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I may have gotten a bad Canon lens. Thoughts? EF-S 15-85 - Page 2

post #11 of 53
A lot of lenses are like this.

At first the pictures look great, but once you zoom in at 100% it's soft. Of course some lenses vary a bit, and yours may be a bit softer.

It's normal. There is a term we use: "pixel peeping". They say most people are happy with their lenses as long as they don't pixel peep- that is, zoom in all the way.

Of course, you get what you pay for. Those $1000+ prime lenses (e.g. 100L, 35L, 85L, etc.) will look considerbly better when you zoom in at 100%.
Edited by Winwin - 11/3/11 at 3:39pm
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post #12 of 53
All this is good advice. If your lens really is soft then it is due to a front or back-focus problem. You can check for this by using live view to take the shot as suggested above. Live view uses a contrast auto focus mechanism directly through the lens and does not suffer from front or back focus issues. Viewfinder autofocus is a phase detection autofocus mechanism that bounces the light off the mirror and any misalignment leads to front or back focus.

Using viewfinder autofocus, put the camera on a tripod. Set it to the widest aperture. Focus in single point mode on a coke can or something similar. Put some objects both in front and behind the coke can. Take the shot, preferably with a remote release. Check the image. See if the writing on the coke can is in focus, or if it is out of focus, check to see if the objects in front or behind are in focus. If the coke can is out of focus and the objects in front or behind are in focus, then you have a front or back focus problem and you should send the lens back for adjustment.

A final word: if you pixel peep then any image will probably look bad.
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post #13 of 53
good focus

it's not bad from what i've seen from the 15-85. no lens is perfect at 100% (well, maybe Leica ones). the focus is pretty spot on (for f/8 anyway) the text on the danger sign is nice, sharp and readable and it even resolves the brush strokes on the paint. the other two has pretty bad lighting and will exaggerate a wide-range zoom's worst quality - chromatic abberation.

besides operating an SLR properly, you should also look into improving your post-process techniques. i'm pretty bored so for fun i ran it though photoshop quickly.

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post #14 of 53
Quote:
Originally Posted by Dream Killer View Post
besides operating an SLR properly, you should also look into improving your post-process techniques. i'm pretty bored so for fun i ran it though photoshop quickly.
Slow day in the ER?
post #15 of 53
It's a $150 lens... if you want quality, you're going to have to spend 500+
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post #16 of 53
Quote:
Originally Posted by critical46 View Post
It's a $150 lens... if you want quality, you're going to have to spend 500+
15-85, not 18-55.
post #17 of 53
Quote:
Originally Posted by critical46 View Post
It's a $150 lens... if you want quality, you're going to have to spend 500+
As sub said, 15-85mm, not 18-55mm.

Even then, the 18-55mm IS is a nice, sharp lens, esp for the money.
post #18 of 53
Didn't think to open it up in DPP - but that shows it was on auto focus point selection. I don't trust auto point selection pretty much ever.
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post #19 of 53
Thread Starter 
Well I sent the lens in to Canon today to see if they can see anything wrong with it for peace of mind.

All the photos are completely unprocessed.
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post #20 of 53
Thread Starter 
Quote:
Originally Posted by critical46 View Post
It's a $150 lens... if you want quality, you're going to have to spend 500+
Um no... It was $735 it's a 15-85

http://shop.usa.canon.com/webapp/wcs...0051_228451_-1
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