Originally posted by falconeye So true.
I am normally happy if I found the bird again in the viewfinder as it is constantly leaving it ... (at such long FLs). That's actually an advantage a FF viewfinder would give me: keeping the bird longer in VF
only on the assumption that you did not attempt to fill the viewfinder by creeping up on the bird trying to frame it in the bigger full frame
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Also, I am wondering how any current EVF could be fast enough to this challenge.
NOT i wouldnt even want to think about it, my experience with bridge cameras is the shutter lag is so bad, you need to press the shutter before the bird lands to have a chance of getting it in frame, sitting on the branch. the one advantage of small sensor EV cameras, is the relitively fast optics. My Kodak DX7590 is an F3.2 at maximum focal length, with a 35mm equivelent of 360mm. it sure weighs a lot less than any one's 300/2.8
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In comparison, I found it surprising that the K-5's phase AF with 1.7x TC was fast enough to aquire focus. It's really not such a bad system ... Of course, the 1.7x works like a focus limiter helping in this case. So, I actually prefer it over the 1.4x TCs.
I really like the AF TC. I have used it since my PZ-1 in 1991, and much of this has been with the K300/4 Then, I was somewhat light limited, unless I used flash, due to the low ISO of films, but my experience is that even the K7 at 1600 was a s good as film at 400 so it does get a lot more use now, and with the K5 it is even better.
The fact that you are in
Semi Auto Focus because it only has about 7mm effective focus throw, actually works well for shooting through a maze of branches.