Our focuses, on the next rebel up, the T1i. It's hard to tell at f/1.8 because of potential camera and subject movement, and softness wide open, but at f/2.2-f/2.5 or so, it's great. Are you choosing an appropriate focus point, or attempting to focus and recompose? Recomposing doesn't work well with a thin DOF.
On Flickr - Namethatnobodyelsetook on Flickr
Canon: R8 | R7 | 7DII | 10-18mm STM | 28-70mm f/2.8 | 50mm f/1.8 | 85mm f/1.8 | 70-300mm f/4-5.6L | RF 100-500mm f/4.5-7.1L
Sigma: 18-35mm f/1.8 Art | 35mm f/1.4 Art | 50-100mm f/1.8 Art Laowa: 100mm 2X Macro
I don't recompose, I just stay in one place and try to get the same picture but focused differently until it's sharp (at the eyes).
This is a crop from the first 50mm shot I found while digging around. It's a 100% crop taken at f/3.2.
I'm having a hard time finding a shot wider than 3.2 that isn't hampered by the fact that it was really dark and we used ISO-3200 as well...
On Flickr - Namethatnobodyelsetook on Flickr
Canon: R8 | R7 | 7DII | 10-18mm STM | 28-70mm f/2.8 | 50mm f/1.8 | 85mm f/1.8 | 70-300mm f/4-5.6L | RF 100-500mm f/4.5-7.1L
Sigma: 18-35mm f/1.8 Art | 35mm f/1.4 Art | 50-100mm f/1.8 Art Laowa: 100mm 2X Macro
Wao, Its damn closeup with sharp quality.
The 50 1.8 is probably the cheapest lens you can buy these days. Are these fairly new purchases or are they a few years old. I wonder if the focusing machanisms are just worn and are no longer in sync? The review of the lens on this site was not to favourable but it does state:
The Canon EF 50mm f/1.8 II Lens' strongest quality is its sharpness. Sharpness performance wide open (f/1.8) is decent, but the Canon 50 f/1.8 is very sharp at f/2.8 and beyond. It is slightly sharper than even then Canon EF 24-70mm f/2.8 L USM Lens.
You would think you should be getting decent shots. Just not sure why you would use a lens of that quality on a 7D or 5D [:P]
MattG
My 50 f/1.8was an impulse buy about 2 weeks ago, so very new. I am still glad I bought this lens as it has allowed me to play with a prime and lower apertures, but the conclusion I've come to is that it is sharp, but does seem to have a focusing problem. I spent ~200 pictures playing with the focus and trying to use the micro-adjustment feature to correct it. Obviously, I am still learning and this was the first lens I've tried to microadjust, but I would found I could dial it in at one distance, but then I would set up on another distance and it was again have slight focusing issues. I also noticed that focus was much sharper using a single point rather than multiple points (probably to be expected, but there seemed to be a significant difference). Finally I was doing a test looking at a printed page at ~20 degree angle from ~2 ft away. The lens could focus in front of my target or behind my target, but never on my target. I am currently thinking that the gears that drive the autofocus are so course/large that they are cause autofocus issues. This problem is somewhat random when using a single point focus (depends upon where you are in relation to the gears), but comes more into play when the camera tries to bring multiple points to within focus as you end up with a general "softness."
Does this sound plausible?
Originally Posted by Kayaker72
I sold my 50mm f/1.8 before I got a body with AF microadjust, so I don't know if I would have had the same experience as you or not. However, one thing I would mention is this: only the center point autofocus has the f/2.8 accuracy, and even then it's only rated to 1/3 DOF. So if you haven't already, try seeing if it's consistant at f/3.5 or so (let autofocus run wide open at f/1.8). If it works that way, then you're probably getting normal results (the limitation of the autofocus system). If it's still inconsistent, then the problem is elsewhere.
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