FMA180 make it new, if you wanted to capture extended deep-sky objects, it will get superior optical performance in image like telephoto prime lens.
In addition to photography and observation, FMA180 is also suitable for a high-performance finder-guider of your choice. The overall tube length is 145mm, the small size of FMA180 tips the scales at a mere 395g.
Therefore, the assembled product includes a pair of tube rings and a finderscope bracket, which can be easily attached to the finder base on the market. In addition, the finder bracket can be divided into two parts, among which the dovetail plate can be used alone, and it can be connected to the tripod with standard camera thread and other head. This ARCA-SWISS standard dovetail can be connected to the corresponding plate slot more conveniently, and it can also attach to the VIXEN narrow equatorial adapter. Hence you can get rich connectivity for both photographic purposes and observation.
Its small size could be directly attached to camera like a normal lens, easy to carry away the view time.
Below are FMA180 usage patterns for reference:
2) Main tube + focuser + extension tube 1 + extension tube 2: 220mm F5.5 triplet APO lens
2) Main tube + focuser + extension tube 1 + extension tube 2: It can be combined with 1.25" eyepiece for visual observation mode or finderscope mode.