\u003cp\u003eUBVRI filter set for photometric imaging\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eFilters designed for use with CCD and for f\/4.0 or slower\u003c\/li\u003e\n\u003cli\u003eNo reflections leading to image distortions or \"\"back reflections\"\"\u003c\/li\u003e\n\u003cli\u003eTransmitted wavefront better than 0.25 waves\/inch\u003c\/li\u003e\n\u003cli\u003eDurable sputter coatings\u003c\/li\u003e\n\u003cli\u003eParallelism: \u0026lt; 30 arcsec\u003c\/li\u003e\n\u003cli\u003eThickness: 3.0 +\/-0.05mm\u003c\/li\u003e\n\u003cli\u003eExtremely durable coatings withstand humidity changes and extreme temperature fluxes and remain spectrally accurate\u003c\/li\u003e\n\u003cli\u003ein CWL and band pass adherence\u003c\/li\u003e\n\u003cli\u003eCapable of manufacturing large filters for large detectors: 50mm x 50mm, 65mm up to 76.2mm and 101.6mm square\u003c\/li\u003e\n\u003cli\u003eAll filters manufactured in Vermont\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eChroma manufactures the highest quality astronomy filters with durable, sputtered hard coatings using single substrates of the best glass, eliminating the need for laminations. All primary filter coatings are applied on the front surface and anti-reflection coatings on the rear surface to prevent ghosting and to maximize transmission.\u003c\/p\u003e\u003cp\u003eHighly precise and accurate, the passbands of these filters remain spectrally stable and do not drift in response to extreme temperature fluctuations or changes in humidity. All filters may be used with apertures of f\/4 or smaller. They provide custom coating services for more demanding imaging applications requiring larger apertures such as f\/3 or f\/2. They also can provide larger sizes and unique passbands upon request.\u003c\/p\u003e","brand":"Chroma","offers":[{"title":"1.25\" Round Mounted","offer_id":44967250264349,"sku":"CT-27103-1.25M","price":1645.0,"currency_code":"CAD","in_stock":true},{"title":"31mm Round Unmounted","offer_id":44967250297117,"sku":"CT-27103-31D","price":2275.0,"currency_code":"CAD","in_stock":true},{"title":"36mm Round Unmounted","offer_id":44967250329885,"sku":"CT-27103-36D","price":2415.0,"currency_code":"CAD","in_stock":true},{"title":"2\" Round Mounted","offer_id":44967250362653,"sku":"CT-27103-2M","price":4620.0,"currency_code":"CAD","in_stock":true},{"title":"50mm Round Unmounted","offer_id":44967250395421,"sku":"CT-27103-50D","price":4270.0,"currency_code":"CAD","in_stock":true},{"title":"50x50mm Square Unmounted","offer_id":44967250428189,"sku":"CT-27103-50X50","price":4795.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Transmission-Curve-of-Chroma-Bessel-UBVRI-Filters__13320.1596071528.1280.1280.jpg?v=1684339731"}],"url":"https:\/\/davidastro.com\/collections\/chroma-bessel-ubvri-photometric-filters.oembed","provider":"David Astro","version":"1.0","type":"link"}