{"id":29253,"date":"2025-09-22T22:31:38","date_gmt":"2025-09-22T20:31:38","guid":{"rendered":"https:\/\/www.telescoop.nl\/?post_type=product&#038;p=29253"},"modified":"2026-03-24T11:36:26","modified_gmt":"2026-03-24T10:36:26","slug":"bresser-eyepiece-kellner-4mm-125","status":"publish","type":"product","link":"https:\/\/www.telescoop.nl\/en\/bresser-oculair-kellner-4mm-125\/","title":{"rendered":"Bresser Kellner Eyepiece 4mm 1.25\u2033"},"content":{"rendered":"<p class=\"wp-block-paragraph\">Bresser Eyepiece Kellner 4mm 1.25\u2033 is a short focal length eyepiece that allows high magnifications. This can be interesting for trying details on the moon or planets, although the field of view is narrow and the viewing experience is less comfortable than with Pl\u00f6ssl eyepieces. For serious planetary observations, a Pl\u00f6ssl or Orthoscopic eyepiece is usually a better choice.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Observation goals<\/strong><br>Only suitable with good seeing and larger telescopes. Especially useful as an entry-level option for moon and Jupiter.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Specifications<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Focal length: 4 mm<\/li>\n\n\n\n<li>Type: Kellner eyepiece<\/li>\n\n\n\n<li>Barrel size: 1.25\u2033<\/li>\n\n\n\n<li>Field of view: approx. 40\u00b0<\/li>\n\n\n\n<li>Optical design: 3 elements, 2 groups<\/li>\n\n\n\n<li>Coating: Coated<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"<p data-start=\"8882\" data-end=\"9270\">\u00a0<\/p>\n<p data-start=\"8738\" data-end=\"8880\">Bresser Eyepiece Kellner 4mm 1.25\u2033 comes with coated lenses and offers very high magnifications for beginners.<\/p>","protected":false},"featured_media":29255,"comment_status":"open","ping_status":"closed","template":"","meta":{"_acf_changed":false},"product_brand":[128],"product_cat":[3130,589,56],"product_tag":[],"class_list":["post-29253","product","type-product","status-publish","has-post-thumbnail","product_brand-bresser","product_cat-oculairen-standaard-gezichtsveld","product_cat-optische-accessoires-v1","product_cat-telescoop-accessoires","product_shipping_class-licht","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":32361,"url":"https:\/\/www.telescoop.nl\/en\/bresser-kellner-oculair-10mm-1-25-inch\/","url_meta":{"origin":29253,"position":0},"title":"Bresser Kellner eyepiece 10mm 1.25 inches","author":"","date":"02-11-2025","format":false,"excerpt":"Bresser Eyepiece Kellner 10mm comes with 1.25\" connection, triple lens construction, rubber eyecup and filter thread - ideal for higher magnifications when observing moon and planets with correction of color errors and clear image.","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":32346,"url":"https:\/\/www.telescoop.nl\/en\/bresser-kellner-oculair-20mm-1-25-inch\/","url_meta":{"origin":29253,"position":1},"title":"Bresser Kellner eyepiece 20mm 1.25 inches","author":"","date":"02-11-2025","format":false,"excerpt":"Bresser Ocular Kellner 20mm comes with 1.25\" connection, triple lens construction, folding eyecup and filter thread - ideal for affordable and bright lunar, planetary and deep-sky observations.","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":29938,"url":"https:\/\/www.telescoop.nl\/en\/celestron-omni-oculair-4mm-1-25-inch\/","url_meta":{"origin":29253,"position":2},"title":"Celestron Omni eyepiece 4mm 1.25 inches","author":"","date":"30-09-2025","format":false,"excerpt":"Celestron Omni 4mm 1.25\" Eyepiece comes with fully multi-coated optics and high magnifications for planets. \u00a0","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"Celestron Omni 4 mm Oculair 1,25\"","src":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/09\/Celestron-Oculair-OMNI-4mm-1-25-.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/09\/Celestron-Oculair-OMNI-4mm-1-25-.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/09\/Celestron-Oculair-OMNI-4mm-1-25-.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/09\/Celestron-Oculair-OMNI-4mm-1-25-.jpg?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/09\/Celestron-Oculair-OMNI-4mm-1-25-.jpg?resize=1050%2C600&ssl=1 3x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/09\/Celestron-Oculair-OMNI-4mm-1-25-.jpg?resize=1400%2C800&ssl=1 4x"},"classes":[]},{"id":16015,"url":"https:\/\/www.telescoop.nl\/en\/omegon-super-plossl-planetenoculair-10-mm-125-inch\/","url_meta":{"origin":29253,"position":3},"title":"Omegon Super Pl\u00f6ssl Planetary eyepiece 10 mm 1.25 inches","author":"","date":"18-07-2025","format":false,"excerpt":"The Omegon Super Pl\u00f6ssl 10mm 1.25\" Planetenoculair provides bright views of planets and the Moon with a wide field of view and high contrast.","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"Omegon Super Pl\u00f6ssl Planetenokular 10 mm 1,25 Zoll","src":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/07\/Omegon-Super-Ploessl-oculair-10mm-1-25-.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/07\/Omegon-Super-Ploessl-oculair-10mm-1-25-.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/07\/Omegon-Super-Ploessl-oculair-10mm-1-25-.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/07\/Omegon-Super-Ploessl-oculair-10mm-1-25-.jpg?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/07\/Omegon-Super-Ploessl-oculair-10mm-1-25-.jpg?resize=1050%2C600&ssl=1 3x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/07\/Omegon-Super-Ploessl-oculair-10mm-1-25-.jpg?resize=1400%2C800&ssl=1 4x"},"classes":[]},{"id":15976,"url":"https:\/\/www.telescoop.nl\/en\/oculair-cronus-wa-5-mm-125\/","url_meta":{"origin":29253,"position":4},"title":"Omegon Cronus WA 5 mm 1.25\u2033","author":"","date":"17-07-2025","format":false,"excerpt":"Cronus WA 5mm 1.25\" Eyepiece \u2013 comfortable wide-angle eyepiece with a 60\u00b0 field of view and 16mm eye relief, ideal for planets and deep-sky details.","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"Okular Cronus WA 5 mm","src":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/07\/Omegon-Oculair-Cronus-WA-5-mm-1-25-.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/07\/Omegon-Oculair-Cronus-WA-5-mm-1-25-.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/07\/Omegon-Oculair-Cronus-WA-5-mm-1-25-.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/07\/Omegon-Oculair-Cronus-WA-5-mm-1-25-.jpg?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/07\/Omegon-Oculair-Cronus-WA-5-mm-1-25-.jpg?resize=1050%2C600&ssl=1 3x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/07\/Omegon-Oculair-Cronus-WA-5-mm-1-25-.jpg?resize=1400%2C800&ssl=1 4x"},"classes":[]},{"id":29243,"url":"https:\/\/www.telescoop.nl\/en\/bresser-oculair-plossl-pl-5mm-1-25\/","url_meta":{"origin":29253,"position":5},"title":"Bresser Pl\u00f6ssl Eyepiece 5mm 1.25\u2033","author":"Info telescoop","date":"22-09-2025","format":false,"excerpt":"\u00a0 Bresser Oculair Pl\u00f6ssl PL 5mm 1,25\" wordt geleverd met volledig gecoate optiek en biedt scherpe, contrastrijke beelden bij hoge vergrotingen.","rel":"","context":"With 1 comment","block_context":{"text":"With 1 comment","link":"https:\/\/www.telescoop.nl\/en\/bresser-oculair-plossl-pl-5mm-1-25\/#comments"},"img":{"alt_text":"Bresser Oculair Pl\u00f6ssl PL 5mm 1,25\"","src":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/09\/Bresser-Oculair-Ploessl-PL-5mm-1-25-.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/09\/Bresser-Oculair-Ploessl-PL-5mm-1-25-.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/09\/Bresser-Oculair-Ploessl-PL-5mm-1-25-.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/09\/Bresser-Oculair-Ploessl-PL-5mm-1-25-.jpg?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/09\/Bresser-Oculair-Ploessl-PL-5mm-1-25-.jpg?resize=1050%2C600&ssl=1 3x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/09\/Bresser-Oculair-Ploessl-PL-5mm-1-25-.jpg?resize=1400%2C800&ssl=1 4x"},"classes":[]}],"_links":{"self":[{"href":"https:\/\/www.telescoop.nl\/en\/wp-json\/wp\/v2\/product\/29253","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.telescoop.nl\/en\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/www.telescoop.nl\/en\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/www.telescoop.nl\/en\/wp-json\/wp\/v2\/comments?post=29253"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.telescoop.nl\/en\/wp-json\/wp\/v2\/media\/29255"}],"wp:attachment":[{"href":"https:\/\/www.telescoop.nl\/en\/wp-json\/wp\/v2\/media?parent=29253"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/www.telescoop.nl\/en\/wp-json\/wp\/v2\/product_brand?post=29253"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/www.telescoop.nl\/en\/wp-json\/wp\/v2\/product_cat?post=29253"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/www.telescoop.nl\/en\/wp-json\/wp\/v2\/product_tag?post=29253"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}