• Welcome to BirdForum, the internet's largest birding community with thousands of members from all over the world. The forums are dedicated to wild birds, birding, binoculars and equipment and all that goes with it.

    Please register for an account to take part in the discussions in the forum, post your pictures in the gallery and more.
ZEISS DTI thermal imaging cameras. For more discoveries at night, and during the day.

Search results

thxpress_search_the_forum Search Opus
  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...
Back
Top