Welcome to use brand new ASKAR FRA series! 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.
Adhering to easily convert lens Parameters, our first FRA series product is quintuplet Petzval like telescope with 400mm focal length, f/5.6 and 72mm aperture, including two special ED glasses. 44mm full frame image circle is supported.
The telescope tube, with its push-fit dew shield, the 3" large rack-and-pinion focuser for microdriving adjustment in astrophotography and observation is including 360°rotator and 2" adapter ring and 1.25" eyepiece adapter with M68x1 thread.

This FRA600 Quintuplet Refractor is also built on a Petzval design, offering a front triplet and rear doublet lens constructed of 5-element, includes two ED elements. This combination provides a high level of apochromatic performance for astroimaging.
With wonderful optics design, the FRA600 telescope provides a 66mm image circle to ensure excellent star shape across the entire flat field whilst controlling chromatic aberration, minimizing the distortion.
The two lens in the rear group have a 80mm diameter, effectively reduces the occurrence of decreased field illumination. With the precision lens manufacturing, it obtains theoretical optimal pinpoint stars, bringing you beautifully round stars and clean detail image.

The FRA600 comes fitted with a large 4.2" rack and pinion focuser and includes the standard 1:10 micro-adjustment knob, the focuser lift the payload to a pro level, offers smoothly operation when heavy imaging equipment and accessories are attached, without slipping, becomes a performance upgrade.
The focuser allows multiple connection thread. Askar offers a standard conical extension tube with M54x0.75 and M48x0.85 thread to connect various photography equipments. 
Mechanically, the FRA600 has a tube diameter of 120mm and a retractable dew-shield. With the dew-shield retracted, the total length is only 493mm, making it a great portable 4" astrograph. 
A set of multifunctional red anodized tube rings that include mounting points on three sides, makes it easy to attach accessories such as guider scope for backyard viewing. 
In addition to supporting wide field astrophotography, the FRA600 is also perfect for high quality observation, provides complete lack of chromatic aberration and create images with impressive contrast of realistic visual experience.
If the FRA600 is just a triplet APO refractor, then the price is reasonable, but the FRA600 is a 4.3" Quintuplet Super APO FRA600 Astrograph, its build and finish are unprecedented for an astrograph in this price range, moreover, the FRA600 offers cost-effective superb performance, is a pleasure to use.