{"id":16708,"date":"2026-09-18T17:43:05","date_gmt":"2026-09-18T15:43:05","guid":{"rendered":"https:\/\/deep-space-astronomy.ch\/?post_type=product&#038;p=16708"},"modified":"2026-09-24T11:02:13","modified_gmt":"2026-09-24T09:02:13","slug":"daystar-wlf90-filtre-solaire","status":"publish","type":"product","link":"https:\/\/deep-space-astronomy.ch\/en\/product\/daystar-wlf90-filtre-solaire\/","title":{"rendered":"DayStar WLF90 \u2013 SolarLite Solar Filter for 80\u201389 mm Tubes"},"content":{"rendered":"<div class=\"product\"><div class=\"product\"><h3>Observing the Sun in white light<\/h3>\n<p>The <strong>DayStar WLF90<\/strong> is a full-aperture solar filter that combines a film <strong>SolarLite of Thousand Oaks<\/strong> to a metal frame. It is attached to the front of the instrument and is suitable for tubes or anti-fog screens whose <strong>The outer diameter measures between 80 and 89 mm<\/strong>. This mounting size is the first thing to check before choosing a filter.<\/p>\n<p>Designed for observing and imaging the Sun in white light, it renders the solar disk in an orange-yellow hue. Its ND 5 optical density filter blocks 99.999 % of the light, according to the manufacturer\u2019s data. The rigid frame provides support for the film, while three knurled screws made of glass-fiber-reinforced nylon secure the assembly to the instrument.<\/p>\n<h3>Choosing the Right Size<\/h3>\n<p>The designation WLF90 refers to a filter with a 90 mm inner diameter; it does not mean that this filter is suitable for all telescopes with a 90 mm aperture. Measure the outer diameter of the tube, the dew shield, or the objective lens at the point where the filter will be installed. For this model, DayStar specifies a range of 80 to 89 mm.<\/p>\n<ul>\n<li><strong>Front-facing mounting:<\/strong> The filter is placed in front of the instrument's entrance, not on the eyepiece.<\/li>\n<li><strong>Adjustable fastener:<\/strong> The three knurled screws are used to adjust the fit on the compatible tube.<\/li>\n<li><strong>Flexible film:<\/strong> Its slightly wavy appearance is normal; the manufacturer states that these waves do not affect image quality.<\/li>\n<\/ul>\n<h3>Be sure to bring your instrument to the Soleil as well<\/h3>\n<p>The WLF90 allows you to begin solar observation using your existing equipment, provided you have a compatible and secure front mount. It is an affordable solution for tracking the evolution of sunspots and starting to photograph the solar disk.<\/p>\n<p>To explore solar prominences and the chromosphere next, check out the <a href=\"https:\/\/deep-space-astronomy.ch\/en\/product\/daystar-solar-scout-ss60ds\/\">Solar Scout SS60DS H-alpha<\/a>, a pair of specialized solar viewing glasses. The two approaches reveal different phenomena and each requires its own filtration setup. To prepare for a club session or a supervised school activity, <a href=\"https:\/\/deep-space-astronomy.ch\/en\/contact\/\">Contact Deep Space Astronomy<\/a>.<\/p>\n<h3>Precautions and Compatibility<\/h3>\n<p><strong>Solar observation requires a secure setup.<\/strong> Before each use, check the condition of the filter and make sure it is securely attached. Do not use a torn or punctured filter, and never point an unprotected instrument toward the Sun. Follow the manufacturer\u2019s safety instructions.<\/p>\n<p>This white light filter <strong>does not replace an ERF energy rejection filter<\/strong> for a DayStar H-alpha system or a Quark. It also belongs to a different line than the DayStar ULF foldable filters: their dimensions and mounting are not interchangeable.<\/p>\n<h3>Technical specifications<\/h3>\n<div style=\"max-width:100%\">\n<table style=\"width:100%;border-collapse:collapse\">\n<tbody>\n<tr>\n<th scope=\"row\">Brand<\/th>\n<td>DayStar Filters<\/td>\n<\/tr>\n<tr>\n<th scope=\"row\">Manufacturer reference<\/th>\n<td>WLF90<\/td>\n<\/tr>\n<tr>\n<th scope=\"row\">Type<\/th>\n<td>White-light solar filter for the front<\/td>\n<\/tr>\n<tr>\n<th scope=\"row\">Filter material<\/th>\n<td>Thousand Oaks SolarLite Polymer Film<\/td>\n<\/tr>\n<tr>\n<th scope=\"row\">Optical density<\/th>\n<td>ND 5<\/td>\n<\/tr>\n<tr>\n<th scope=\"row\">Announced Light Output<\/th>\n<td>99,999 %<\/td>\n<\/tr>\n<tr>\n<th scope=\"row\">Mount<\/th>\n<td>Metal, nominal inside diameter of 90 mm<\/td>\n<\/tr>\n<tr>\n<th scope=\"row\">Compatible outer diameter<\/th>\n<td>80 to 89 mm<\/td>\n<\/tr>\n<tr>\n<th scope=\"row\">Mounting<\/th>\n<td>Three knurled screws made of glass-fiber-reinforced nylon<\/td>\n<\/tr>\n<tr>\n<th scope=\"row\">Solar Image Tint<\/th>\n<td>Orange-yellow<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<h3>Contents<\/h3>\n<p>A WLF90 solar filter with SolarLite film mounted in its metal housing and secured with three screws. Observation instrument not included.<\/p>\n<p><small>Official promotional photo of the WLF line; the diameter shown may vary.<\/small><\/p>\n<\/div><\/div>","protected":false},"excerpt":{"rendered":"<p>Observe and photograph sunspots using your instrument equipped with this SolarLite ND 5 front filter with a metal frame. For an outer diameter of the tube or dew shield ranging from 80 to 89 mm; ensure the filter is securely attached and check it before each observation session.<\/p>\n<p><strong>Available by special order \u2014 2-week lead time<\/strong><\/p>","protected":false},"featured_media":16712,"comment_status":"open","ping_status":"closed","template":"","meta":[],"product_brand":[834],"product_cat":[645,642],"product_tag":[],"class_list":["post-16708","product","type-product","status-publish","has-post-thumbnail","product_brand-daystar","product_cat-filtres-solaires","product_cat-materiel-pour-lobservation-solaire","first","on_supplier","taxable","shipping-taxable","purchasable","product-type-simple"],"_links":{"self":[{"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/product\/16708","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/comments?post=16708"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/media\/16712"}],"wp:attachment":[{"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/media?parent=16708"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/product_brand?post=16708"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/product_cat?post=16708"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/product_tag?post=16708"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}