My 24-70 was complete trash...

Assumed it was my lack of talent, I tried for five months to get the hang of it. I took it to the Canon repair center on Wednesday, picked it up on Friday, shot it all day today, it's now everything I hoped it would be.

I highly encourage anyone who is disappointed with this lens to get it repaired!

Oh, I may be joining you. I am really really really tired of the CA on mine. Had assumed it was me, but now I don't want to use it unless there is zero chance of anything bright in the photo.

Can you tell me, specifically, what made you finally decide it was crap?

alintx wrote in post #11964809
Oh, I may be joining you. I am really really really tired of the CA on mine. Had assumed it was me, but now I don't want to use it unless there is zero chance of anything bright in the photo.

Can you tell me, specifically, what made you finally decide it was crap?

Front or backfocus issue, when you use MF it's perfectly fine.

alintx wrote in post #11964809
Oh, I may be joining you. I am really really really tired of the CA on mine. Had assumed it was me, but now I don't want to use it unless there is zero chance of anything bright in the photo.

Can you tell me, specifically, what made you finally decide it was crap?

Strangely enough it was getting my 70-200; it took great pictures on day one, just drove home what an L lens should do.

KY707 wrote in post #11964817
Front or backfocus issue, when you use MF it's perfectly fine.

It did both front and back focus depending on the focal length and seemed to have "dead spots" that moved around depending on focal length. It is now dead on sharp across the entire frame and at all focal lengths and apertures, even 2.8.

rockygarcia wrote in post #11964719
Assumed it was my lack of talent, I tried for five months to get the hang of it. I took it to the Canon repair center on Wednesday, picked it up on Friday, shot it all day today, it's now everything I hoped it would be.

I highly encourage anyone who is disappointed with this lens to get it repaired!

Seconded.

Focus in mine was hit or miss. I tried for a couple of months to overcome what I thought was lack of talent also.

Sent it to Canon they replaced defective parts (Chassis and PWA).

Came back sharp.

rockygarcia wrote in post #11964860
It did both front and back focus depending on the focal length and seemed to have "dead spots" that moved around depending on focal length. It is now dead on sharp across the entire frame and at all focal lengths and apertures, even 2.8.

Post some pics of 100% crops if you don't mind.

Did you have it micro-calibrated?

I'll second that - PIX!!!

Jmantyger wrote in post #11964888
Seconded.

Focus in mine was hit or miss. I tried for a couple of months to overcome what I thought was lack of talent also.

Sent it to Canon they replaced defective parts (Chassis and PWA).

Came back sharp.

For info - PWA? Googled, but the only photographic abbreviation I can find is Pano Wide Angle. No big deal, just nosey / curious.

xhack wrote in post #11971503
For info - PWA? Googled, but the only photographic abbreviation I can find is Pano Wide Angle. No big deal, just nosey / curious.

phlange wing adapter
photo weighted accelerometer
painful wince aperture
price will aggregate
pitiful wheel adhesive

I too am curious......

rusty.jg wrote in post #11971816
phlange wing adapter
photo weighted accelerometer
painful wince aperture
price will aggregate
pitiful wheel adhesive

I too am curious......

I gotta think he or Canon meant PCB

I rented the 24-105 F4 a few weeks ago, and it was soft. I wasn't impressed at all. Could have been a bad lens.

My experience with 24-70L:
1) MA on zooms is a waste of time. You can't nail it across FL range.
2) Posting here is not going to fix the issue, you need to contact Canon
3) Canon fixes this for free if under warranty or for a very reasonable price if out, may take a couple of trips if problem is not trivial. Don't give up if it's not fixed first time, be persistent. Consecutive trips are on Canon, they provide shipping label.
4) Most importantly, be specific as possible with the problem description, sample pictures can help too, just burn some on CD and ship with the lens
5) Canon adjusts lenses to "standard" camera body, so if yours is off, you will see the problem even after calibration. Send the body along if any doubts.

Sdiver2489 wrote in post #11971935
I gotta think he or Canon meant PCB

Actually I meant PWA: Printed Wiring Assembly

To me, PCB is a Printed Circuit Board: Raw Board without components installed.

Or at least it does to me and the industry I work in.

Jmantyger wrote in post #11974026
Actually I meant PWA: Printed Wiring Assembly

To me, PCB is a Printed Circuit Board: Raw Board without components installed.

Or at least it does to me and the industry I work in.

I'm more use to hearing PWB

http://www.acronymfind​er.com/PWB.html