• 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

  1. B

    Used ED82

    It may be that the lens elements are at the poor end of the normal range, and the result is a poor example of this Nikon telescope. This may be within Nikon's pass rate. Actually, it would take a very skilled optician to optimise lens element spacing and it is doubtful any of the normal...
  2. B

    Used ED82

    The technician probably does not have the necessary skills to do star tests. It may be someone has worked on the scope already. The spacing may be incorrect, the objective elements may have rotated by themselves. I have even had objective elements back to front. Just because the technician...
  3. B

    Used ED82

    If something has ben knocked out of alignment then it would show in the star images. However, possibly the spacing of the elements might be incorrect, which could lead to softness. I would ask Nikon to check this, as it may be something they don't normally look for. If you have very good...
  4. B

    Used ED82

    There may also be temperature effects because of the tube and because of local atmospheric conditions. Also ground level observations may be non optimal. Don't observe over concrete or asphalt or buildings. Regards, B.
  5. B

    Used ED82

    It is good it is clean inside. Maybe a good example should be sharp at 75x. Is the out of focus star image good, circular and central? Regards, B.
  6. B

    Used ED82

    Maybe internal condensation, perhaps on the eyepiece/body connection. Shine a torch into the front, or look into the front with a 60 watt bulb behind. Possibly also balsam failure? Regards, B.
Back
Top