ASKAR FMA180 reducer features Triplet air-spaced design, combined use with objective lens, providing clear and sharp image, specifically optimized for astrophotography, which is its strong point, you don't have to worry about chromatic aberration that can appear in the image field. Using the f/4.5 reducer makes it capable of capturing clear astrophotos in considerably less time.
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For traditional astrophotography, it is difficult to achieve a focal length of less than 200MM with commercially available telescopes. The only choice in this range is the ordinary camera lens. However, the camera lens is not optimized for astrophotography, so the result is not satisfactory.
FMA180 makes it new, if you wanted to capture deep-sky objects, it will get superior optical performance in image like telephoto prime lens.