{"id":16762,"date":"2026-09-18T20:08:13","date_gmt":"2026-09-18T18:08:13","guid":{"rendered":"https:\/\/deep-space-astronomy.ch\/?post_type=product&#038;p=16762"},"modified":"2026-10-31T08:48:23","modified_gmt":"2026-10-31T07:48:23","slug":"tele-vue-ethos-sx-3-7-mm","status":"publish","type":"product","link":"https:\/\/deep-space-astronomy.ch\/en\/product\/tele-vue-ethos-sx-3-7-mm\/","title":{"rendered":"Ethos SX 3.7 mm Tele Vue \u2013 110\u00b0 Eyepiece"},"content":{"rendered":"<div class=\"product\"><div class=\"product\"><h3>Ethos SX 3.7 mm Eyepiece: Key Features<\/h3>\n<p>The <strong>Ethos SX 3.7 mm Tele Vue<\/strong> is a 3.7-mm astronomical eyepiece offering an apparent field of <strong>110\u00b0<\/strong>. It has a 2-inch and 1.25-inch slip-on mount and a 15-mm eye relief. This configuration is worth considering for lunar and planetary details and double stars, when the instrument\u2019s diameter and atmospheric turbulence permit.<\/p>\n<h3>What is this model best suited for?<\/h3>\n<p>The Ethos series is designed for observers who want a very wide field of view around the subject. The Ethos SX models offer an apparent field of view of 110\u00b0, compared to 100\u00b0 for the other Ethos models. This apparent field of view should not be confused with the actual field of view visible through your telescope.<\/p>\n<ul>\n<li>Includes a 2-inch screw-on adapter, designed to be parfocal with the 13 mm and 10 mm Ethos eyepieces when used in 2-inch mode.<\/li>\n<\/ul>\n<h3>Technical specifications<\/h3>\n<table style=\"width:100%;border-collapse:collapse\">\n<tbody>\n<tr>\n<th scope=\"row\">Manufacturer reference<\/th>\n<td>ETH-03.7<\/td>\n<\/tr>\n<tr>\n<th scope=\"row\">Family<\/th>\n<td>Ethos SX<\/td>\n<\/tr>\n<tr>\n<th scope=\"row\">Focal length<\/th>\n<td>3.7 mm<\/td>\n<\/tr>\n<tr>\n<th scope=\"row\">Apparent field<\/th>\n<td>110\u00b0<\/td>\n<\/tr>\n<tr>\n<th scope=\"row\">Flow<\/th>\n<td>2 and 1.25 inches<\/td>\n<\/tr>\n<tr>\n<th scope=\"row\">Eye Discharge<\/th>\n<td>15 mm<\/td>\n<\/tr>\n<tr>\n<th scope=\"row\">Field diaphragm<\/th>\n<td>7.04 mm<\/td>\n<\/tr>\n<tr>\n<th scope=\"row\">Weight<\/th>\n<td>1.1 lb \/ 17.6 oz<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3>Frequently asked questions<\/h3>\n<p><strong>What is the magnification with this eyepiece?<\/strong><br \/>With a telescope that has a focal length of 1,000 mm, this eyepiece provides approximately 270\u00d7 magnification. The magnification is calculated by dividing the telescope\u2019s focal length by that of the eyepiece.<\/p>\n<p><strong>Is it compatible with my telescope?<\/strong><br \/>The double slide allows for both of the specified formats. Check the clamping position, the focusing travel, and the clearances with your angle drive or focus adjuster.<\/p>\n<p><strong>Can you observe things with glasses?<\/strong><br \/>The specified eye relief is 15 mm. Comfort when wearing glasses also depends on their shape and the position of the eye; trying them on is always better than relying on a universal guarantee. The Tele Vue chart indicates DIOPTRX compatibility; this astigmatism corrector is optional.<\/p>\n<p><strong>Is the apparent field the field visible in the sky?<\/strong><br \/>No. The apparent field of view of 110\u00b0 describes the view through the eyepiece. The actual field of view depends on the telescope; the field diaphragm of 7.04 mm is the value to use to calculate it.<\/p>\n<h3>Before Ordering<\/h3>\n<p>Check the focus travel, the focus range, the weight your setup can support, and the compatibility of filters or correctors. The product offered is a Tele Vue Ethos SX 3.7 mm eyepiece; the accessories listed are optional. The availability shown reflects our supplier\u2019s status at the time of the last check and does not indicate a reserved quantity.<\/p>\n<p>Features and Compatibility: <a href=\"https:\/\/www.televue.com\/engine\/TV3b_page.asp?ID=20&amp;Tab=EP_ETH-03.7\" target=\"_blank\" rel=\"noopener\">Tele Vue ETH-03.7 Official Product Sheet<\/a>.<\/p>\n<\/div><\/div>","protected":false},"excerpt":{"rendered":"<p>Ethos SX 3.7 mm Tele Vue: focal length 3.7 mm, apparent field of view 110\u00b0, 2-inch and 1.25-inch threads, and 15 mm eye relief. Part number ETH-03.7.<\/p>","protected":false},"featured_media":16761,"comment_status":"open","ping_status":"closed","template":"","meta":[],"product_brand":[629],"product_cat":[695,833,368],"product_tag":[],"class_list":["post-16762","product","type-product","status-publish","has-post-thumbnail","product_brand-televue","product_cat-oculaires-et-smart-oculaires","product_cat-en-stock","product_cat-visuel","first","instock","taxable","shipping-taxable","purchasable","product-type-simple"],"_links":{"self":[{"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/product\/16762","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=16762"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/media\/16761"}],"wp:attachment":[{"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/media?parent=16762"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/product_brand?post=16762"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/product_cat?post=16762"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/deep-space-astronomy.ch\/en\/wp-json\/wp\/v2\/product_tag?post=16762"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}