Thanks to the native Petzval design, the user does not need to calculate the backfocus, as long as the focus is within a certain range is the optimal position.
Mechanically，FRA300 Pro is assembled with high-quality CNC-machined components , wrapped with smooth spray coating and light oxidation process,both beautiful and practical.The tube ring design is equally lightweight and stylish.Despite the increased cost, we want enthusiasts to use the FRA300 Pro that perform well in every way and are considered in every detail.
The focuser is 2.5"rack-and-pinion focuser, which is solid and beautiful.It's designed with dual-speed hand knobs, twin knobs for coarse adjustment and a fine adjustment knob to accurate the focus, equipped with a universal M48X0.75 thread adapter. There are also two separate M54X0.75 and M48X0.75 adapters in the standard kit for easy access to a variety of imaging equipment and accessories. The end is equipped with a 360° rotator, which is convenient for users to rotate at any angle when shooting.
FRA300 Pro also comes standard with a multi-function handle and a 300mm vixen-style dovetail plate, which can be directly connected to various mounts and accessories, the multi-functional handle can also be connected to the universal vixen-style finder base.The 300mm dovetail plate allows the astrograph to maintain balance on the mount.
Askar FRA300 pro + ASI 2600MC，Optolong L-Enhance，27x600
Objective lens：quintuplet fully air-spaced Petzval APO (including one ED glass)
Image circle：44mm full-frame
Maximum accessory connection (with the focuser fully retreated)：
1. Imaging mode:
71mm (from the base of M42×0.75 male thread)
67mm (from the base of M48×0.75 male thread)
71mm (from the base of M54×0.75 male thread)
Rear-end thread ：M48*0.75 male thread
Standard package items：a tube ring, a handle, an Askar 300mm Vixen dovetail plate, a M42*0.75 adapters, a warranty，a manual