A wonderful tool for astrophotography telescopes: reduce exposure time and simplify astrophotography; suitable for shooting. Capture wider field of view; the focal reducer is good for visual use for a bigger FOV and is indispensable when CCD imaging.The case is made of metal, which better protects the product itself and prolongs its service life.FMC optical glass design 2 pieces of optical design, increase the light transmittance; the image is brighter and clearer. 2 element optical design with fully multi-coated optics. Fully anti-reflection coatings on all air-glass surfaces for increased contrast.The SV205 camera has 8 million pixels, and the sensitivity of IMX415 has been significantly improved, especially in low-light environments; the frame rate has reached 30fps, and both preview and shooting are extremely smooth. 7.05MP resolution YUV format transmission speed of up to 15 frames/sec.