{"id":33652,"date":"2025-11-14T11:44:09","date_gmt":"2025-11-14T10:44:09","guid":{"rendered":"https:\/\/www.telescoop.nl\/?post_type=product&p=33652"},"modified":"2026-05-18T16:10:54","modified_gmt":"2026-05-18T14:10:54","slug":"william-optics-ap-51-178-apochromatic-refractor-minicat-wifd-ota","status":"publish","type":"product","link":"https:\/\/www.telescoop.nl\/en\/william-optics-ap-51-178-apochromatische-refractor-minicat-wifd-ota\/","title":{"rendered":"William Optics AP 51\/178 Apochromatic refractor MiniCat WIFD OTA"},"content":{"rendered":"

Compact, light and ready for sharp astrophotos<\/h3>\n\n\n\n

The William Optics AP 51\/178 MiniCat is made for photographers who want to capture clear images quickly and easily.With its f\/3.5 brightness, you'll make short exposures without noise. Your image remains flat and sharp to the corners, so you'll have less editing to do and more time to shoot.
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\"William<\/figure>\n<\/figure>\n\n\n\n

Powerful optics in a super small tube<\/h3>\n\n\n\n

The six-piece lens assembly gives you high image quality in a surprisingly compact telescope.The short tube length makes it easy to take this refractor on trips. Even small mounts like a SkyGuider will carry it without any problems.With its low weight of only 1.67 kg, your setup will remain light and stable.<\/p>\n\n\n\n

Designed for effortless photography<\/h3>\n\n\n\n

The M48 mount makes connecting your camera easy. Simply attach it, focus, and you're ready to go. The Bahtinov mask is cleverly hidden in the dew shield. Simply click it out, focus precisely, and you're ready to shoot. You get a wide, corrected field of view, ideal for full-frame cameras.<\/font><\/font><\/p>\n\n\n\n

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

For astrophotography as well as nature photos<\/h3>\n\n\n\n

The MiniCat 51 works great at night. Star fields, nebulae and large objects get instant texture and clarity.During the day, it delivers just as tight an image for nature photography. So you get one compact telescope for everything.<\/p>\n\n\n\n

Beautiful workmanship and reliable construction<\/h3>\n\n\n\n

The aluminum tube feels sturdy and remains low-vibration.William Optics' finish not only looks good, but is built for longevity.The included carrying case protects your telescope on the go and keeps everything compactly together.<\/p>\n\n\n\n

Specifications<\/strong><\/h1>\n\n\n\n

Optics<\/h3>\n\n\n\n
Feature<\/th>Description<\/th><\/tr><\/thead>
Type<\/td>Refractor<\/td><\/tr>
Design<\/td>Apochromat<\/td><\/tr>
Aperture (mm)<\/td>51<\/td><\/tr>
Focal length (mm)<\/td>178<\/td><\/tr>
Focal Ratio (f\/)<\/td>3,5<\/td><\/tr>
Resolution<\/td>2,71\u2033<\/td><\/tr>
Limit value (mag)<\/td>12,3<\/td><\/tr>
Light output<\/td>50<\/td><\/tr>
Max. useful magnification<\/td>102\u00d7<\/td><\/tr>
Tube weight (kg)<\/td>1,67<\/td><\/tr>
Tube length (mm)<\/td>274<\/td><\/tr>
Tube material<\/td>Aluminum<\/td><\/tr>
Coating<\/td>Multiple<\/td><\/tr>
Tube construction<\/td>Full tube<\/td><\/tr>
Dew cap diameter (mm)<\/td>80<\/td><\/tr>
Lens Design<\/td>Quintile<\/td><\/tr>
Glass material<\/td>OHARA FPL-53<\/td><\/tr>
Corrected field of view (mm)<\/td>43,2<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

Focuser<\/h3>\n\n\n\n
Feature<\/th>Description<\/th><\/tr><\/thead>
Tilt adapter<\/td>No<\/td><\/tr>
Design<\/td>Internal<\/td><\/tr>
Camera connection<\/td>M48<\/td><\/tr>
Backfocus (mm)<\/td>59<\/td><\/tr>
Free opening (mm)<\/td>48<\/td><\/tr>
Rotatable<\/td>Yes<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

Mount<\/h3>\n\n\n\n
Feature<\/th>Description<\/th><\/tr><\/thead>
Design<\/td>OTA<\/td><\/tr>
Type of mount<\/td>Azimuthal<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

Included accessories<\/h3>\n\n\n\n
Section<\/th>Description<\/th><\/tr><\/thead>
Dew cap<\/td>Yes<\/td><\/tr>
Transport bag<\/td>Yes<\/td><\/tr>
Bahtinov mask<\/td>Yes<\/td><\/tr>
Dovetail<\/td>Arca-Swiss & Vixen-Style<\/td><\/tr>
Photo tripod connector<\/td>Yes<\/td><\/tr>
Corrector<\/td>Integrated<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

General<\/h3>\n\n\n\n
Feature<\/th>Description<\/th><\/tr><\/thead>
Series<\/td>Cat<\/td><\/tr>
Color<\/td>Red<\/td><\/tr>
Observation goals<\/td>Astrophotography (very good), Moon & Planets, Nebulae & Galaxies, Nature observation<\/td><\/tr>
Sun<\/td>No (only with appropriate filters)<\/td><\/tr>
Recommended for<\/td>Advanced<\/td><\/tr>
Observatory use<\/td>No<\/td><\/tr><\/tbody><\/table><\/figure>","protected":false},"excerpt":{"rendered":"

William Optics AP 51\/178 comes with a protective nylon carrying case, an integrated Bahtinov mask, dew cap and an Arca-Swiss & Vixen-Style dovetail. This ultra-compact astrograph is perfect for travel and astrophotography with maximum image quality.<\/p>\n

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