Refractor telescopes

We could summarize the William Optics ZenithStar 61 II APO Doublet refractor as small and serious or seriously small. It’s a small, highly portable instrument with a 61mm aperture, f/5.9, two element FPL-53 color corrected ED doublet lens, which impresses, especially when used for astrophotography. In addition, this WO ZS61 II also has a 2″ R&P focusing device, cat handle bar, and a built-in Bahtinov mask. The ZenithStar 61 is the ideal travel companion and comes with a bag.

Read more about the William Optics ZenithStar 61 II here

If you are interested in both nature photography and (deep-sky) astro photography, a William Optics RedCat 51 is for you. The RedCat’s 51mm objective lens is made of top quality FPL-53 and FPL-51 glass (synthetic fluorite) that creates a flat frame image from corner to corner, even when the full circle of image is used with a full-frame camera. The built-in helical focusing device enables focusing in seconds, which is ideal for shooting wildlife, birds and other animals.
The 250mm focal length and fast f/4.9 allow short exposure times for astrophotography. The working distance of up to 59.70mm is ideal for using astrocameras and DSLR/SLR cameras. The 2″ thread in the T-ring also allows you to use a filter. The included Bahtinov mask helps focus astrophotographic objects and is integrated into the lens cap.

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The William Optics GT81 IV APO telescope is a three element designed APO refractor. By using FPL-53 glass, this telescope offers excellent aberration correction. Sublime telescope for observing the moon and planets and photographing Deep Sky objects. Has a built-in clear Bahtinov mask. Smooth, stable and reliable, the 2.5″ Rack & Pinion focusing device does not suffer from image shifting and includes a newly designed camera angle rotator. The CNC rod is sturdy and has a nice appearance.

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The FLT 91 is the perfect apochromatic refractor for visual and photographic astronomers who demand quality in a medium-sized telescope. The three-element optical design has a 91mm aperture with FPL-53 glass. The STM coatings and excellent quality ensure excellent optical performance and an unparalleled Strehl value, of at least 0.95 or higher. The focusing device of the FLT 91 is a 3.3 inch rack and pinion type. The focusing tube has an adapter to a 2-inch rotolock adapter. This adapter makes it possible to quickly change accessories, but also to clamp them properly without causing damage. Furthermore, the entire focusing device is rotatable, but there is also a built-in rotator with scale division. Larger buttons on the focusing device make focusing a pleasure.

Read more about the William Optics FluoStar 91 here

In our wide range you will only find the best refractor telescopes. Many of our products are therefore available from stock. In addition, our prices are very accessible. Have you found a product cheaper elsewhere? Then contact us! You can reach us at 020-6412083. We are happy to provide you with more information. We also tell you more about our microscopes and binoculars. You are also very welcome in our showroom in Amstelveen.