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  1. K

    I'm somewhat new to birding and have a question about possible major defects on my spotting scope (see pictures). Kowa TSN-99a

    Very good advice from Binastro. From your description of the optical performance of your particular 99A, it seems like an exceptionally good sample worth holding onto. The prism line you describe is a problem only if it is severe enough to cause astigmatic spiking in best focus stars, and it...