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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 11 Jun 2012 (Monday) 21:02
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My new sigma 30mm, f1.4, how do you think of this copy

 
dslr_newbie
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Jun 11, 2012 21:02 |  #1

After I got my canon 60D, I want a wide angle lens for indoor use. I wondering among Canon EF 28mm, f2.8, Canon EF 35mm, f2.0 and Sigma 30mm, f1.4 three lenses. After read different reviews, finally I bet on sigma 30mm, f1.4, wishing could get a good copy or I can calibrate it later (it has 10 years warranty in Canada)

I uploaded 2 images of f1.4 and f2.2 . From my point of view, f1.4 is soft and front focused, f2.2 is sharp, f2.5 is even sharper ( large photo please click (external link)).

the displayed photo is almost center cropped, the camera is mounted on the tripod and focused to the center of the brown color box (the exactly point is TA in the upper part of the circle), f1.4's image information is listed below

Actually I sent this lens with my camera to Sigma Canada service center in Markham (Gentec), and the technician there said both my lens and camera have no focus issue. But from some review, somebody said the center of this sigma lens is as sharp as Canon 35mm f1.4L, how do you think this copy, I expected too much?


Camera Model Canon EOS 60D
Shooting Mode Aperture-Priority AE
Tv( Shutter Speed ) 1/1600
Av( Aperture Value ) 1.4
Metering Mode Spot Metering
ISO Speed 400
Lens 30mm
Focal Length 30.0mm
Image Size 5184x3456
Image Quality RAW
FE lock OFF
AF Mode One-Shot AF
AF area select mode Manual selection
Drive Mode Single shooting
Live View Shooting OFF


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canon 60D, canon 100mm F2.8L, canon 15-85mm, canon 50mm F1.8, sigma 30mm F1.4, sigma 50mm F1.4

  
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Don ­ Madson
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Jun 11, 2012 21:30 |  #2

The second picture is sharper than the first. At 1.4mm, the DOF is quite minimal, and I think your lens is working fine.


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John ­ from ­ PA
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Jun 11, 2012 22:04 |  #3

At 18 inches, f/1.4, the DOF is 0.46 inch so I would say it is very near spot on. Keep in mind that the edges will not be in focus, since they fall outside the roughly plus/minus 1/4 inch from the focus point.




  
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kay188
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Jun 11, 2012 22:32 |  #4

Your test is weird, and your crops are off center which confuses me until I actually took the time to look at it.

You should just print this and take a photo of this outside at different angles.

You will then see if your lens focuses properly.

Even at a near parallel angle, you should see the focus area to be on the black line on the sheet, although the image may look soft, you're checking focus not sharpness.


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Tommydigi
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Jun 11, 2012 22:46 |  #5

Shoot some people or what ever your interested and see how it does. Not scientific but you will know if it's off after a few days.


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kin2son
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Jun 11, 2012 22:51 |  #6
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looks fine to me. 35L is soft wide open as well imo.

Don't pixel peep too much when shooting a fast prime wide open, it will never be as sharp as when it's stopped down.

and yes maybe you are expecting too much.


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dslr_newbie
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Jun 12, 2012 20:04 as a reply to  @ kin2son's post |  #7

thanks for your advice. my butterfly (f2.2 1/1250s) in the garden, focus on thebody (external link)


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canon 60D, canon 100mm F2.8L, canon 15-85mm, canon 50mm F1.8, sigma 30mm F1.4, sigma 50mm F1.4

  
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JNowakPhoto
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Jun 12, 2012 21:37 |  #8

Your lens looks fine.


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My new sigma 30mm, f1.4, how do you think of this copy
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