{"id":15902,"date":"2025-07-29T07:00:00","date_gmt":"2025-07-29T05:00:00","guid":{"rendered":"https:\/\/www.telescoop.nl\/?p=15902"},"modified":"2025-11-27T19:26:20","modified_gmt":"2025-11-27T18:26:20","slug":"telescope-collimation-this-is-how-to-adjust-your-reflector-in-focus","status":"publish","type":"post","link":"https:\/\/staging.telescoop.nl\/en\/telescoop-collimatie-zo-stel-je-je-reflector-scherp-af\/","title":{"rendered":"Telescope collimation: this is how to adjust your reflector in focus"},"content":{"rendered":"<p class=\"wp-block-paragraph\">Telescope collimation is the adjustment of the mirrors in a Newton or Dobson telescope so that the image is razor sharp. Without collimation, your telescope will not operate at full power. Fortunately, it doesn't have to be difficult: with the right tools, it can be done in minutes, even for beginners.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">What is telescope collimation?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">In a reflector telescope, everything works with mirrors:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>The <strong>primary mirror<\/strong> captures the light at the bottom of the tube<\/li>\n\n\n\n<li>The <strong>secondary mirror<\/strong> sends it to the eyepiece<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">If those mirrors are not perfectly matched, you see: <br>\u2717 Blurry images<br>\u2717 Poor contrast<br>\u2717 Distorted stars or rings<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Collimation ensures that everything is optically aligned. It is essential for planetary detail, sharpness in deep-sky objects and good astrophotos.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Is collimation complicated?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">No. As long as you use good tools, it's actually easy AND fast. Most problems arise when people try it with the naked eye or with a plastic cap. We advise against that. Rather use one of these two:<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">1. Collimating with a Cheshire<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">A <strong>Cheshire eyepiece<\/strong> is a handy little metal tube that you plug into the eyepiece mount. You look through it and immediately see if your mirrors are in the right position. Ideal for beginners and advanced users.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Advantages: <br>\u2713 No batteries required<br>\u2713 Simple visual inspection<br>\u2713 Suitable for f\/6 to f\/8 telescopes (standard with Dobsons)<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">You adjust the secondary mirror first (center it under the eyepiece), and then the primary mirror (so that the mirror clips are nicely symmetrical). A Cheshire makes that clear.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">2. Collimating with a laser<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Want it even faster, or do you have a fast telescope (f\/4 - f\/5)? Then a <strong>laser collimator<\/strong> the best choice. You insert the laser into the eyepiece mount, and adjust the mirrors so that the laser returns exactly to its starting point.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2705 Raging control<br>\u2705 Also usable in the dark<br>\u2705 Perfect for those who want maximum sharpness of image<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Recommended:<\/strong> the <a href=\"https:\/\/staging.telescoop.nl\/en\/hotech-sca-laser-collimator-125-2-point-laser\/\">HoTech SCA laser collimator<\/a>. It automatically clamps itself without backlash, so it is always exactly centered. This makes it more reliable than cheaper lasers.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">This is how to collimate your telescope with a laser, step by step<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>1. Set up your telescope stably<\/strong><br>Make sure the tube is upright or slightly inclined, with a good view of the main mirror. Put it on a solid surface.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>2. Place the laser collimator in the eyepiece holder.<\/strong><br>Use a self-centering laser (such as the HoTech) so that it is perfectly centered - this prevents erroneous measurements.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>3. Aim the laser at the primary mirror<\/strong><br>You will see a little red dot appear on the main mirror. In the center of that mirror is a small ring (the collimation ring).<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2192 <strong>Target<\/strong>: bring the laser beam exactly to the center of that ring.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>4. Adjust the secondary mirror<\/strong><br>Use the Allen screws on the spider (the holder of the small mirror). Turn carefully until the laser passes exactly through the center of the main mirror.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>5. Now look at the return image on the laser itself<\/strong><br>The laser beam reflects back to the laser through the main mirror.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2192 <strong>Target<\/strong>: the returning dot should coincide exactly with the starting point on the laser.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>6. Adjust the primary mirror<\/strong><br>Use the collimation knobs on the back of the telescope to tilt the mirror very slightly. Rotate until the dot exactly coincides with the return point on the laser.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>7. Ready? Check everything one more time.<\/strong><br>Move the tube up and down a little. If the laser dot does not move, everything is properly aligned.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Which tool suits you?<\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><th>Tool<\/th><th>For whom<\/th><th>Features<\/th><\/tr><tr><td>Cheshire<\/td><td>Beginners &amp; advanced students<\/td><td>Simple, passive, always reliable<\/td><\/tr><tr><td>HoTech laser<\/td><td>Everyone<\/td><td>Fast, precise, even with fast telescopes<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Do you use both? Then you always have a double check. Many avid users start with a laser and check with a Cheshire.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Tips for perfect results<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u2713 Let your telescope cool outside for 30 minutes<br>\u2713 Put it steady before you start<br>\u2713 Always start with the <strong>secondary mirror<\/strong> (small, diagonal)<br>\u2713 Then set the <strong>primary mirror<\/strong> off (large buttons at the bottom)<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Why is collimation so important?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u2713 <strong>Planets<\/strong>: details such as cloud bands on Jupiter or the <a href=\"https:\/\/science.nasa.gov\/mission\/cassini\/\" target=\"_blank\" rel=\"noopener\">Cassini<\/a>-separation in Saturn become much clearer <br>\u2713 <strong>Deep-sky objects<\/strong>: star clusters, nebulae and galaxies remain sharp to the edge <br>\u2713 <strong>Astrophotography<\/strong>: sharpness and contrast improve visibly<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A poorly collimated telescope delivers only a fraction of the performance you paid for. And that's a shame, especially when collimation is so easy.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Conclusion: telescope collimation is easy with the right tool<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Telescope collimation doesn't have to be a hassle. With a Cheshire or a HoTech laser, you can have your telescope perfectly aligned again within 5 minutes. And you notice it immediately in the image. No more blurry edges, no more frustration, just sharp vision on planets, the moon and deep-sky objects.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u2192 Want to know more?<\/strong> View our <a href=\"https:\/\/staging.telescoop.nl\/en\/telescopes\/telescope-accessories\/maintenance-protection\/?filtering=1&amp;filter_product_brand=636\">Collimation tools and accessories on Telescope.co.uk<\/a> and find out what suits your telescope best.<\/p>","protected":false},"excerpt":{"rendered":"<p>Telescoop collimatie is het afstellen van de spiegels in een Newton- of Dobson-telescoop, zodat het beeld haarscherp is. Zonder collimatie werkt je telescoop niet op volle kracht. Gelukkig hoeft het niet moeilijk te zijn: met de juiste tools is het binnen een paar minuten geregeld, ook voor beginners. Wat is telescoop collimatie? In een reflector [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":15733,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[168,2983],"tags":[650],"class_list":["post-15902","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-astronomie-kenniscentrum","category-how-to-gidsen","tag-telescoop-collimatie"],"acf":[],"jetpack_featured_media_url":"https:\/\/staging.telescoop.nl\/wp-content\/uploads\/2025\/07\/Hotech-SCA-lasercollimator-puntlaser-1-25-2-5.jpg","jetpack_sharing_enabled":true,"jetpack-related-posts":[{"id":4548,"url":"https:\/\/staging.telescoop.nl\/en\/telescoop-afstellen\/","url_meta":{"origin":15902,"position":0},"title":"Telescope Tuning: The ultimate guide to razor-sharp observations","author":"admin","date":"04-11-2024","format":false,"excerpt":"Een telescoop afstellen is \u00e9\u00e9n van de belangrijkste stappen voor iedereen die het heelal helder wil waarnemen. 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