Since Canon will be bringing out firmware in April which will allow a 5DMkIII to AF with an extender at f8, do you believe the AF will be as fast and accurate as that of a 1D series?
And will it be better than the results you can get now with taping the pins?
Except for the 1D X all 1D series cameras up this point can only AF with the center AF point, I am taking my chances with and putting my bet on the 5D Mark III, which has 41 cross-type AF points. IMHO, it would be as good if not better but you will get more AF points .
AGeoJO wrote:
Except for the 1D X all 1D series cameras up this point can only AF with the center AF point, I am taking my chances with and putting my bet on the 5D Mark III, which has 41 cross-type AF points. IMHO, it would be as good if not better but you will get more AF points .
Do you have any idea how well the 5DMkIII will AF now with the pins on a TC taped?
Tony,
My taped Canon 2X TC Mark III doesn't work with any f/4.0 lens. I bought a Tamron 1.4X TC that I taped for the purpose of combining that with my Canon 1.4X TC Mark III. The combo will give me a 2X multiplier but it would fool the camera of thinking that the light loss was only 1-stop, instead of 2-stop. The AF speed was OK but really not to write home about. I am sure it has more to do with the light loss at 2X. But that's the only combo that can give me the 2X at this point. With the upcoming firmware update in mind, I am really not interested in keeping that Tamron TC. I am confident that my Canon 2X TC Mark III after the firmware update will perform better than the combo of Canon and Tamron TCs.
Tony,
If you have a Canon 1.4X Mark II or III, I can sell you my Tamron Pro DG TC . I will include the tape in there, too . The combo of both TCs should work on the 500mm f/4.0 Mark II on the 7D. I am not sure of the speed and reliability of the combo though on that camera but it won't hurt to try it. Or buy a 5D Mark III but you loose a little reach there but gain a little more IQ...
I have used the 5D3 with a Kenko Teleplus Pro 300 2X with taped pins. Used center point with 600/4, AF was what you'd expect- ok for still subjects, and occasional hunting in Servo with low (relatively speaking) light or with a less-than-contrasty subject. If I locked on, it could track well enough if subject movement wasn't too erratic and there were no obstacles.
I'm sure some of this is a function of the TC not being the highest quality. I'm looking forward to the firmware and trying this with a Canon 2X.
AGeoJO wrote:
Tony,
If you have a Canon 1.4X Mark II or III, I can sell you my Tamron Pro DG TC . I will include the tape in there, too . The combo of both TCs should work on the 500mm f/4.0 Mark II on the 7D. I am not sure of the speed and reliability of the combo though on that camera but it won't hurt to try it. Or buy a 5D Mark III but you loose a little reach there but gain a little more IQ...
Thanks, but I only have the Canon 2x III. Already have a Kenko C-AF 1.4x, which works very well.
Maybe will wait until April, when 5D III prices will still be lower and firmware update will be available, or maybe even a 7DII with same AF capability as 5D III.
Imagemaster wrote:
Thanks, but I only have the Canon 2x III. Already have a Kenko C-AF 1.4x, which works very well.
Maybe will wait until April, when 5D III prices will still be lower and firmware update will be available, or maybe even a 7DII with same AF capability as 5D III.
Already given up on the 6D, you know with it's much lower price.
I am using the Tamron-F 1.4X with the 5D III & 400mm F5.6
It works great for still shots; and most BIF situations. Works fine until 5D III firmware allows use of Canon 1.4X III
AGeoJO wrote:
Except for the 1D X all 1D series cameras up this point can only AF with the center AF point, I am taking my chances with and putting my bet on the 5D Mark III, which has 41 cross-type AF points. IMHO, it would be as good if not better but you will get more AF points .
Reading the 1DX manual, lenses that become f8 with a tele-converter fall into group H which uses the center cross point only for one shot but can add 4 assist points for AI focus. The 5D3 group H description (which is still pre f8) does not describe the assist points for AI focus. I hope the firmware update will add this capability as well. I haven't seen a pre-update 1DX manual to see if the assist points were added with the update.
The 400 f5.6L lens belongs to group E (along with the 100-400) which can use the center 21 cross points. The outer 40 are useable, but linear, for lenses in this group.
.
. I will include the tape in there, too 
. The combo of both TCs should work on the 500mm f/4.0 Mark II on the 7D. I am not sure of the speed and reliability of the combo though on that camera but it won't hurt to try it. Or buy a 5D Mark III but you loose a little reach there but gain a little more IQ...
If so, what makes you think the 6D will have the same AF capability as the 5DMkIII, especially with TC's?
