Vixen SD81S

Worth knowing before you buy

Is the SD81S made in Japan and how does it compare to Chinese-made Vixen models?

Yes, the SD81S is made in Japan (the 'S' suffix indicates Japanese manufacture). Multiple owners report it is optically superior to Chinese-made Vixen models and comparable to Synta ED80 scopes, with better scatter control, contrast, and mechanical fit.

How good are the optics for the price?

Members consistently praise the optics as excellent and the main strength of the scope. Owners report zero chromatic aberration even on the full moon, impressive planetary detail for a 3-inch scope, and ability to reach deeper than expected.

What are the mechanical weaknesses?

The primary criticism is the single-speed focuser, which members describe as basic but adequate for visual use. The focuser draw tube has slight play and is not as precise as Takahashi equivalents, though one owner found after adjustment it performed well.

Is the SD81S a good value compared to Takahashi or other premium brands?

Members note the costs are now very close to Takahashi FC100 models, reducing the value advantage. Used Vixen SD81S models represent better value than new, with one buyer reporting ≈$600 for a like-new example.

How light and portable is it, and what mount do people use?

Multiple owners emphasize it is extremely light and portable, making it accessible and encouraging regular use. One owner successfully uses it on a Porta II mount, and another notes it is much lighter than many modern short-focal-length 80mm ED scopes.

How does it perform for both visual observation and astrophotography?

Members report excellent visual performance for lunar, planetary, and deep-sky observation, including successful white-light solar viewing. One owner regularly uses it for both visual and imaging, describing crisp, sharp views with zero color aberration.