Where are you focusing with your AF point?
like in the foreground, middle or background?
The in focus parts looks really good and sharp.
Not really sure where i should be focusing with this lens to be honest. In most instances i just focus right down the center of the image. I have had more practice with my other lenses and i can focus on specific objects and ignore the rest but with this UWA lens i am not really sure where my focus points should be. In most instances it's the background. Also, i am struggling to understand what it means to focus at infinity for these shots. Is it the same as focusing at the farthest object you see?
Wide open, it's not going to be as sharp as when stopped down. Focus to infinity. I'm not sure how you achieved focus, but overall, it looks fine to me, but looks a touch soft around the edges (normal) with distortion, and the center areas look the sharpest. If you did not, I would recommend you focus to infinity manually. Do not use autofocus unless you're trying to focus on something in the foreground specifically. For landscape, big scenes, etc, you want to stop down to F8 or F11, manually focus to infinity, and you're good to go.
Looking at all your images, the beach ones, the trees are soft. But other things are sharp. This tells me it's not the lens, but rather, your focusing and the fact that it's wide open aperture, not stopped down.
Looking at the stadium, the center stuff is sharp (antennae, edges of building, etc), but the peripheral stuff is softer. That's probably the lens a bit and that's due to distortion and all, maybe. I'm not positive on this one.
Did you use autofocus, or did you manually focus to infinity? I would suggest you use LiveView, magnification 10x, and manually focus on something distant (tree line, building edge) for sharpness. Call that infinity for your shots. And leave it set to manual so autofocus doesn't change it. If it's still soft, pitch the lens, get something sharper (10-22mm Canon, 14mm Rokinon/Samyang, 11-16mm Tokina, etc).
Good advice. Yes, i did make a few mistakes early on e.g. using the lens at the widest aperture just because i could. I did not have a concept of a "sweet spot" then. As i mentioned above, focus with this lens has been a bit tricky for me as i am never sure what to focus on I use autofocus primarily because i don't trust my eyes as much (helps to magnify though). I might need new spectacles.
Looks normal. The 10-20 lens is good, but c'mon, there is a reason it is what it is.
I struggled with mine at first, really, you want to shoot f8-12 if you can and either focus on subject, or hyper focal or focus first 3rd or whatever. Once you get used to it, it is a good lens.
Thanks. Reassures me that i still might get to utilize this lens to it's fullest potential. By focusing at first 3rd do you mean focus at the near spectators in those cricket pictures?
it looks a littlesoft to me...but i do wonder if you have a filter on it as well...especially with the double flare in the first cricket shots...also stopping it down to about f8 should be the sweet spot
you do want to make sure you know where you are focusing, i typically focus about 4 feet in front of me, and with the large DOF everything else is in focus as well...if you point it to the other side of the stadium you're not going to get the best shot sometimes, or if you are shooting at f4, and aim too close you won't have the DOF extend all the way to infinity
i do agree with others that you don't want to over-analyze at 100%
UV Filter for Cricket but not for the others.I did focus on the other side of the ground as well. How do you focus 4 feet in front of you? On a specific subject 4 feet away?
It does take some practice to get used to the UWA, as with any lens. Out of my lenses, I think I've printed more photos and dramatic scenes from my 10-20mm than any other of my lenses; its a great lens.
I noticed on a few of your shots you were shooting wide open, but also at like 1/4000s shutter and iso1600. You could probably stop it down some and drop your iso, while keep plenty decent shutter speeds. The nice thing about an UWA is that you dont need a very high shutter to keep things sharp. You were missing exif info on flickr for quite a few, but I'd recommend stopping down, dropping the iso and not using such a fast shutter.
Yes, sorry about the missing EXIF info. I took those beach shots the day after i got the lens so i made quite a few noob mistakes. The cricket shots were taken yesterday so i was more on the money with the shutter and ISO. Messed up the Aperture for a few of those shots though by not paying enough attention.
I think i might have a focusing problem. I just don't know where to focus in UWA