{"id":34064,"date":"2025-11-16T15:18:43","date_gmt":"2025-11-16T14:18:43","guid":{"rendered":"https:\/\/www.telescoop.nl\/?post_type=product&p=34064"},"modified":"2026-03-17T14:43:50","modified_gmt":"2026-03-17T13:43:50","slug":"william-optics-61mm-2-4-inch-apo-guide-star-guidescope-red","status":"publish","type":"product","link":"https:\/\/staging.telescoop.nl\/en\/william-optics-61mm-2-4-inch-apo-guide-star-guidescope-rood\/","title":{"rendered":"William Optics 61 mm 2.4\u2033 APO Guide Star Guidescope Red | Telescoop.nl"},"content":{"rendered":"

Sharp stars for precise guiding<\/strong><\/h3>\n\n\n\n

The William Optics Apo61 is a compact guidescope with an FPL-53 objective. This glass produces bright, sharp stars so that your main telescope tracks accurately. Perfect for refractors with a focal length of 700 to 1200 mm.<\/p>\n\n\n\n

\n
\"William<\/figure>\n<\/figure>\n\n\n\n

Suitable for astrophotography<\/strong><\/h3>\n\n\n\n

With the optional Flat61 flattener, you can also use the Apo61 for astrophotography. You then get a flat image field, ideal for small camera mounts. This makes it easy to take clear, sharp night shots.<\/p>\n\n\n\n

Easy focusing<\/strong><\/h3>\n\n\n\n

Helicoidal focusing works through the dew cap. Loosen the ribbed counter ring, slide the cap until the focus is correct, and tighten. The retractable extension piece on the back gives added flexibility. So you'll always find the perfect focus quickly.<\/p>\n\n\n\n

\n
\"William<\/figure>\n<\/figure>\n\n\n\n

Solid and practical construction<\/strong><\/h3>\n\n\n\n

The Apo61 is made of aluminum. It is light (1.44 kg) and 340 mm long. The guidescope has a dovetail for easy mounting and comes with a transport bag. Everything is designed for stability and convenience.<\/p>\n\n\n\n

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

Optics<\/strong><\/h4>\n\n\n\n
Feature<\/th>Description<\/th><\/tr><\/thead>
Lens diameter (mm)<\/td>61<\/td><\/tr>
Focal length (mm)<\/td>360<\/td><\/tr>
Aperture ratio (f\/)<\/td>5,9<\/td><\/tr>
Optics coating<\/td>Multiple<\/td><\/tr>
Resolution<\/td>2,3\u2033<\/td><\/tr>
Limit value (mag)<\/td>10,3<\/td><\/tr>
Light output<\/td>50<\/td><\/tr>
Max. useful magnification<\/td>100\u00d7<\/td><\/tr>
Type<\/td>Refractor<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

Focuser<\/strong><\/h4>\n\n\n\n
Feature<\/th>Description<\/th><\/tr><\/thead>
Connection (camera side)<\/td>M54<\/td><\/tr>
Ocular connection<\/td>2\u2033<\/td><\/tr>
Fine control<\/td>Yes<\/td><\/tr>
Ring clamp<\/td>Yes<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

Mounting & accessories<\/strong><\/h4>\n\n\n\n
Feature<\/th>Description<\/th><\/tr><\/thead>
Dovetail<\/td>Yes<\/td><\/tr>
Transport bag<\/td>Yes<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

General<\/strong><\/h4>\n\n\n\n
Feature<\/th>Description<\/th><\/tr><\/thead>
Type<\/td>Guiding<\/td><\/tr>
Design<\/td>Guidescope<\/td><\/tr>
Exterior material<\/td>Aluminum<\/td><\/tr>
Weight (g)<\/td>1440<\/td><\/tr>
Length (mm)<\/td>340<\/td><\/tr>
Color<\/td>Red<\/td><\/tr>
Application<\/td>Astrophotography (Guidescope)<\/td><\/tr><\/tbody><\/table><\/figure>","protected":false},"excerpt":{"rendered":"

William Optics Apo61 comes with FPL-53 glass for sharp stars, a helicoidal focus, Vixen-style dovetail and a transport bag. \u00a0<\/p>","protected":false},"featured_media":97494,"comment_status":"open","ping_status":"closed","template":"","meta":{"_acf_changed":false},"product_brand":[643],"product_cat":[56],"product_tag":[],"class_list":["post-34064","product","type-product","status-publish","has-post-thumbnail","product_brand-william-optics","product_cat-telescoop-accessoires","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":34051,"url":"https:\/\/staging.telescoop.nl\/en\/william-optics-61-guidescope-guide-star-apo-goud\/","url_meta":{"origin":34064,"position":0},"title":"William Optics 61 Guidescope Guide Star Apo Gold","author":"","date":"16-11-2025","format":false,"excerpt":"William Optics 61 comes with FPL-53 glass for sharp stars, a helicoidal focus, Vixen-style dovetail and a transport bag. \u00a0","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\/William-Optics-Guidescope-Guide-Star-Apo-61-4.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/11\/William-Optics-Guidescope-Guide-Star-Apo-61-4.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/11\/William-Optics-Guidescope-Guide-Star-Apo-61-4.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/11\/William-Optics-Guidescope-Guide-Star-Apo-61-4.jpg?resize=700%2C400&ssl=1 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ZenithStar 81\/559 APO WIFD Red OTA","author":"","date":"15-11-2025","format":false,"excerpt":"William Optics AP 81\/559 81 wordt geleverd met een WIFD interne focuser, buisringen, Arca-Swiss & Vixen-style zwaluwstaart, handvat, Bahtinov-masker, adapters en een zachte draagtas. \u00a0","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\/William-Optics-AP-81-559-81-Apochromatische-refractor-ZenithStar-WIFD-Red-OTA-2.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/11\/William-Optics-AP-81-559-81-Apochromatische-refractor-ZenithStar-WIFD-Red-OTA-2.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/11\/William-Optics-AP-81-559-81-Apochromatische-refractor-ZenithStar-WIFD-Red-OTA-2.jpg?resize=525%2C300&ssl=1 1.5x, 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