I have focusing issue..please help !!!

I dont know where to post this but if anyone know what the problem is, please tell me... i dont know if it's my 5d or my 50mm 1.4 lens.

I always focus on her face and her eyes but most of my pictures, when i upload it on my computer, looks like it's focused somewhere else.

for example, this picture, the leaves underneath her chair is in focus, while her body is not.

http://photographylife​.com …dslr-for-autofocus-issues

http://www.lensrentals​.com …010/11/how-to-test-a-lens

Are you selecting a single AF point, or are you letting the camera decide from any of the ( 9??) AF points?

If the Camera is doing the decision making, that could be your issue. Usually, the camera just selects the AF point on the area that is closest to the camera. This leaves no actual control over composition and focus.

I'm trying to learn this lens as well and have had similar issues. After doing some reading on it I learned that the sweet spot for sharpness is more in the f 2.0 and up area. I don't see your exif data so I can't say for sure if that is your issue but it definitely helped me. I've also recently recognized that I've become too dependent on the IS on my other lenses. This lens does not have IS so either use a tripod or get your shutter speeds up.
I'm a newbie with this lens so take it with a grain of salt.

melvinm wrote in post #15673993
http://photographylife​.com …dslr-for-autofocus-issues

http://www.lensrentals​.com …010/11/how-to-test-a-lens

thank you melvin.. good stuff !!

CyberDyneSystems wrote in post #15674042
Are you selecting a single AF point, or are you letting the camera decide from any of the ( 9??) AF points?

If the Camera is doing the decision making, that could be your issue. Usually, the camera just selects the AF point on the area that is closest to the camera. This leaves no actual control over composition and focus.

yes im selectiong a single AF point, and always put it on the eye closest to me.

jcammn wrote in post #15674998
I'm trying to learn this lens as well and have had similar issues. After doing some reading on it I learned that the sweet spot for sharpness is more in the f 2.0 and up area. I don't see your exif data so I can't say for sure if that is your issue but it definitely helped me. I've also recently recognized that I've become too dependent on the IS on my other lenses. This lens does not have IS so either use a tripod or get your shutter speeds up.
I'm a newbie with this lens so take it with a grain of salt.

Shutter speed was pretty fast so i didnt really need a tripod, and above 2.0
1/1600 ƒ/2.5 ISO 250

It appears that the chair back rail is sharp and thats behind the child. So it points to subject movement. But I'd stay away from f/2.5 and move to something that will give you more DoF just in case, f/5.6 or f/8 for example.

Lowner wrote in post #15675802
I'd stay away from f/2.5 and move to something that will give you more DoF just in case, f/5.6 or f/8 for example.

what is the point about paying more and buying 1.4 lens and use them in 5.6-8 ?


ps: I´m having a similar issue with my t4i and 50mm 1.8 mine seems to have front focus issue, even using around 2.5-2.8, central point, one shot, focusing the eyes

Brupikk wrote in post #15675971
what is the point about paying more and buying 1.4 lens and use them in 5.6-8 ?

Just because my car will do 130mph, does not mean I'm obliged to break the law!

Have a good close look at some DoF charts. In particular note how extremely "thin" the focal plane is at the wider apertures. Now be aware that the nice sharp focus boxes are not real, the actual AF points are in reality big blobs only vaguely in the same area. Add these two things together and think about what you are trying to achieve with any picture before deciding on things like aperture/shutter speed and ISO.

I was finding the same with my 50mm 1.8 lens. I am use to half press shutter to get lock then take pic, trouble I found was because you have such a shallow dof you only have to move or subject move mm's and the sweet spot is not in the right place.
I find now shooting at f2.2 and just pushing shutter down fully has sorted it, as once it locks on it takes the pic sraight away. No time for movement.

Have a go and see how you get on.

What was your focal length? If you were close to the baby, you might not have had enough DOF for the distance.

BTW, I use my 50mm/1.4 for almost all of my newborn sessions and it is so crystal sharp, Sadly, my hubby dropped it on the driveway and it has been to the service center twice in the past 10 days. If they can't fix it, I will definitely buy another one.