Amazon Kindle Unlimited Offer: 1-Month For FREE!

1d mk3 AF Adjustment


PeteBrown 12 80 England
25 Apr 2009 6:02PM
Can anybody tell me if you can adjust the forward backward focussing on the 1d mk3 when using a sigma lense or if that adjustment only works with canon lenses.
thinking of getting the sigma 50mm 1.4
Munro 13 45 United Kingdom
25 Apr 2009 6:55PM
I have only just finished carrying out the adjustments for my lens' on my 50D. This included a Sigma 10-20. I understand that this facility is the same for higher spec bodies.
colin beeley Plus
18 1.2k 10 England
25 Apr 2009 7:14PM
why buy canon eos 1d mk 3 & put crap on front of it ??????????????
PeteBrown 12 80 England
26 Apr 2009 12:41AM

Quote:Why buy canon eos 1d mk 3 & put crap on front of it ??????????????


only need it for the odd low light pic not willing to spend 1200 notes on the decent canon lense, lets face it the sigma 50mm is better than the canon 50mm 1.4. i have 17-40l 24-70l 70-200l 100-400l i think thats enough quality dont you?????????????????????????? maybe you could be slightly more constructive
colin beeley Plus
18 1.2k 10 England
26 Apr 2009 3:24AM
stigma better than a canon read this then keep a eye here don't know where you got £1200 from. you wan't a quality lens get a canon 300 2.8 L IS !
XxPaulxX 15 265 England
26 Apr 2009 6:52AM
That's an FD lens in your link Colin.
colin beeley Plus
18 1.2k 10 England
26 Apr 2009 7:16AM
try here
magnus 16 661 5 United Arab Emirates
26 Apr 2009 7:23AM
Pete - Possibly you are thinking if the 50mm 1.2L?
geoffash26 17 2.5k United Kingdom
26 Apr 2009 8:10AM
This should help

the one at the top should answer your question
PeteBrown 12 80 England
26 Apr 2009 9:01AM

Quote:Stigma better than a canon read thisthen keep a eye here don't know where you got £1200 from. you wan't a quality lens get a canon 300 2.8 L IS !


1200 notes would be the 1.2 cant afford that now but ive read reviews that state the sigma 1.4 is better than the canon 1.4
strawman 17 22.2k 16 United Kingdom
26 Apr 2009 10:16AM
Colin read this as an example before you go knocking the sigma without every trying it. Also read the photozone review as well. both the Canon and Sigma score highly recommended, with the sigmal looking like it has the optical full frame performance edge.

I can think of a few sigma lenses that are better than canon ones, some that are just as good and some that are worse. It is clever to pick the best from the range of suppliers.
colin beeley Plus
18 1.2k 10 England
26 Apr 2009 10:54AM
didn't like the sound of this " highly recommended but watch out for focus accuracy problems".
strawman 17 22.2k 16 United Kingdom
26 Apr 2009 8:38PM
But if you have the 1D MKIII with its AF adjust you can overcome that Smile
elowes 17 2.8k United Kingdom
26 Apr 2009 8:52PM
I have also read of the problems with inconsistent focusing though the image quality seems to be very good.
LenShepherd 13 4.4k United Kingdom
28 Apr 2009 8:12PM

Quote:But if you have the 1D MKIII with its AF adjust you can overcome that

Sort of on topic during a long period of convalescence I started comparing complaints about Nikon with posted images versus AF targets were Nikon said AF could mis- focus.
I decided to persevere and it was not until image 324 that I saw a complaint with a fully reliable AF target.
I was fully recovered before image 150 - and still no complaint supported using a good AF target!
On the one hand this implies about 99.3% of complaints are user error - but on the other hand experienced photographers generally recognise when equipment is faulty without posting on the web so 99.3% is not representative of all levels of skill.
Over the last 3 years I have encouraged over 80 Nikon users and 15 Canon users re test with fully reliable AF targets - and in every case front or back focus has turned out not to exist when using a high quality AF target.
Here is a quote (I have added the bold text) from the number 1 at Canon USA
Chuck Westfall “I recommend using a flat, detailed target parallel to the focal plane. After reading through the PDF linked from your message, it appears that the author has missed a major point, i.e., any individual focusing point in a digital SLR is much longer than the simple line he is using on his chart.
The nature of the AF sensors used by EOS digital SLR’s as well as those from other manufacturers is that they perform most reliably when the entire length of the focusing area sees readable detail.This condition is not satisfied by a thin line on a piece of paper. It's OK to include an angled chart in a test photo. In fact, Canon Factory Service Centers always do this. But the test target is always separate from the angled chart, and parallel to the camera's focal plane”.
***
I am not saying front or back focus does not occasionally happen - but when it is perceived to be an issue detailed investigation usually identifies a less than ideal AF target and not the lens or camera body to be the cause of the problem.

Sign In

You must be a member to leave a comment.

ePHOTOzine, the web's friendliest photography community.

Join For Free

Upload photos, chat with photographers, win prizes and much more.