{"id":113165,"date":"2026-10-09T16:54:10","date_gmt":"2026-10-09T14:54:10","guid":{"rendered":"https:\/\/www.telescoop.nl\/?post_type=product&p=113165"},"modified":"2026-10-13T11:14:23","modified_gmt":"2026-10-13T09:14:23","slug":"e-244f63-legacy-pre-filter-for-8-inch-schmidt-cassegrain-h-alpha-daystar","status":"publish","type":"product","link":"https:\/\/www.telescoop.nl\/en\/erf-voorfilter-e-244f63-voor-8-inch-schmidt-cassegrain-h-alpha-daystar\/","title":{"rendered":"ERF pre-filter E-244F63 for 8 inch Schmidt-Cassegrain, H-alpha | DayStar"},"content":{"rendered":"

If you have an 8-inch Schmidt-Cassegrain telescope and want to view the Sun in H-alpha light, the heat must be kept away from the front of the telescope. The DayStar ERF E-244F63 is designed for this type of telescope. It blocks ultraviolet and infrared light and allows the red light through, where the H-alpha filter works, so there is much less heat going into the tube.<\/p>\n\n\n\n

Think of a Celestron C8 on an AVX mount<\/a> or another 8 inch from our Schmidt-Cassegrain telescopes<\/a>. Check the outer diameter of the front of your tube or mist cap and compare it with the specified size.<\/p>\n\n\n\n

The mount must fit snugly, without gaps where unfiltered sunlight can pass through. An ERF is not a solar filter to look at by itself. Use it only in conjunction with a suitable H-alpha filter and never look at the sun without the full filter setup. Also remove the viewfinder from your telescope or cover it, and focus with a universal solar finder<\/a>.<\/p>","protected":false},"excerpt":{"rendered":"

Pre-filter for an 8-inch Schmidt-Cassegrain that blocks UV and infrared light, so you can view the Sun in H-alpha with that telescope.<\/p>","protected":false},"featured_media":113164,"comment_status":"open","ping_status":"closed","template":"","meta":{"_acf_changed":false},"product_brand":[3282],"product_cat":[56,3178],"product_tag":[],"class_list":["post-113165","product","type-product","status-publish","has-post-thumbnail","product_brand-daystar","product_cat-telescoop-accessoires","product_cat-zonnefilters","first","instock","taxable","shipping-taxable","purchasable","product-type-simple"],"bundled_by":[],"bundle_stock_status":"instock","bundle_stock_quantity":null,"bundle_virtual":false,"bundle_layout":"","bundle_add_to_cart_form_location":"","bundle_editable_in_cart":false,"bundle_sold_individually_context":"","bundle_item_grouping":"","bundle_min_size":"","bundle_max_size":"","bundle_price":[],"bundled_items":[],"bundle_sell_ids":[],"acf":[],"jetpack_sharing_enabled":true,"jetpack-related-posts":[{"id":113185,"url":"https:\/\/www.telescoop.nl\/en\/erf-voorfilter-e-281f80-voor-h-alpha-zonnewaarneming-daystar\/","url_meta":{"origin":113165,"position":0},"title":"ERF pre-filter E-281F80 for H-alpha solar monitoring | DayStar","author":"Info telescoop","date":"09-10-2026","format":false,"excerpt":"Pre-filter in size E-281F80 for H-alpha observation of the sun. It is placed in front of the opening and blocks heat, UV and infrared radiation.","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/10\/74437_1.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/10\/74437_1.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/10\/74437_1.jpg?resize=525%2C300&ssl=1 1.5x"},"classes":[]},{"id":113162,"url":"https:\/\/www.telescoop.nl\/en\/erf-voorfilter-e-170n130-voor-h-alpha-zonnewaarneming-daystar\/","url_meta":{"origin":113165,"position":1},"title":"ERF pre-filter E-170N130 for H-alpha solar monitoring | DayStar","author":"Info telescoop","date":"09-10-2026","format":false,"excerpt":"Energy rejection filter in size E-170N130 for the front of your telescope, so that your H-alpha filter has to process less heat.","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/10\/12827_1.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/10\/12827_1.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/10\/12827_1.jpg?resize=525%2C300&ssl=1 1.5x"},"classes":[]},{"id":113157,"url":"https:\/\/www.telescoop.nl\/en\/erf-voorfilter-e-120n80-voor-h-alpha-zonnewaarneming-daystar\/","url_meta":{"origin":113165,"position":2},"title":"ERF-prefilter E-120N80 for H-alpha solar monitoring | DayStar","author":"Info telescoop","date":"09-10-2026","format":false,"excerpt":"DayStar's E-120N80 pre-filter for H-alpha solar observation, which prevents heat, UV and infrared from entering your telescope before it opens.","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/10\/12827_1.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/10\/12827_1.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/10\/12827_1.jpg?resize=525%2C300&ssl=1 1.5x"},"classes":[]},{"id":113166,"url":"https:\/\/www.telescoop.nl\/en\/erf-voorfilter-e-325f90-voor-h-alpha-zonnewaarneming-daystar\/","url_meta":{"origin":113165,"position":3},"title":"ERF pre-filter E-325F90 for H-alpha solar monitoring | DayStar","author":"Info telescoop","date":"09-10-2026","format":false,"excerpt":"DayStar ERF pre-filter in size E-325F90 for opening your telescope, which keeps heat, UV and infrared out of your H-alpha setup.","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/10\/12827_1.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/10\/12827_1.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/10\/12827_1.jpg?resize=525%2C300&ssl=1 1.5x"},"classes":[]},{"id":113159,"url":"https:\/\/www.telescoop.nl\/en\/erf-voorfilter-e-130n100-voor-h-alpha-zonnewaarneming-daystar\/","url_meta":{"origin":113165,"position":4},"title":"ERF pre-filter E-130N100 for H-alpha solar monitoring | DayStar","author":"Info telescoop","date":"09-10-2026","format":false,"excerpt":"ERF pre-filter in size E-130N100 that comes before your telescope and prevents heat, UV and infrared in an H-alpha configuration.","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/10\/12827_1.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/10\/12827_1.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/10\/12827_1.jpg?resize=525%2C300&ssl=1 1.5x"},"classes":[]},{"id":113184,"url":"https:\/\/www.telescoop.nl\/en\/erf-voorfilter-e-200n150-voor-h-alpha-zonnewaarneming-daystar\/","url_meta":{"origin":113165,"position":5},"title":"ERF-prefilter E-200N150 for H-alpha solar monitoring | DayStar","author":"Info telescoop","date":"09-10-2026","format":false,"excerpt":"ERF for the front of your telescope in size E-200N150. 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