I have a 24-70mm f/2.8L lens and am finding that it is not as sharp as i'd expect. I'm sure it's me and not the lens so hoping someone can help me understand what i'm doing or not doing correctly.
I'm attaching a picture as an example...hand held...here are the settings:
EF24-70mm f/2.8L II USM
1/640 sec; f/2.8; ISO 400
Shutter priority; Spot metering
shot with 70D
when you zoom into the tree it is cleary not in focus/sharp ;(
I've tried at differen shutter speeds but still having the same issue... going to try different apertures next...
when i hand take the shot i see the confirmation (ie it beeps and is red) - to be honest not sure if it is when using remote - ie i don't recall if i heard the beep..... i'm assuming i should even with a remote? right? and yes it is on one shot and the center AF is used.... i didn't change anything on the 70d so should be at factory defaults but will check or at least reset to factory defaults. I've had the T1i for a long time but do not recall changing any settings that may impact the shot but will reset to factory defaults too .... too dark now to redo with natural light so will have to try again tomorrow....
i'm also going to re take the shots using my kit 18-55mm that came with the T1i and my sigma to see what the heck is going on - ie is it only that one lens or all - if all then it's an camera issue - i'd think.... but can someone confirm if that test sheet is a good test for any lens at about 10 feet set to largest aperture? if anything at least it will test if focus is bang on or not right? will try using ISO 100, f/4, 1/1600 if light permits... will recheck Tim's list ot ensure those are the correct corresponding values...
You must have focus confirmation one way or another.
The sample shots you posted are, frankly, horrible. It looks like the lens never focused at all, in the first place.
It sounds like you are doing everything correctly. But not actually being there I can not 100% confirm it.
I am having a hard time believing a Canon 24-70mm f2.8 L lens is faulty. It is assembled by the top, best, technicians Canon has. Each one is individually inspected and tested by the best. But as the saying goes, "Anything made by the hand of man can and will fail."
i just took some more shots....what i'm finding is that at 5 feet or less the lens is sharp... then when i move to 10 feet it starts to not be in focus ..... at 10 feet i'm using a tripod and a remote....
having said that at 5 feet or less that center text is ALMOST there - meaning it's still a tiny bit off... but the numbers down the side are in focus perfectly.... that is at f2.8... i had to use 1/200 and ISO of 200 or 400 ... but that is more becuase of lighting - i just do not have a spot in doors that is bright enough to go to ISO 100 and i can't go outside - it's way too cold ;(
i know all lenses have a workable distance - that they should be used for - how to i confirm what that distance is for this lens?
"i know all lenses have a workable distance - that they should be used for - how to i confirm what that distance is for this lens?"
Maria you are beginning to lose me here? What do you mean? That lens should be crystal sharp at all distances from min focus to infinity.
Do one last thing for me. Switch off auto focus. Set the camera on the tripod. Manually focus while you are looking through the view finder. Focus on the test spot and do some shots. If it looks to be in focus in the viewfinder it should be in focus period. Use the screen (CRT), not a printer, to view the result.
At this point you don't know anything. Whether the lens is good or the camera is bad or whatever else.
I am banking on the lens being fine.
OK, I am so glad you got another's opinion. I am so glad and not unexpectedly, the 24-70mm f2.8 is good.
But I disagree on the keeper rate. If I shot with the same expectations as he gave you, I would be out of business in short order.
As I told you way back I am not a fan of any of the xxD cameras. But in your case I believe some OTJT is in order. Go out and use it. Shoot a lot. Shoot everything. Learn that system and you will be fine.
This is my personal preference and not based on the written specs.
But I wouldn't buy either, a 6D and/or a 70D. However, if given the choice I would go for the 6D in a heartbeat. As stated I am not a fan of any of the xxD cameras. I am not a big fan of the 6D either mainly because it has features I don't have need for and the biggest deal breaker, it is not a 5D.
Now this is me but I would prefer a good used 5D Mk II over either the 70D or 6D.
For you, however, the 6D is full frame and is going to open a whole new world for you. The 6D is Canon's idea of an enthusiasts level full frame camera, essentially a APS-C full frame version.
Bottom line, a 6D is a 70D in full frame clothes!
Thanks again.... any idea if my Sigma AF 70-300mm f/4-5.6 APO DG Macro for Canon will work on the 6D?