Fiendish Astronaut
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This seems at first to be a similar thread to another one up here, but it isn't the same!
I bought a used 24mm 1.4f Canon lens from a shop and tested it out and it seemed fine. I bought it to take to concerts so I could use it in dark conditions and get good results. But on viewing my images it seemed that the in focus parts of my shots were a few inches in front of the points I focussed on. I found this was the case consistently in all my shots from this and in a subsequent concert.
Check out these examples. On both occassions I focussed on the subject's eyes, yet the sharpest parts of the image seem to be on the mic stand just in front.
http://bighugelabs.com/flickr/onblack.php?id=2902458877&size=large
http://bighugelabs.com/flickr/onblack.php?id=2935720790&size=large
As I said this seems to be consistent, so I don't believe it's due to the movement of the artist. Using a zoom at the same concerts I got many tack-sharp images of my subject's face.
Firstly, am I crazy? Secondly, doesn't auto focussing use th image through the glass to find the focussed part of the image so shouldn't this be impossible (lack of technical knowledge here so I may be wrong about this)? Thirdly, I've tested this at home, and the lens seems fine in my well-lit house - albeit perhaps not fiocussing to the same distance.
So yes it sounds like I'm being paranoid, but I'm getting a consistent series of images where the focussing is perfect on the mic stand but not on my subject's face! If this is a possible problem one can get with a prime lens, what is the best way of testing this?
Thanks in advance to anybody who can shed some light on this...
:x
I bought a used 24mm 1.4f Canon lens from a shop and tested it out and it seemed fine. I bought it to take to concerts so I could use it in dark conditions and get good results. But on viewing my images it seemed that the in focus parts of my shots were a few inches in front of the points I focussed on. I found this was the case consistently in all my shots from this and in a subsequent concert.
Check out these examples. On both occassions I focussed on the subject's eyes, yet the sharpest parts of the image seem to be on the mic stand just in front.
http://bighugelabs.com/flickr/onblack.php?id=2902458877&size=large
http://bighugelabs.com/flickr/onblack.php?id=2935720790&size=large
As I said this seems to be consistent, so I don't believe it's due to the movement of the artist. Using a zoom at the same concerts I got many tack-sharp images of my subject's face.
Firstly, am I crazy? Secondly, doesn't auto focussing use th image through the glass to find the focussed part of the image so shouldn't this be impossible (lack of technical knowledge here so I may be wrong about this)? Thirdly, I've tested this at home, and the lens seems fine in my well-lit house - albeit perhaps not fiocussing to the same distance.
So yes it sounds like I'm being paranoid, but I'm getting a consistent series of images where the focussing is perfect on the mic stand but not on my subject's face! If this is a possible problem one can get with a prime lens, what is the best way of testing this?
Thanks in advance to anybody who can shed some light on this...
:x
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