• 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. Roy C

    R7 + rf 100-500 crop factor question

    The max aperture only changes if you add an extender (e.g you will lose 1 stop with a 1.4x extender). On the R7 with the bare lens the fov equivalent is 800mm (at f7.1). I most always use the 100-500 with a 1.4x extender so this gives me 1120mm at f10. I also have the RF 800/11 which gives a...
Back
Top