FMA180 Pro Lens Tube Diameter 40mm ED6 Element Compact Astrograph SHA0009P []Askar

Effective diameter: 40mm Focal length: 180mm Aperture ratio: F4.5 Back focus: 55mm from the rear edge of the M48 adapter Lens composition: 6 elements in 6 groups (including 2 ED lenses) Focuser: Helicoid inner focus Total length: 167.5mm Lens barrel/hood diameter: 58mm Mass: 0.8kg ●The FMA180 pro lens barrel is a small lens barrel with an aperture of 40mm, a focal length of 180mm, and an aperture ratio of F4.5. It is a compact astrograph with improved optical design and body design compared to the conventional "Askar FMA180", which bears the name "pro" and is sharper and has fewer aberrations. The main unit weighs only 0.8kg, making it lightweight and the total length 167.5mm. It can be mounted on a variety of mounts, including portable equatorial mounts, for astrophotography. ●The lens configuration is a flat field design with 6 elements in 6 groups, including 2 ED lenses. The image circle is φ44mm, and it can be used as a high-performance astrograph that can also be used for imaging with a full-size camera. The back focus from the rear end of the lens barrel is 55mm. ●Adopts an inner focus method that does not change the overall length of the lens barrel when adjusting the focus, increasing the rigidity of the entire system and achieving stronger and smoother focusing. ●The eyepiece side is also equipped with a 360° rotation device as standard. Additionally, the fixing knobs for the focus and rotation devices are of a large knurled type, greatly improving operability when wearing gloves or in dark places. vinegar. ●A finder base that can mount a finder dovetail with a bottom width of approximately 34 mm is included as standard, making it easy to install options such as an auto guider. ●M48×P0.75mm with minimal vignetting is used for connection with the camera. The structure allows an M48 filter to be built into the M48 adapter, making it compatible with a variety of shooting styles and subjects. ●Equipped with a narrow dovetail plate with a bottom width of approximately 44mm as standard. It can be mounted directly on many manufacturers' stands. In addition, by removing the plate, it becomes a finder leg with a base width of approximately 34mm, making it easy to attach to the finder dovetail of other telescopes.