tag:blogger.com,1999:blog-1199046130419769252.post3538192622815122626..comments2023-07-10T10:12:16.190-05:00Comments on Me and my aperture: My first hummingbird shotsrbadiolahttp://www.blogger.com/profile/01706706959992546284noreply@blogger.comBlogger2125tag:blogger.com,1999:blog-1199046130419769252.post-61035657861187117772013-12-30T23:39:04.112-06:002013-12-30T23:39:04.112-06:00Yes, the Kenko 1.4 that I have works together with...Yes, the Kenko 1.4 that I have works together with the Canon 400mm f/5.6 without any modifications. The autofocus works fine and pretty fast. I have tried the Kenko 1.4 on a 70-200 IS USM f/2.8 lens but the autofocus was really slow. With the 400mm it seems a bit slower than normal but it still is pretty fast. The only thing about using the 400mm with a tc is the image quality degrades a lot. Fringing is so visible and any imperfections on the glass is easily seen. Also, vignetting is also bad with this combination. I wouldn't really use this combination if you want excellent image quality. The 400mm f/5.6 in my opinion is not supposed to be used with any teleconverter due to the fact that the image quality isn't good with a tc. Also your maximum aperture will now be f/8. If it was the 400mm f/2.8 version then the tc might be a good option, but with the f/5.6 version, I wouldn't use it.rbadiolahttps://www.blogger.com/profile/01706706959992546284noreply@blogger.comtag:blogger.com,1999:blog-1199046130419769252.post-72476301784829912792013-12-05T19:42:27.540-06:002013-12-05T19:42:27.540-06:00Hi, I see you have the Kenko 1.4 and the Canon 400...Hi, I see you have the Kenko 1.4 and the Canon 400 5.6... Have you used these together successfully? I have the 400-5.6 and have been tempted to buy the Kenko TC, but I find so much conflicting info. Some say they'll work together, some say you have to tape the pins, and still others say don't bother with it. What's your take?<br /><br />Thanks,<br /><br />Bill<br />billweckel.comBill Weckelhttps://www.blogger.com/profile/18262151160201109185noreply@blogger.com