{"id":32346,"date":"2025-11-02T13:00:55","date_gmt":"2025-11-02T12:00:55","guid":{"rendered":"https:\/\/www.telescoop.nl\/?post_type=product&p=32346"},"modified":"2026-03-13T10:01:14","modified_gmt":"2026-03-13T09:01:14","slug":"bresser-kellner-eyepiece-20mm-1-25-inches","status":"publish","type":"product","link":"https:\/\/staging.telescoop.nl\/en\/bresser-kellner-oculair-20mm-1-25-inch\/","title":{"rendered":"Bresser Kellner eyepiece 20mm 1.25 inches"},"content":{"rendered":"

Bresser Eyepiece Kellner 20mm - Clear vision with classic design<\/strong><\/p>\n\n\n\n

The Bresser Eyepiece Kellner 20mm<\/strong> is an excellent choice if you want to get more out of your telescope without paying too much. This eyepiece is designed with three carefully positioned lenses that combine to provide a clear, sharp image - perfect for moon, planets and bright deep-sky objects.<\/p>\n\n\n\n

\"Bresser<\/figure>\n\n\n\n

Sharp images and comfortable viewing<\/strong>
Thanks to its simple yet effective design, this Kellner eyepiece delivers high-contrast images. Color errors are kept to a minimum, so you see bright and natural colors. The 20mm focal length offers a nice balance of magnification and overview, ideal for beginners or as an addition to your existing set.<\/p>\n\n\n\n

Built for quality and durability<\/strong>
The sturdy aluminum body feels rugged and comfortable to hold. A folding eyecup blocks stray light so you can observe in a more relaxed manner for longer. In addition, the eyepiece features a filter thread - handy when you want to use additional filters for moon or planetary observation.<\/p>\n\n\n\n

\"Bresser<\/figure>\n\n\n\n

Compatible with most telescopes<\/strong>
With a standard 1.25\u2033 connection, the Bresser Kellner 20mm fits virtually any telescope. This way you expand your observing capabilities effortlessly, whether you use a refractor or reflector.<\/p>\n\n\n\n

What to expect<\/h3>\n\n\n\n

\u2713 Moon: sharp edges, craters and shadows
\u2713 Planets: clear cloud bands on Jupiter and rings of Saturn
\u2713 Deep-sky: clear view of open clusters and nebulae
\u2713 Ease of use: light, comfortable and easy to assemble
\u2717 Less suitable for extremely fast telescopes (below f\/5)<\/p>\n\n\n\n

Specifications<\/h3>\n\n\n\n

Optics<\/strong><\/p>\n\n\n\n

Feature<\/th>Description<\/th><\/tr><\/thead>
Design<\/td>Kellner<\/td><\/tr>
Type<\/td>Ocular<\/td><\/tr>
Focal length (mm)<\/td>20<\/td><\/tr>
Number of lenses<\/td>3<\/td><\/tr>
Field of view (\u00b0)<\/td>45<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

Mechanical<\/strong><\/p>\n\n\n\n

Feature<\/th>Description<\/th><\/tr><\/thead>
Telescope connection<\/td>1,25\u2033<\/td><\/tr>
Housing material<\/td>Aluminum<\/td><\/tr>
Length (mm)<\/td>60<\/td><\/tr>
Diameter (mm)<\/td>33<\/td><\/tr>
Weight (g)<\/td>100<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

Details<\/strong><\/p>\n\n\n\n

Feature<\/th>Description<\/th><\/tr><\/thead>
Adjustable eye cup<\/td>Yes (foldable)<\/td><\/tr>
Filter thread<\/td>Yes<\/td><\/tr>
Lighting<\/td>No<\/td><\/tr><\/tbody><\/table><\/figure>","protected":false},"excerpt":{"rendered":"

Bresser Ocular Kellner 20mm comes with 1.25\u2033 connector, triple lens assembly, folding eyecup and filter thread - ideal for affordable and bright lunar, planetary and deep-sky observations.<\/p>","protected":false},"featured_media":96605,"comment_status":"open","ping_status":"closed","template":"","meta":{"_acf_changed":false},"product_brand":[128],"product_cat":[56,589,3130],"product_tag":[],"class_list":["post-32346","product","type-product","status-publish","has-post-thumbnail","product_brand-bresser","product_cat-telescoop-accessoires","product_cat-optische-accessoires-v1","product_cat-oculairen-standaard-gezichtsveld","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:\/\/staging.telescoop.nl\/en\/bresser-kellner-oculair-10mm-1-25-inch\/","url_meta":{"origin":32346,"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":"https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/11\/Bresser-Oculair-Kellner-10mm-125-1.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/11\/Bresser-Oculair-Kellner-10mm-125-1.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/11\/Bresser-Oculair-Kellner-10mm-125-1.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/11\/Bresser-Oculair-Kellner-10mm-125-1.jpg?resize=700%2C400&ssl=1 2x"},"classes":[]},{"id":32310,"url":"https:\/\/staging.telescoop.nl\/en\/bresser-plossl-oculair-20mm-1-25-inch\/","url_meta":{"origin":32346,"position":1},"title":"Bresser Pl\u00f6ssl Eyepiece 20mm 1.25 inches","author":"","date":"02-11-2025","format":false,"excerpt":"Bresser Eyepiece Pl\u00f6ssl PL 20mm comes with multiple coating, collapsible rubber eyecup and 1.25\" connection - ideal for bright and high-contrast observations of star clusters, nebulae, moon and planets.","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/11\/Bresser-Oculair-Plossl-PL-20mm-125.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/11\/Bresser-Oculair-Plossl-PL-20mm-125.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/11\/Bresser-Oculair-Plossl-PL-20mm-125.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/11\/Bresser-Oculair-Plossl-PL-20mm-125.jpg?resize=700%2C400&ssl=1 2x"},"classes":[]},{"id":29253,"url":"https:\/\/staging.telescoop.nl\/en\/bresser-oculair-kellner-4mm-125\/","url_meta":{"origin":32346,"position":2},"title":"Bresser Kellner Eyepiece 4mm 1.25\u2033","author":"","date":"22-09-2025","format":false,"excerpt":"\u00a0 Bresser Oculair Kellner 4mm 1,25\" wordt geleverd met gecoate lenzen en biedt zeer hoge vergrotingen voor beginners.","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"Bresser Oculair Kellner 4mm 1,25\"","src":"https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/09\/Bresser-Oculair-Kellner-4mm-1-25-.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/09\/Bresser-Oculair-Kellner-4mm-1-25-.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/09\/Bresser-Oculair-Kellner-4mm-1-25-.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/09\/Bresser-Oculair-Kellner-4mm-1-25-.jpg?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/09\/Bresser-Oculair-Kellner-4mm-1-25-.jpg?resize=1050%2C600&ssl=1 3x, https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/09\/Bresser-Oculair-Kellner-4mm-1-25-.jpg?resize=1400%2C800&ssl=1 4x"},"classes":[]},{"id":31911,"url":"https:\/\/staging.telescoop.nl\/en\/bresser-90-900-refractor-az-eq-taurus\/","url_meta":{"origin":32346,"position":3},"title":"Bresser 90\/900 Refractor AZ-EQ Taurus","author":"","date":"01-11-2025","format":false,"excerpt":"Bresser AC 90\/900 comes with AZ-EQ mount, aluminum tripod, red dot viewfinder, 4mm and 20mm eyepieces, 3x Barlow lens, 90\u00b0 star prism, solar filter and smartphone adapter - ideal for beginners who want to safely observe the moon, planets, galaxies AND the sun.","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/11\/Bresser-AC-90-900-Telescoop-AZ-EQ-Taurus-1.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/11\/Bresser-AC-90-900-Telescoop-AZ-EQ-Taurus-1.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/11\/Bresser-AC-90-900-Telescoop-AZ-EQ-Taurus-1.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/11\/Bresser-AC-90-900-Telescoop-AZ-EQ-Taurus-1.jpg?resize=700%2C400&ssl=1 2x"},"classes":[]},{"id":92453,"url":"https:\/\/staging.telescoop.nl\/en\/omegon-20mm-oculair-super-plossl-1-25-inch\/","url_meta":{"origin":32346,"position":4},"title":"Omegon 20mm Eyepiece Super Pl\u00f6ssl (1.25 inches)","author":"","date":"05-01-2026","format":false,"excerpt":"Omegon Super Pl\u00f6ssl eyepiece, 20mm, 1.25'' comes with multicoated 5-lens optics, rubber eyecup, 1.25\" mount and 52\u00b0 field of view - ideal for any telescope enthusiast looking for clear image, sharp contrast and wide field of view for both bright and faint objects.","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2026\/01\/Omegon-Super-Ploessl-oculair-20mm-1-25-2.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2026\/01\/Omegon-Super-Ploessl-oculair-20mm-1-25-2.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2026\/01\/Omegon-Super-Ploessl-oculair-20mm-1-25-2.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2026\/01\/Omegon-Super-Ploessl-oculair-20mm-1-25-2.jpg?resize=700%2C400&ssl=1 2x"},"classes":[]},{"id":31979,"url":"https:\/\/staging.telescoop.nl\/en\/bresser-sirius-ac-70-900-az-1\/","url_meta":{"origin":32346,"position":5},"title":"Bresser Sirius AC 70\/900 AZ-1 Sirius","author":"","date":"01-11-2025","format":false,"excerpt":"Bresser AC 70\/900 AZ-1 comes with AZ-1 mount, aluminum tripod, 4mm and 20mm eyepieces, 3x Barlow lens, red dot finder, 90\u00b0 star prism, solar filter and smartphone adapter - ideal for beginners who want to observe the moon, planets and even the sun.","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/11\/Bresser-AC-70-900-AZ-1-Telescoop-Sirius-1.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/11\/Bresser-AC-70-900-AZ-1-Telescoop-Sirius-1.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/11\/Bresser-AC-70-900-AZ-1-Telescoop-Sirius-1.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/11\/Bresser-AC-70-900-AZ-1-Telescoop-Sirius-1.jpg?resize=700%2C400&ssl=1 2x"},"classes":[]}],"_links":{"self":[{"href":"https:\/\/staging.telescoop.nl\/en\/wp-json\/wp\/v2\/product\/32346","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/staging.telescoop.nl\/en\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/staging.telescoop.nl\/en\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/staging.telescoop.nl\/en\/wp-json\/wp\/v2\/comments?post=32346"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/staging.telescoop.nl\/en\/wp-json\/wp\/v2\/media\/96605"}],"wp:attachment":[{"href":"https:\/\/staging.telescoop.nl\/en\/wp-json\/wp\/v2\/media?parent=32346"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/staging.telescoop.nl\/en\/wp-json\/wp\/v2\/product_brand?post=32346"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/staging.telescoop.nl\/en\/wp-json\/wp\/v2\/product_cat?post=32346"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/staging.telescoop.nl\/en\/wp-json\/wp\/v2\/product_tag?post=32346"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}