SharpStar

As the first long-focal-ratio Flatfield astrograph from Askar, 107PHQ is born with a special mission: whether you are just getting started in astrophotography, or an enthusiast who has been quite familiar with all equipment and devices, you can always find Askar 107PHQ a useful astrograph which is functionally practical and physically attractive. Description This telescope is especially amateur or beginner friendly since you don’t need to attach an extra field flattener to get a satisfactory picture. And for the fact that you don’t need a flattener and you can easily get over back-focus calculation and confusing connection steps, all you...

Askar’s new-launched 3” 0.7x full-frame reducer adapts for 107PHQ & 130PHQ. It has a triplet design with one ED glass. Description The 0.7x reduction gives 107PHQ a shortened focal ratio of 4.9 and a shortened focal length of 524mm. This reducer, connected with the astrographs, can effectively shorten the exposure time and dramatically increase your field of view, bringing more convenience and possibilities for your deep-sky astrophotography.

Askar provides a brand-new F/3.9 full frame reducer for FRA400 astrograph, further reducing the focal length and thus shortening the exposure time on its original 400 focal length and f/5.6 focal ratio design basis. The reduction factor is 0.7×, and the reduced focal length is 280mm, which can satisfy most deep-sky astrophotography. The back focus is standard 55mm. The reducer has built-in M48×0.75 thread, allowing for the attachment of 2" filters. This reducer also works with the FRA500

Since their inception, Askar FRA series short focal ratio astrograph have been very well received by astronomical amateurs. This year, we launched the FRA300 Pro - the smallest 60mm F/5 Petzval astrograph with the fastest native focal ratio in the FRA series so far, its focal length is 300mm. Description The star is sharp and delicate. At the center of its field of view, the RMS radius can reach 2um. Even a serious user can also be satisfied when it comes to the shape of stars. It performs excellence with full-frame and supports 44mm imaging, which is a rare astrograph...

The FMA230 has a compound lens system. The front objective lens comprises three lenses and the posterior reducer is composed of four lenses and thus it’s sometimes dubbed as a “three at the front and four at the rear” system. The aperture size of the objective lens is 50mm and the original focal length is 275mm thus we’ve got a relatively fast focal ratio of f/5.5. The objective lens contains two ED glasses which are adapted to cure chromatic aberrations. Description One can barely find an equal counterpart in the market as designing a three-element apochromatic objective lens in astrograph...

The FRA, which stands for "Flatfield Refractive Astragraph", is a refractive astrograph designed for built-in flat field correction. FRA also used in visual observation, this series creates versatile high-quality flat frame images for astrophotography, is the few great telescope of versatile optical tube. Description For easy parameter conversion between different lenses, the first-come of the FRA family features a Petzval-like quintuplet design (two pieces of which are special ED glass) with an aperture of 72mm, a focal length of 400mm and a focal ratio of f/5.6, providing a 44mm image circle. The FRA400 quintuplet astrograph has adopted modern optical design...

Sharpstar Optics introduces Askar FRA500 astrograph, which is the youngest among the FRA family well-known to our customers. Compared with its siblings, the 500mm-focal-length refractor has an aperture size of 90mm (f/5.6), so Askar FRA500 can better fit into the scenarios of deep-sky imaging than the Askar FRA400. Besides, it is more lightweight and compact than Askar FRA600, which makes it a great choice for out-door observation or astrophotography. Description Askar FRA500 has inherited the legacies of superior FRA- series designing. It boasts a quintuplet air-spaced APO optical structure, a “three plus two” Petzval lens combination. The front lens group...

Askar introduced M54 off-axis guider for astronomy enthusiasts to achieve better guiding effect. The prism of Askar M54 OAG is 10×10mm, which can not only collect more light, but also make it easier to capture the targeted star and realize automatic guiding. Description Askar M54 OAG is designed with multiple threads, like M42, M48 and M54, which can basically satisfy the needs of accessory attachment. These novice-friendly adapters are easy to switch and replace. Askar M54 OAG functions well with a full-frame camera, better facilitating the imaging process of astrophotographers. The Askar M54 OAG is CNC machined, and the surface...

Askar Multi-Connection Plate 90 is a professional design especially for FRA400/5.6 astrograph. It also works well with other various handles provided by our company. The MCFP90 is a universal plate for all potential devices equipped with a standard Vixen dovetail foot. Note: Scope not included

The Askar Losmandy-style universal dovetail plate is made of lightweight aluminum alloy and is more resistant to scratches or collisions due to its anodized finish. Description The dovetail plate is compatible with a wide array of telescope tube rings. The heavy-duty design makes the Askar Losmandy-style dovetail plate useable with an extraordinary load capacity. With more mounting slots predrilled on the plate, users can slightly adjust the spacing between tube rings, thus having more possible mounting options. The mounting holes also meet more needs and offer more potential connections. The LDP200 model is 200mm long. There are four half-threaded holes...