Hi again, Not particularly into birding, but yes - agree a good prime is probably best.
Worryingly I've seen a few of these 80-400's for sale on ebay for spares/repair ?? & Might probably drift into just using the 400 end ??
I have an older (but very quick focusing Nikkor f4/5.6 70-210 AF-D) which is really compact@ only 6" & whilst not a 2.8, isn't a 2.8's weight ..size or Â£ either .
I also have nikkor 50 1.8 af-d , an 18-70 AF-s +an older vivitar 55mm/2.8 MF macro (really nice piece for an independent)
& this sigma 400mm ... I'll have to try the +20 adjustment, & see if that solves the problem of fEE error .
So, only reservation is the lack of close focus range,v.Sigma, but think if the right one comes up, may plumb for the Nikon 300 ,built like a truck & add a TC- kenco , or sigma who seem to be the top of the 3rd party pile (unless I sell the wifes car this time!) would suit.
Think I'm also right in saying an f4 300mm + x1.4 TC= 420 anyway,albeit 420 @ f/5.6 ish
Thanks a million for the input,2 heads better than 1 etc etc, might have to get Jan out the way 1st, but see where I end up .
Off to bury my head in the manual now for the +20 section. :- )