Back Focussing 50mm 1.8?

[Guitarman0]

I received my canon 50mm f1.8 in the post today and have got a bad feeling it is back focussing

Here are some sample shots I took with the number 11 set right inside the center focus point. RMA time?

f1.8

100% crop

f2.8

100% crop

 

[Guitarman0]

It's front focusing slightly, but it doesn't actually look that bad to me although it's hard to tell without using the lens. What made you think there was a problem? Were you getting soft shots or did you test it out of the box? Another thing I found with my 50 1.4 that front focused (by 4-5cm) was that it did miles better outside. In my experience indoor lights, especially fluorescent, can be really iffy.

I took a few photos of my mum and although I thought I had focus bang on her eyes it came out with focus more on her forehead however she was a moving subject and I have never used a lens above aperture 3.5 so it may have been my fault. Just finishing off photos of that chart and will post here when done. Thanks for the help so far.

 

[Guitarman0]

Well here are the pictures from the chart and I am starting to wonder if there is a problem after all. Looking at the shot at 1.8 I still think it is fron focussed slightly but is this worth RMAing for? Or is the lens just fine?

1.8

100%

2.8

100%

4

100%

5.6

100%

 

[Guitarman0]

After doing some more playing around I have tried autofocussing on a point and trying to correct it with manual zoomed in 10x in live view and I can't seem to get it any sharper. I think my problem is I was expecting it to be sharper at f1.8 than it is. Will test it more tomorrow.

 

[Guitarman0]

O.k. thanks guys. I guess it was just that initial worry that something might be wrong (I have had more than my fair share of faulty goods bought from online!).

Cheers