• 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. R

    Comparisons and differences in the current "Alpha" bins?

    Unless you are in your 20s an exit pupil of 7mm is wasted. Which is more important physics or physiology?, The size of the dilated pupil declines with age (mine are less than 4mm, probably nearer 3 - measured by my optometrist) . Very few serious birdwatchers and ornithologists use 8x56. I...
Back
Top