BirdForum is the net's largest birding community dedicated to wild birds and birding, and is absolutely FREE!

Register for an account to take part in lively discussions in the forum, post your pictures in the gallery and more.

Reply to thread

Message: <blockquote data-quote="Jim M." data-source="post: 3529357" data-attributes="member: 60675">The 100-400.  Your original post mentions shooting large mammals, including cows and marine mammals from a boat.  The 300 mm prime, which for birding purposes is usually used with the 1.4x teleconverter, won't work well for those subjects/situations because the field of view is too narrow.  Unless your subjects are distant, all you will be able to shoot would be the head.As for the 75-300 mm, you could get some good shots with it but having the extra reach of a 400 mm is definitely helpful for bird photography.</blockquote>