Welcome to Michael's blog. Michael Andrew, (aka Michael The Maven) is a freelance producer, photography instructor, tech innovator, and when needed, disaster aid specialist. Disclaimer: Michael is a participant in Bhphoto & Amazon affiliate programs that provides an advertising commission if you purchase through links on this website.
On the 400 2.8 Prime: It appears this is in a rumor stage only, and sources disagree if this is a f2.8 or f4. It was my personal error to say it has been officially announced, and for that I apologize! Apparently I read an article about 2 other lenses being officially announced, and the 400 2.8 being rumored, so I misunderstood. Sorry guys! On the other hand, I believe Sony is just too smart to not be working on a 400 Prime, whatever aperture it is, here are some of the rumors:
Full Disclosure: While I have not received any compensation for performing these tests, I am an affiliate of BHphoto.com who provided the cameras stated without cost to me and I also receive a small commission for any purchases made through these links provided. LensProtogo.com supplied the 70-200 2.8 Nikon lens, for the tests, but I am not an affiliate. Thanks!