ASKAR FRA600 108mm Professional Astronomical Telescope F5.6 Quintuplet Petzval Telescope for Deep Sky Photography

ASKAR FRA600 108mm Professional Astronomical Telescope F5.6 Quintuplet Petzval Telescope for Deep Sky Photography

Description:
- The FRA600/5.6 (656) upgrades the aperture to 108mm, maintains the F-ratio of 5.6, achieves a focal length of 600mm, and the imaging circle surpasses the full frame by 66mm.
- Adopting a Petzval structure similar to FRA400, with a combination of three front and two back lenses, a total of five lenses are used, including two ED glasses, to ensure high-quality astronomical imaging.
- The excellent optical design ensures that the FRA600 has uniform and flat star points within various ranges of the 66mm imaging circle, with minimal deformation.
- The two lenses in the rear group have a diameter of 80mm, effectively reducing the field of view illumination and dimming effect. The rigorous lens processing ensures that the maximum magnitude of the star point is close to the theoretical design, bringing you a clear and delicate visual experience.
- The 4.2-inch oversized toothed focusing device is equipped with a 1:10 fine adjustment handwheel, which allows for precise focusing while increasing the load capacity to a professional level. Connecting heavy-duty professional imaging equipment and accessories ensures stable operation, enabling each device to quickly enter its optimal working state.
- The focusing device is equipped with multiple built-in connection threads, and the standard accessory: the conical shooting extension tube is also equipped with threaded interfaces of M54x0.75 and M48x0.85, making it easy to connect various related devices.
- The main lens barrel has a diameter of 120mm and is equipped with a retractable light shield, with a total length of only 493mm when retracted, making it possible for high-quality portable 4-inch star cameras.
- A pair of multifunctional clamps with multiple rows of reserved connection holes make it very flexible and convenient for users to arrange related accessories such as guiding cameras.
- Like FRA400, FRA600 not only perfectly supports flat large format astronomical photography, but also excels in high-quality observation, providing a visually pleasing experience with minimal color difference and high contrast, allowing you to immerse yourself in it and never forget its high-quality performance.

Specification:
- Aperture: 108mm
- Focal length: 600mm
- Focal ratio: F5.6
- Objective lens type: Quintuplet Petzval APO (including two pieces of SD glass)
- Imaging circle: 66mm
- Rear intercept: 160mm
- Total length: 493mm
- Body net weight: 6.5kg
- En interface: M108 x 1 external threaded (excluding rotator), M90 x 1 external threaded, 2-inch port/1.25-inch port
- Conical interface: M90 x 1 to M54 x 0.75; M54 x 0.75 to M48 x 0.75

Package Included:
- 1 x Telescope
- 1 x Pair of Clamps
- 1 x Handle
- 1 x User Manual