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Posts Tagged 'refractor'

Tecnosky OWL – magnificent, sharp focusing apochromats

January 27 2022, Jan Ströher

A few years ago the Italian company, Tecnosky, started producing their new, own-brand triplet apochromats known as “OWL”. The first model in the series was the OWL 80/480 apochromat, which was released in spring 2021. The OWL 90/560 was hot on its heels, with the OWL 130/900 SLD soon following in autumn. Soon the range will be blessed with new 70mm and 125mm aperture models. All OWL telescopes are based on a triplet lens design with FPL53 fluoride glass. However, the soon-to-arrive 125mm OWL will be an ED doublet.

The OWL 90/560 triplet

These features, combined with fully multi-coated lenses, blackened lens edges and a lens hood on the tube guarantee Strehl ratios upwards of 0.95! An optical interferometric certificate is attached to every single OWL telescope. Every specimen, therefore, undergoes a detailed quality check before distribution.

Optical test report (certificate) for OWL devices

These compact apochromats are great devices for astrophotography and also offer first-class, pure-colour image quality and joy for observing. Tecnosky also supplies reducer-flatteners calculated to suit the optics for each model. This means that OWLs, with their aperture ratios of f/6 – f/7, are ideally suited to photography.

Aesthetically, these “owls” also make an impression – they are all manufactured from high quality materials, are multi-coated, elegantly manufactured and have a white, black and red colour scheme to complete their look.

OWL 80/480 with FPL53 fluoride glass

All OWL models come with compatible prism rails, pipe clamps, Vixen viewfinder shoe, carry handle and retractable dew shield. These are this apochromat’s main features alongside the rotatable focuser with 1:10 reduction and locking mechanism, as well as a sturdy carry case. All in all, you get a first-class telescope with numerous great features for a reasonable price for this size category. The OWL 70 and 125 models will be available in our shop from spring 2022.

Discover the Tecnosky OWL series and sharpen your view of the night sky – elegant design included!

Tags: telescope, Astrophotography, Deep-Sky, planets, refractor, Triplet, Tecnosky, Apochromat, FPL 53, OTA, Astroshop
Posted in New Products »

The new RedCat 71 from William Optics

December 15 2021, Jan Ströher

The time-proven and much loved RedCat 51 by William Optics has a new big brother – the RedCat 71. The same Petzval design with corresponding high-quality optics using FPL53 and FPL51 optics. With its 71mm aperture, the new “Cat” is a lot more powerful than the RedCat 51. The result is a pure-colour, corrected image field with a diameter of over 45 millimetres – ideal even for full-frame cameras! The fast f/4.9 aperture ratio facilitates short exposure times. At 3kg, the 335mm-long RedCat 71 weighs only slightly more than its smaller brother.

Once again, focusing is helical, adjusted by turning a ring on the lens tube.

The telescope comes with a protective carry case, as well as a Bahtinov mask specially designed for the RedCat. This mask aids focusing and is permanently and precisely fitted in the lens adapter.

The RedCat 71 is also perfect for deep sky astrophotography and offers not only impressive optical performance, but also William Optics’ attractive trademark design.

The new RedCat 71

To use the RedCat 71 for astrophotography you need a mount with a load capacity of at least 7kg due to its weight. The new iOptron mounts CEM26 or GEM28 are ideally suited for this.

Reckon you will soon be a “Cat” fan?

Discover the new RedCat 71 and William Optics’ ”Cat” series.

Tags: telescope, Astrophotography, Deep-Sky, refractor, William Optics, Apochromat
Posted in New Products »

Experience astrophotography with the Radian Raptor

November 3 2020, Jan Ströher

Under its own brand, Radian, the American telescope retailer OPT is now launching a high-performance, top-quality, and super-portable apochromat with triplet lens design, which has already created a great deal of enthusiastic anticipation among astrophotographers. The Radian Raptor is a light and compact photo machine which, with an aperture ratio of f/4.5, will, above all, ensure amazing deep sky images. With a shorter design and weighing just 1.8kg, the telescope can be attached to photographic tripods and travel mounts such as the Skywatcher Star Adventurer or the iOptron SkyGuide without any problem. This makes it a perfect travel companion that can be easily transported in the padded backpack supplied and fits in any hand luggage.

OPT has thought of everything you might need for successful astrophotography in this triplet apochromat:

A fast aperture ratio of f/4.5 allows short exposure times, ensuring that the Radian Raptor stands out as a fast wide-field device – ideal for images of emission nebulae, galaxies and star clusters.

The use of premium glass, coupled with multi-coated surfaces, results in this triplet apo’s colour-true, high-contrast and very sharp imaging capabilities. An already built-in corrector flattens the entire field of view, shows needle-sharp stars right up to the edges and so makes the use of full-frame sensors a pleasure. In addition, there is no need to purchase an additional flattener or reducer.

With a focal length of just 275mm, you have an ultra-compact telescope for extensive wide-field images: objects such as the Veil Nebula or the Horsehead Nebula in the constellation Orion fit completely into the field of view of a full-frame sensor. Here is an image of the California Nebula captured by the 61mm Radian Raptor:

A solid, rotatable 2.5″ rack and pinion focuser with a high load capacity and the 1:10 fine focusing ensure a stable connection to your camera and precise focusing. The hexagonal tube clamps have differently-threaded holes to attach various accessories and integrated cable channels in the clamps reduce cable clutter. Especially for astrophotography, other equipment such as guidescopes, dew heaters, control modules or remote controls are usually required in addition to the telescope itself. The Radian Raptor is designed by astrophotographers and takes all possible applications into account. The recommended back focus of 55mm can be achieved and precisely adjusted with the adapters included.

Another treat is the inclusion of two bars for attaching to your mount: a 4″ Vixen dovetail bar and a 6.5″ universal Losmandy bar with a correspondingly-wider surface area. Both bars also have threads to attach the Raptor to a photo mount. With these you have compatibility with all mounts/dovetail clamps.

Finally, you get a waterproof and padded backpack to safely store the Radian Raptor, which also offers space for a CMOS camera and other small items.

Experience a new chapter in astrophotography and optimise your equipment with the Radian Raptor**!

(**available from mid-November 2020 from us here at Astroshop!)