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Sigma 120-300mm F2.8 on 20D

chinny 13 492 United Kingdom
21 Jan 2006 8:05AM

I have just purchased a Sigma 120-300 F2.8 EX DG, sometimes when I have the focus mode on Al servo it wont let me depress the shutter? It works fine in the other modes I lost a few shots today because of this problem, have you heard of this problem? I also had an error 99 come up, but I was using a canonx2 converter.

Thanks Chin

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BOB S 16 2.6k
21 Jan 2006 8:14AM
With the 100-400 LIS in the bag what is the point of this lens ?

chinny 13 492 United Kingdom
21 Jan 2006 8:32AM
420mm @ F4 and 600mm at F5.6, both with AF yes the Canon is a great lens but its a little slow for what I want it for, I take it you dont know the answer to my question? but hey thanks for your interest ?? :O!
IanA 14 3.0k 12 England
21 Jan 2006 8:46AM
Many of Sigma's lenses don't work properly on converters other than their own. Having said that, I have a 120-300 with an EF11 1.4x on and it works fine on a 300D and 1D!

Quote:With the 100-400 LIS in the bag what is the point of this lens ?

It's sharper!

chinny 13 492 United Kingdom
21 Jan 2006 9:05AM
Ian, thanks I did have the Sigma x1.4 on at the time of the Al Servo fault, it was a very bright day so I don't think the camera had problems with light.
IanA 14 3.0k 12 England
21 Jan 2006 9:47AM
As it is a new lens, you could try giving the contacts a clean ( a drop of Cigarette lighter fluid on a cloth works well).
See if that helps.

chinny 13 492 United Kingdom
21 Jan 2006 10:57AM
Cheers Ian, I will do that but I'd still like to find out why its not locking on Al servo mode, like i said its not doing it all the time, I thought Al servo mode you can fire at will? nothing stops the shutter from operating? Am I wrong ?

Cheers Chinny
Burgy_Tog 14 634 United Kingdom
21 Jan 2006 11:23AM
it depends on the camera that you are shooting with, and how you have the custom functions set up.

There is a shutter/AF priority CF on the EOS1D(s), 1D(s)mkII and II N, which determines which takes priority AF or exposure, I haven't got mine in front of me, but a referral to the manual will point you in the right direction.

I also have the 120-300 and it is a cracking piece of glass, my 100-400 was retired after it's arrival, it works well on the 1d and the mkIIn
chinny 13 492 United Kingdom
21 Jan 2006 11:40AM
Thanks Paul, I like you will be thinking of retiring the 100-400, I cant have that lying around the house not being used it would be better of with pennies in my bank. thanks for the advice :o)
chinny 13 492 United Kingdom
23 Jan 2006 10:50AM
New problem to this thread: When I am in Al Servo Mode the camera shutter will not take an image, this happens occasionally, if I keep my finger on the shutter the camera then releases the shutter (relucantly) and then comes up with an error code99? So what is that all about ?? I have cleaned the contacts and rebooted the camera and taken a couple of hundred shots around my house(OK so now the camera is worthless) and I cant trip it up?? Do you think the problem was dirty contacts? This lens is BRAND NEW !!

chinny 13 492 United Kingdom
26 Jan 2006 8:15AM
Update on this thread: The A1Servo mode works fine on the lens with no Convertors, when I attach the x1.4 its ok but struggles, if I attach the x2 (not the same time as my 1.4) it finds it very difficult to use A1 Servo, but AF is spot on and works as it should do! Time to sell my 100-400 LIS I feel !!


Cheers Chinny
chinny 13 492 United Kingdom
6 Apr 2006 10:52AM
Any New owners of this lens? can you update this thread? I still have the problems !! to get round it I just dont use AI Servo ! very frustrating ! looks like its going back to Sigma ! (3 weeks without it !!!)

Thanks Paul
jk 16 36 England
6 Apr 2006 11:33AM
Hi Chinny
I get an err message on the d100 when the lens is stopped down to f16 or smaller, but if I have either of the sigma converters fitted there is no problem what so ever.
On the D2Hs it works right through the range !. I put it down to the fine tolerence on the stop down mechanism in the D100 camera body it must be right on the limit, this is the only lens I've had a problem with on the d100.
Hope this helps.
MeanGreeny 12 3.7k England
6 Apr 2006 2:27PM
With so many other people helping out what is the point in this answer ?
klewis 14 1.9k 1 United Kingdom
6 Apr 2006 3:08PM
Chinny I have the same combo the 20D and Sigma 120-300f2.8 and I have has the same fault ie shutter wouldnt actuate. Remedy was turn the camera off and back on. It still does it from time to time but I havent figured out the reason but it works fine on the 1DMkII which is now where is spends most of its time

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