Cross posted from the other TC thread...
Heres a few more images for you to look at..
A few quick images from this morning...
A crow stopped by up on the hill. The impressive thing to me in this shot is the crow is at least 40 meters away from me, the image is cropped to maybe 50% of it's original size and it still shows good feather detail. I'm not sure you could make the argument this shot could have been as good without the TC.
And of course, your usual squirrel images.
Full reach image 60-250 with 1.7 (shows as 450 in exif)
Full reach image 60-250 with 1.4 (show as 350mm in exif)
Full reach image 60-250 (shows as 250 in exif)
60-250 with 1.7 scaled as close as I could guestimate to 250..
60-250 with 1.4 exif says 252 mm.
The new TC 1.4 is definitely easier to use, calculates your focal length with the TC on and will probably live on my 60-250 when needed. The 1.7 TC is more difficult to use. But after the initial focus, the short throw of the TC acts as a limiter making AF very quick, it has noticeably more reach, but it doesn't accurately report the change in zoom setting, reporting everything as the max. available setting, so my 250 mm image (above) in the exif show 450.
The 1.7 also ads partial AF to MF lenses which the 1.4 does not.
I'm planning on keeping both.