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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 11 Jun 2012 (Monday) 09:55
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Question about 50mm f1.8

 
chongkiat
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Jun 11, 2012 09:55 |  #1

Okey guys , after owning the 50mm f1.8 for quite some time , today suddenly give a test to my lovely Tamron 17-50mm f2.8, 85mm f1.8 & 50mm f1.8 AF test

When doing the test , i mount the my 60D on tripod to avoid any hand shake , so after done the tamron and the 85mm f1.8 out , i found this two lens is really great in focus even at wide open , happy with this 2 lens

So when i pick up my 50mm f1.8 to doing the test , until today only i found that , IF we focus on the same thing , keep on repeating half-press the shutter , the focus ring will keep on turning Clockwise and counter-clock wise by ABIT......(mean if u shooting the same image , it will turn 2 different DOF , see the picture below)

Mean

When half press > It will Focus > Release Shutter and Half Press again(if u focus on the same thing , the focus ring SUPPOSE not MOVE anymore, BUT the focus ring will turn Clockwise Once , if u repeat "release and PRESS shutter Half way down" , the focus ring will turn Counter-Clockwise)

Here is the picture sample, 60D mount on tripod , FOCUS on the same thing which is the "AMD 64 Atholon"

First Picture !!

IMAGE NOT FOUND
IMAGE IS A REDIRECT OR MISSING!
HTTP response: NOT FOUND | MIME changed to 'image/gif' | Redirected to error image by FLICKR

IMG_0824 (external link) by Lau test (external link), on Flickr

Second picture , On the same spot , focus on the same thing
IMAGE NOT FOUND
IMAGE IS A REDIRECT OR MISSING!
HTTP response: NOT FOUND | MIME changed to 'image/gif' | Redirected to error image by FLICKR

IMG_0825 (external link) by Lau test (external link), on Flickr

Crop out to see the DOF clearly
IMAGE NOT FOUND
IMAGE IS A REDIRECT OR MISSING!
HTTP response: NOT FOUND | MIME changed to 'image/gif' | Redirected to error image by FLICKR

problem (external link) by Lau test (external link), on Flickr

See the different?? my 60D is mount on the tripod , focus on the "AMD 64 Atholon" Logo , i would like to know ur 50mm f1.8 got such problem or not?


Please help me check out guys !!!

Canon 60D Gripped | Canon 17-55mm f2.8 IS USM | Canon 85mm f1.8 USM | Canon 580exII
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GregoryF
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Jun 11, 2012 10:24 |  #2

I have always found the focus of the 50mm 1.8 II eratic like you are experiencing (3 copies). I did pick up a version mk1 of the 50mm 1.8 at it is much more consistent.


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chongkiat
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Jun 11, 2012 10:34 |  #3

so , will the 50mm f1.4 solve my problem??? I got no problem on tamron 17-50mm f2.8 and canon 85mm f1.8 , the focus ring won't MOVE if i focus on the same subject , but the 50mm will focusing even focus the same subject :confused::confused:


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Virto
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Jun 11, 2012 10:51 |  #4

It's the camera picking up the differences in contrast. It's not always a sure thing, especially if you're close to the MFD of the lens. Back the tripod up another 2-3 feet and try again, and let us know what aperture you're shooting at. At 1.8, shallow dof can make it seem like a lens missed focus.

Don't forget that the focus sensor is actually bigger than the little box you see in the viewfinder. The camera will look for the most obvious difference in contrast in that area, and focus on it, and it might not be the logo you're shooting.


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chongkiat
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Jun 11, 2012 11:20 |  #5

Virto wrote in post #14562883 (external link)
It's the camera picking up the differences in contrast. It's not always a sure thing, especially if you're close to the MFD of the lens. Back the tripod up another 2-3 feet and try again, and let us know what aperture you're shooting at. At 1.8, shallow dof can make it seem like a lens missed focus.

Don't forget that the focus sensor is actually bigger than the little box you see in the viewfinder. The camera will look for the most obvious difference in contrast in that area, and focus on it, and it might not be the logo you're shooting.


The problem is it only happen on 50mm f1.8, the 85mm f1.8 and tamron 17-50mm got no this problem, i focus on the same subject it suppose no more hunting if u refocus on the same subject, but the 50mm focus ring just sill move around if u half press and re-half press


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saintz
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Jun 11, 2012 15:48 |  #6

I had stopped using the 50 1.8 because of similar focus issues. In lower light the focus is just not reliable. Sometimes it won't grab at all.

The 50 1.4 is much better. The only time I've had issues is when very close to MFD on the 50 1.4 (which is really user error).


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DC ­ Fan
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Jun 11, 2012 18:27 as a reply to  @ saintz's post |  #7

An alternative way to check the focus response of a Canon 50mm f/1.8 II lens is to use it to gather images of people. That was done in these examples.

IMAGE NOT FOUND
IMAGE IS A REDIRECT OR MISSING!
Byte size: ZERO | Content warning: NOT AN IMAGE


IMAGE NOT FOUND
IMAGE IS A REDIRECT OR MISSING!
Byte size: ZERO | Content warning: NOT AN IMAGE


IMAGE NOT FOUND
IMAGE IS A REDIRECT OR MISSING!
Byte size: ZERO | Content warning: NOT AN IMAGE


In these situations, there were no focus problems, even though the subjects were moving. Perhaps the camera handles moving subjects differently than static subjects in a single plane..



  
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chongkiat
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Jun 11, 2012 19:25 |  #8

I just feel that sometime i can focus accurately but sometime not, look like i need to stop down to at least f3.5 to get accurate sharp image =.=, really no point to keep this 50mm f1.8 if need to stop down since my tamron at 50mm f2.8 also able to give the sharpness


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kay188
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Jun 11, 2012 22:35 |  #9

Known issue about this lens since time. It's because of it's cheap built and it's AF motor. It's not as accurate as more expensive lenses.

The reason why you get sharper images having it stopped down because your DoF increases allowing focus error to hide.


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kin2son
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Jun 11, 2012 22:58 |  #10
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chongkiat wrote in post #14565300 (external link)
I just feel that sometime i can focus accurately but sometime not, look like i need to stop down to at least f3.5 to get accurate sharp image =.=, really no point to keep this 50mm f1.8 if need to stop down since my tamron at 50mm f2.8 also able to give the sharpness

you get what you pay for. What do you expect from an el cheapo $100 lens???

The 50 1.8 focus has always been slow, erratic and noisy.


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chongkiat
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Jun 12, 2012 00:30 |  #11

kin2son wrote in post #14566187 (external link)
you get what you pay for. What do you expect from an el cheapo $100 lens???

The 50 1.8 focus has always been slow, erratic and noisy.

Did i complain it to be slow and noise??? I know i get what i paid , i just wan to confirm that izit how this 50mm f1.8 work?? Mean when u focusing on the SAME Object , the focus stil will moving even at 2nd time Focus......the focus ring suppose not to rotate anymore if the object is focus


Maybe i should take some video and upload here


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kin2son
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Jun 12, 2012 01:14 |  #12
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chongkiat wrote in post #14566510 (external link)
Mean when u focusing on the SAME Object , the focus stil will moving even at 2nd time Focus......the focus ring suppose not to rotate anymore if the object is focus

I think that's normal? Because when you half press the shutter, the lens will go thru the auto focus process. Now as we all know the nifty is bad at focusing, it goes thru the AF cycle again (thus the rotation) when you half press the second time. Also because it's focusing ability is so terrible (and slow and noisy), the result will be random, sometimes it finds something to lock on, sometimes it doesn't. Despite the fact that it's on a tripod and focusing on the same thing.

The other lenses you own does the same process, the only reason you don't realize is because the AF on the other lenses are faster and quieter compared to the nifty that's all.

Hope this explains it.


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tfd888
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Jun 12, 2012 01:18 as a reply to  @ kin2son's post |  #13

Mine will do this time to time as well. Having used a couple copies of this lens, I personally think it's just how the lens is. This lens is not known for it's amazing AF capabilities :lol:


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algold
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Jun 12, 2012 01:29 |  #14

erratic, inconsistent and noisy AF were the reasons why I sold my 50/1.8 II. the IQ was pretty good when it managed to focus right.


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chongkiat
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Jun 12, 2012 02:42 |  #15

Would think to upgrade to 50mm f1.4, will the focus accurate on pair with 85mm f1.8?


Canon 60D Gripped | Canon 17-55mm f2.8 IS USM | Canon 85mm f1.8 USM | Canon 580exII
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Question about 50mm f1.8
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