View Full Version : depth of field issues
16th of February 2009 (Mon), 14:57
I take a lot of landscape photography. Recently, I noticed that the lower right hand corner of many of my images (no matter what the aperature) are blurry. I have tried focusing on something closer and recomposing the image and the blur is still there....?? I am an amateur and know the basics of photography but can't figure out what I'm doing wrong. Does anyone have any thoughts on this issue? I will try and post some of my photographs soon. thx
16th of February 2009 (Mon), 15:25
It's subtle, but there lower right hand corner is blurry. Could it be dust or debris on the mirror that is causing my camera to focus on the left side of the image?
16th of February 2009 (Mon), 15:40
Have you tried to manually focus so that area is in focus, just to check and see if it's able to hold focus there?
I'm thinking maybe a soft spot in the lens????
16th of February 2009 (Mon), 18:21
Has it always done this? It's very distinct... new lens, new..something? I'd say something is out of kilter somewhere.
16th of February 2009 (Mon), 19:12
What lens? What camera body? Can you post a larger pic and a 100% crop of the area?
16th of February 2009 (Mon), 19:34
It's subtle, but there lower right hand corner is blurry
It's not subtle, I can see it in these tiny web images. Does this only appear with one lens? My highest suspicion is that your lens has a decentered element or other such defect.
This is not a depth of field issue. In the second image the foreground - center trees are sharper than the ones on the right and they are closer too. Clearly not DOF related.
16th of February 2009 (Mon), 20:13
Here is another. My camera body is a Canon 400d rebel xti. The lens I usally use is my canon ef 28-135mm IS. I also use a wide angle lens 10-22mm which I haven't noticed this problem w/any of the photos yet. I almost never use my kit lens and my other lens is a nifty fifty -canon 50mm 1.8 which I just got and haven't noticed any problems with it either. I do have some photos that are in focus in the lower right corner but the majority aren't...
thanks for all of your responses. I agree that something is out of wack-probably w/my 28-135mm lens...
16th of February 2009 (Mon), 20:20
Here is a crop of the blurry area. Is this what you wanted?
16th of February 2009 (Mon), 20:37
yeah, I'd guess something off in the lens. You have blurriness in the middle ground with more sharpness in the foreground albeit it more left in the image.... it even looks like there is a difference in the same tree.. bottom more blurry than the top.
17th of February 2009 (Tue), 00:31
What do you recommend? Should I take it to a shop? Give er a tune up? Maybe I need a professional to look at the camera body and lens? I do have photos that are in focus in that region which makes me wonder...? Any suggestions appreciated. thx
17th of February 2009 (Tue), 00:33
Nothing to add really except I wanted to compliment your first image.
That's a helluva Lenticular Cloud!!
19th of February 2009 (Thu), 20:05
bump for suggestions.
I might be experiencing a milder version of the same effect...with a canon 28-135 IS. (kit lens with the 50D)
24th of February 2009 (Tue), 14:46
It looks to me like coma that could be caused by an uncentered element in the lens. It could also be cause by a field curvature, but then I would expect it only at wide apertures and in all corners. Given that it happens only with one lens, I would discount a camera problem (though I can't think of what that problem would be). Is it affected by the zoom setting on that 28-135?
Rick "thinking a general lens service might be in your future" Denney
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