100-400 1.4x tc auto focus elan 11e

[brian_reynolds1]

I am trying to deside which lens to get the 100-400 L or the 300 f4L. my question is will my auto focus work using a tamron 1.4 pro T/C on the 100-400 4.5 5.6 L. Canon tec.suport told Me that it would with my elan IIe body although on the specs for the 1.4 T/C said otherwise.One other thing the T/C worked with my 100-300 4.5-5.6 lens. So what do you think? Personal experience would be best.While I'm at this has eny one ever had problems with the auto focus with the 70-200 F4.L locking on to the subject.

[bobatkins]

It shouldn't work but it might! The IIe is only designed to AF at

f5.6, not f8 (the 3 and 1v AF at f8). However I assume the Tamron TCs

still don't report the correct aperture to the camera body so it will

attempt AF. The result is you may get AF but it probably won't be very

good.

 

<p>

 

The 3004L will AF properly (accurate and positive AF lock), especially

when used with the CAnon 1.4x TC. With third party TCs it will

probably do OK too.

[gary_russell]

Brian:

 

<p>

 

My 100-400 L will not AF with the Tamron 1.4X Pro (white one) on an

EOS 5 (A2e), the combination does work with a 1v however. Excluding

the protruding element, I think the Tamron is set up to work just

like the Canon OEM extender.

[les_gyug1]

You'll probably have to try it. I have an older Tamron 2x extender

that does not send the aperture data, and consequently will "attempt"

to autofocus at equivalent f11. Really it just ends up hunting unless

you happen to be focusing on a straight black-and-white high contrast

edge (which is about how often?). Tamron may have updated their

contacts in the new pro series to feed the real aperture, but I

haven't tried one.

[brian_reynolds1]

I had the camera shop to get one in for me to try.it did not work.I

was hoping that it would with ideal lighting.I think that my best bet

will be the 300F4 I really don't want to get a prime lens but without

a good alternative that is about it. Maybe we should all gang up on

canon to add a usm to the 100-300 L lens at a resonable cost.I would

be happy with that.(FAT CHANCE) at least I know that my images will

be better this sping. I use the long lens to photograph Bald Egales

atlake monroe during the nesting seson.well,anyway thanks everyone

for your imput it was helpfull And maybe someone else will also

benafit from this.

[isaac sibson]

Why don't you just buy the 100-400? At the long end, it is almost as

long as the 300+TC. Then, if you later upgrade to an EOS 3 or 1V, or

similar, you can get the Canon 1.4X TC and it will AF properly with

the centre point.

 

<p>

 

I have the 300 F4L IS, which is very nice indeed, and works very

well with the 1.4X TC, but it seems you want a zoom.

 

<p>

 

I have never had any probs with the AF on my 70-200 F4L. If

anything, it's always been the best of my lenses in this respect

(alongside 24-85USM and 300 F4L IS USM), and works well with the

1.4X TC also. I suspect the body has rather more bearing on this

though.

[larry h.]

The Tamron Pro 1.4x does not autofocus with the 100-400 IS zoom.

With lenses that have the extra three connections in them (L

telephotos only? I'm not sure), the Tamron Pro TCs send the proper

effective f/stop to the camera body. Thus, when you view through the

lens + TC combo, you will see the correct effective f/stop. With an

Elan IIE which cannot AF at f/8, the camera body shuts off AF. This

is first hand experience.

 

<p>

 

Interestingly, with lenses w/o the extra three connectors, such as

my 85mm/1.8, the TC does NOT send the camera the correct f/stop

info. When I connect this combo, the camera shows an effective

aperture of f/1.8 instead of f/2.5. The lack of the three extra

connectors (leads, or whatever they are called) is the only

difference I can attribute this behavior to.