canon 1.4x converter III on canon 400 mm 5.6 lense (Page 2): I could be wrong, but it is the bump to f8.0 that disables the AF, think that would apply to the fixed 400 also.

lbrandt79 Loc: League City, Tx.

BigBear wrote:

Hondo did not mention the 100-400 lens.
There is a big difference between the 400 5.6 and the 100-400.
Which one is the subject ??

I could be wrong, but it is the bump to f8.0 that disables the AF, think that would apply to the fixed 400 also.

BigBear Loc: Northern CT

lbrandt79 wrote:

I could be wrong, but it is the bump to f8.0 that disables the AF, think that would apply to the fixed 400 also.

That is likely the case, I was just questioning how the subject changed between lenses and I wasn't clear with my response as it was BC (before coffee).

I have the 100-400 and the AF does not work through the view finder, but does work in LiveView.

Thanks

lbrandt79 Loc: League City, Tx.

BigBear wrote:

That is likely the case, I was just questioning how the subject changed between lenses and I wasn't clear with my response as it was BC (before coffee).

I have the 100-400 and the AF does not work through the view finder, but does work in LiveView.

Thanks

Thanks, I did not know that, just got a Canon 6D a few months ago, need to try that.

papakatz45 Loc: South Florida-West Palm Beach

gregoryd45 wrote:

I have a canon T1i, I don't believe canons 1.4X or 2X was intended for use on the 100-400, they do not work nor were they ever intended to. The canon extenders were made for certain canon lenses, it is simple to go to canon and find out. The tamron has no trouble workng with my canon 70-210mm, 100-300mm and 100-400mm

Both the 1.4 & 2 work fine on the 100-400. You do have to manual focus.

imagemeister Loc: mid east Florida

Inexplicably, some people say they they can autofocus at F8 on Canon crop frame bodies - IF indeed they can, it is by some quirk of fate with their particular camera body/lens combination.....!

imagemeister Loc: mid east Florida

hondo wrote:

canon 400mm 5/6 &canon exst. 1.4x cannot auto focus ..
do you have to use manual focus on this setup ..

if so . what other lense can i use to get auto focus..
with a long lense .. would the 300mm f/4 work & mantain
auto focus.. on the 7d... i would appreciate any suggestions.. thank you very much ..

[hondo] ron brown . penn. in del county ..
frequint john heinz wildlife preserve ..

Yes, other than the 150-500 and 150-600 lenses, the 300 F4 W/1.4X is your best hope - along with some special cropping software.....

Swamp Gator Loc: Coastal South Carolina

imagemeister wrote:

Inexplicably, some people say they they can autofocus at F8 on Canon crop frame bodies - IF indeed they can, it is by some quirk of fate with their particular camera body/lens combination.....!

I think some people have been indicating that they retain AF when using the Tamron 1.4 but not with the Canon.

imagemeister Loc: mid east Florida

hondo wrote:

i can use it without the conv.. just thought i might get
a little more reach.. takes great pics but there is no . i.s.
its getting hard to hold steady.. i use a tripod but hate to use it .. thanks again ....hondo ..

Yes, for most subjects, you would do well to have and correctly use a well articulated monopod ..........

imagemeister Loc: mid east Florida

Swamp Gator wrote:

I think some people have been indicating that they retain AF when using the Tamron 1.4 but not with the Canon.

Yes, the Canon TC will NOT ALLOW you to AF - the Tamron will ALLOW it - but then the question becomes - Will your camera body and prevailing light levels actually accomplish it ?

Izza1967 Loc: Bristol, England

I did see a post that someone with an older 30D could get autofocus with a 1.4x on a f/5.6 lens ( making f/8) but not on newer crop bodies

QuickShooter101 Loc: East

I have a canon 7D and I use Tamron 1.4 SP AF Pro . I can auto focus , but I have to use the Widest AF area select mode . Can't help you with why the canon 1.4x wont ,Tommy

davidrb Loc: Half way there on the 45th Parallel

hondo wrote:

canon 400mm 5/6 &canon exst. 1.4x cannot auto focus ..
do you have to use manual focus on this setup ..

if so . what other lense can i use to get auto focus..
with a long lense .. would the 300mm f/4 work & mantain
auto focus.. on the 7d... i would appreciate any suggestions.. thank you very much ..

[hondo] ron brown . penn. in del county ..
frequint john heinz wildlife preserve ..

The problem is that most Canons will not AF above f/8.0. There are ways around this limit under certain conditions. I find I am able to auto focus above f/8.0 by using live view and single/center point focus. When using a Canon 2x T/C on an EF 500mm f/4.5L the live view method works perfectly. I have used this to shoot hummers, and have had some success. I have not tried this on a hawk in pursuit, but I know I can rely on it when I have tried it under a more controlled environment.

Swamp Gator Loc: Coastal South Carolina

imagemeister wrote:

Yes, the Canon TC will NOT ALLOW you to AF - the Tamron will ALLOW it - but then the question becomes - Will your camera body and prevailing light levels actually accomplish it ?

Right but not only that but if you do retain AF how *fast* will it be?!
I mean there is AF and there is AF.
Relatively slow speed AF my be fine for something just sitting there, but if you are out in the field and a peregrine suddenly comes jetting in at you and you have a millisecond to react, bring up the camera, and get off one frame, any possibility it will be sharp?!
I can and have done that with my current combo of a Canon 300 f4 and the Canon 1.4 on a 7D. AF is fast and accurate.
I'm betting that would not be the case using a Tamron on a 400 5.6.

Just for laughs, here's my post for today featuring a spoonbill fight from last night. Photos taken using my 300 and 1.4

http://phillanoue.com/2014/09/09/well-that-had-to-hurt/

jboy24 Loc: Downey Ca,

gregoryd45 wrote:

You will love the 300 f/4, it is a great lens, good luck

The 400 5.6 is a great lens it also it is very sharp, had the 100-400 then got 400 prime and have never been happier it is a great lens.. That said, had the 100-400 and the 400 prime on a 40D with a Tamron SP version 1.4 conv and the camera would not auto focus. I just got a 7D and also a canon 1.4II, will try the combo soon...from what I've heard crop bodies wont AF @ f8, just the 5D and 1 series bodies. Now I have also heard that a 400 5.6 on a 7D with a Kenko 1.4 DG converter will auto focus.

SharpShooter Loc: NorCal

With a Canon 100-400+1.4x you will retain AF if you tape the pins.
With a Canon 400 I don't know, as I don't own one.
I have heard a rumor(again I didn't own one) that even if you tape the pins on a Canon 1.4 mklll(vs 1.4mkll) that it will not work, but thats only a rumor.

The AF on the 100-400 is plenty good enough with the pins taped.

I would probably rather use a bare canon 400 vs a 300+1,4, as you just don't gain a lot. Only 30mm on a crop camera and 20mm on a FF. ;-)
SS