{"product_id":"astronomik-sii-12nm-ccd-filter","title":"Astronomik SII 12nm CCD Filter","description":"\u003ch2 data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003eAstronomik SII 12nm CCD Filter\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003eThis SII Filter is suitable for imaging of SII-regions from observation sites with light pollution and from dark sites as well. The contrast between an object glowing at 672nm and the background is increased enormous!\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eDue to the combination of the narrow bandwidth of 12nm and the high transmission of typically 96% the filter gives you an contrast boost, as all unwanted light from other wavelengths than 672nm is blocked form UV up to the IR. This results in an very dark background compared with any filters with a higher bandwidth\u003cbr data-mce-fragment=\"1\"\u003eThe FWHm of 12nm is optimized for typical DSLR cameras with CMOS sensors and CCD cameras with a normal\/high dark current: With these cameras the background signal in images taken from heavily light polluted sites is dominated by the dark current of the sensor, not by fluy coming from light pollution. In this case a further reduction of FWHM does not improve the image, as the background will not get darker. Compared to the 6nm filters you have more stars in the field of view which gives you more guiding stars when working with an integrated\/dual guiding chip!\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003e\u003c\/strong\u003e\u003cstrong data-mce-fragment=\"1\"\u003e\u003c\/strong\u003e \u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003eImaging with Narrowband-Emissionline Filters\u003c\/strong\u003e\u003cbr data-mce-fragment=\"1\"\u003eIf you have to observe from light polluted sites (like most of us...), imaging with Narrowband-Emissionline filters is the best way to take great images, as all kind of light pollution can be blocked very effective! Normaly an H-alpha filter should be your first step into this amazing field of astrophotography! With an Narrowband H-alpha filter you will be able to take deep and contrasty images even wih very heavy light pollution or with the full moon high up in the sky!\u003cbr data-mce-fragment=\"1\"\u003eIf you look at other astrophotos, an H-alpha is the best choice for all nebulas glowing red! An OIII filters expands your imaging possibilities, as you are able to image all greenish\/blueish structures. Planetary nebulas and star forming regions are great targets! The SII filters completes your HSO-set of filters. With these three filters you are able to process your images like the ones from the Hubble space telescope!\u003cbr data-mce-fragment=\"1\"\u003eThe h-beta filter is not available in a 6nm version, as this filter has nearly no meaningfull application. To illustrate this, there are two images shown below: Both were taken with a unmodified Canon 650D. Even as the camera has a sensitivity of less than 10% at H-alpha, there is some signal und structure in the h-alpha image, while you cannot see anything on the image taken with an H-beta filter!\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003eOperation of the filter:\u003c\/strong\u003e\u003cbr data-mce-fragment=\"1\"\u003eThe filter blocks all unwanted light from artifical light-pollution, natural airglow and moonlight. Especially light from High- and Low-Pressure Sodium and mercury lights and all lines of natural airglow are 100% blocked. The filter increases the contrast between the sky-background and objects glowing at the SII line at 672nm.\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003eTips and Hints for more applications:\u003c\/strong\u003e\u003cbr data-mce-fragment=\"1\"\u003eUsing the SII filter together with OIII-CCD and H-alpha-CCD filters you make produce false-color emission line images (HSO) in the same way as the Hubble-Space telescope. This is possible even from heavyly light polluted sites\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003eAlternatives:\u003c\/strong\u003e\u003cbr data-mce-fragment=\"1\"\u003eIf want to image faint objects in starcrowded regions of the milkyway, propably using short focal lengths, the 6nm filter will be the better choice, as the number of stars is reduced by a factor of ~2. You should even take the 6n mversion if you have a camera with a low thermal current or if you have to observe from a really heavily light polluted site.\u003c\/p\u003e\n\u003cdiv style=\"text-align: center;\" data-mce-fragment=\"1\" data-mce-style=\"text-align: center;\"\u003e_________________\u003c\/div\u003e\n\u003cdiv style=\"text-align: center;\" data-mce-style=\"text-align: center;\"\u003e\u003cstrong\u003e\u003cspan\u003eAll  Astronomik Filters are perfect for modern cameras, including both CMOS and CCD based cameras, allowing you to capture the very best images possible with your instruments. Sharpness, contrast and the absence of any reflections is guaranteed.\u003c\/span\u003e\u003c\/strong\u003e\u003c\/div\u003e\n\u003cdiv style=\"text-align: center;\" data-mce-style=\"text-align: center;\"\u003e\n\u003cbr\u003e\u003cstrong\u003e\u003cspan\u003e\u003c\/span\u003e\u003cspan\u003eEach and every Astronomik filter has to pass a complex quality control process before being suitable for delivery to our customers. Each and every emission line filter is measured with a high-end Perkin-Elmer spectral-photometer to make sure that every single filter is up to the specifications published on our website.\u003c\/span\u003e\u003c\/strong\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"text-align: center;\" data-mce-style=\"text-align: center;\"\u003e\u003cstrong\u003e\u003cspan\u003e\u003cbr\u003eOn the back of each filter-box you will find a label that details the precise sensitivity and band pass measurements for that individual filter inside the box: You will see the max transmission and the recommended range of focal ratio were the filter will give you the best performance.\u003c\/span\u003e\u003c\/strong\u003e\u003c\/div\u003e\n\u003cdiv style=\"text-align: center;\" data-mce-fragment=\"1\" data-mce-style=\"text-align: center;\"\u003e_________________\u003c\/div\u003e\n\u003cdiv style=\"text-align: center;\" data-mce-fragment=\"1\" data-mce-style=\"text-align: center;\"\u003e\u003c\/div\u003e\n\u003ch3 style=\"text-align: left;\" data-mce-fragment=\"1\" data-mce-style=\"text-align: left;\"\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003eTechnical data of the filter:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-mce-fragment=\"1\"\u003e\n\u003cli data-mce-fragment=\"1\"\u003eGuaranteed Transmission of more than 90% at both SII lines (671,7nm und 673,0nm)\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003eTypical Transmission of 96% at both SII lines (671,7nm und 673,0nm)\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003eFull-Width-Half Maximum (FWHM): 12nm\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003eperfect blocking of unwanted light from UV up to the IR\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003eparfokal with all Astronomik filters\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003eMFR Coating technique: Usable with all optics up to f\/3\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003eThickness of 1mm\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003eNot sensitive to moisture, scratch resistant, not aging\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003eopticaly polished substrate, striae-free and free of residual stresses\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003eHigh quality storage box\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eIn the Box\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cp\u003eSelected frame size of Astronomik SII 12nm CCD Filter\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cp\u003ePlastic Storage Case\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-mce-fragment=\"1\"\u003e \u003c\/p\u003e\n\u003ch3 role=\"tabpanel\" aria-hidden=\"false\" aria-labelledby=\"tab-title-3\" data-content=\"tab-3\" class=\"tab__content tab.box tab__content--active\" data-mce-fragment=\"1\"\u003e\n\u003cspan data-mce-fragment=\"1\"\u003eManual \u0026amp; Warranty\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e\n\u003c\/h3\u003e\n\u003cp data-mce-fragment=\"1\"\u003eAstronomik\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e10 year warranty\u003c\/p\u003e","brand":"Astronomik","offers":[{"title":"1.25\" (M28.5)","offer_id":52184003772645,"sku":"ebs1787937517700","price":92.87,"currency_code":"USD","in_stock":true},{"title":"2\" (M48)","offer_id":52184003805413,"sku":"egv1787937517701","price":223.54,"currency_code":"USD","in_stock":true},{"title":"Clip-Filter EOS APS-C","offer_id":52184003838181,"sku":"gkr1787937517702","price":141.0,"currency_code":"USD","in_stock":true},{"title":"XT Clip-Filter EOS APS-C","offer_id":52184003870949,"sku":"gal1787937517703","price":142.05,"currency_code":"USD","in_stock":true},{"title":"Clip-Filter EOS XL","offer_id":52184003903717,"sku":"bcx1787937517704","price":247.78,"currency_code":"USD","in_stock":true},{"title":"Clip-Filter EOS R XL","offer_id":52184003936485,"sku":"cvl1787937517705","price":266.52,"currency_code":"USD","in_stock":true},{"title":"Clip-Filter EOS M","offer_id":52184003969253,"sku":"syo1787937517706","price":123.58,"currency_code":"USD","in_stock":true},{"title":"Clip-Filter Sony alpha 7","offer_id":52184004002021,"sku":"vop1787937517707","price":256.53,"currency_code":"USD","in_stock":true},{"title":"Clip-Filter Nikon XL","offer_id":52184004034789,"sku":"npv1787937517708","price":203.22,"currency_code":"USD","in_stock":true},{"title":"Clip-Filter Nikon Z XL","offer_id":52184004067557,"sku":"qcb1787937517709","price":209.88,"currency_code":"USD","in_stock":true},{"title":"Clip-Filter Pentax K-1","offer_id":52184004100325,"sku":"sfl1787937517710","price":209.88,"currency_code":"USD","in_stock":true},{"title":"T-Mount (M42x0.75)","offer_id":52184004133093,"sku":"tzm1787937517711","price":193.09,"currency_code":"USD","in_stock":true},{"title":"SC Rear Cell (2\" \/ 24TPI)","offer_id":52184004165861,"sku":"wqc1787937517712","price":249.3,"currency_code":"USD","in_stock":true},{"title":"31mm","offer_id":52184004198629,"sku":"rok1787937517713","price":101.39,"currency_code":"USD","in_stock":true},{"title":"36mm","offer_id":52184004231397,"sku":"vjg1787937517714","price":135.58,"currency_code":"USD","in_stock":true},{"title":"50mm","offer_id":52184004264165,"sku":"kln1787937517715","price":191.32,"currency_code":"USD","in_stock":true},{"title":"M49","offer_id":52184004296933,"sku":"chl1787937517716","price":222.68,"currency_code":"USD","in_stock":true},{"title":"M52","offer_id":52184004329701,"sku":"hgq1787937517717","price":226.63,"currency_code":"USD","in_stock":true},{"title":"27mm unmounted","offer_id":52184004362469,"sku":"kfz1787937517718","price":85.22,"currency_code":"USD","in_stock":true},{"title":"42mm unmounted","offer_id":52184004395237,"sku":"fgr1787937517701","price":137.54,"currency_code":"USD","in_stock":true},{"title":"50 x 50mm² unmounted","offer_id":52184004428005,"sku":"htw1787937517702","price":266.52,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0748\/4561\/8405\/files\/astronomik-sii-12nm-ccd-filter_1.jpg?v=1787937522","url":"https:\/\/perovia.shop\/products\/astronomik-sii-12nm-ccd-filter","provider":"My Store","version":"1.0","type":"link"}