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I may have gotten a bad Canon lens. Thoughts? EF-S 15-85 - Page 4

post #31 of 53
Thread Starter 
Quote:
Originally Posted by sub50hz View Post
1. Did you downsize the images from your T1i to the same pixel dimensions as the PowerShot's output?

2. Did you test sharpness by mounting the camera on a tripod, using live view + 10x magnification to obtain precise focus?

3. Have you looked at other sample shots using your camera/lens combo?

4. Why does it matter what it looks like at 100%? Do you have any idea what size the print would have to be, and how close you would have to stand to it for a 100% on-screen view to be representative?

Your methodology is flawed if you haven't done these things, and your lens' return trip to Canon will end up with a speedy "No Fix Required" turnaround.

http://www.the-digital-picture.com/R...ns-Review.aspx
I have not done this specifically but the lens is obviously less sharp than my other lenses. I have taken plenty of shots with it and compared. I set this lens up on a tripod and compared it to my cheapy 50MM fixed lens auto focusing to the center AF point on the same object at the same aperture and iso settings. At 100% crop this lens is not clear, and the other one is.


I have extensively looked through 100+ pages of shots from this lens on the Canon photo forums and they are all much sharper than mine.

I don't even need the photos to even be blown up to recognize that they are not sharp. Just looking at the photos on the computer I can tell that they are less sharp than my other shots from other lenses. Are you saying I should just settle with this?

I am not happy with the quality of this one so I sent it back to the retailer for a replacement. There are also others online who have gotten bad ones as well. Saying that it doesn't mater how good the lens is when the pictures are blown up is like saying that I should be okay with getting a brand new car rated at 35 mpg but when I drive it I only get 20. There is something wrong with that logic.
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post #32 of 53
Only read the first page and your last post but. Assuming you get one with nothing wrong with it you might still end up with a front or back focusing setup. The upper end bodies allow for adjustment if you have a test rig its not so bad. But otherwise most people sent the body and lens to canon to be calibrated.
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post #33 of 53
You know you just compared a consumer zoom to a prime lens, right? Unless it's an L lens or the 17-55mm, the prime is going to be sharper, even something as cheap as the Nifty (which optically is the same as the 50mm f/1.4).
post #34 of 53
Just send it back. I would do it if I had any concerns.
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post #35 of 53
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Quote:
Originally Posted by r31ncarnat3d View Post
You know you just compared a consumer zoom to a prime lens, right? Unless it's an L lens or the 17-55mm, the prime is going to be sharper, even something as cheap as the Nifty (which optically is the same as the 50mm f/1.4).
Going through the thread on the canon photo forums the general consensus is that this lens is as sharp or sharper than most of their L zoom lenses. There were also specifically posts of people saying that this lens is sharper than the 50MM 1.8 which is what I compared it to.
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post #36 of 53
Thread Starter 
Here is the comparison photo

f8 iso400 and 1/30 sec both lenses at 50mm and auto focusing to the center af point on the label. On tripod


Edited by killeraxemannic - 11/7/11 at 7:15am
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post #37 of 53
The 50 is as would be expected sharper to me. Even on my non editing monitor.
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post #38 of 53
is that wide open?
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post #39 of 53
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Quote:
Originally Posted by MistaBernie View Post
is that wide open?
Both are at f8 1/30sec on a tripod
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post #40 of 53
Lol, there are very few lenses that are sharper than the "cheapo" 50 at f/8. If you think the 15-85 is sharper than "most of the L zooms", you're delusional.
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