• 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. J

    Please school me on the Pentax 65

    Hi, quite frankly, if you have a scope that is doing 20x well (which is not very difficult) and you only want/need 20x, there is not really a need to upgrade. Regarding the EP question for the Pentax with a body focal length of 390mm we get 390mm / 20 = 19.5mm or 390mm / 25 = 15.6mm. My...
Back
Top