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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 19 Feb 2014 (Wednesday) 00:08
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Is my sigma 17-50 giving me non level photos?

 
digitalduck
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Feb 19, 2014 00:08 |  #1

So no pics yet, will post in morning but I receive my 17-50 last week and shot a bunch of landscapes and mountain views over the weekend. Long story short is that I noticed that with almost all of the mountain/horizon photos that I took into Lightroom it seemed like I had to crop/adjust angle on all of them. Just as a test I put a level on top of my dresser and shot what I thought looked level. In post, when clicking on the angle crop adjuster, it looked like the line had a gap that narrowed as it went to the right.

Assuming it's something on my end which would be great, but can a lens be just off like that? Or is it the perspective of the Wide angle lens or at least the 17mm FL etc which is causing this?

Thanks :)




  
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CoRNDoG ­ R6
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Feb 19, 2014 00:14 |  #2

Wide angle lens will cause barrel distortion, especially around the corners. It's more noticeable the wider you go.


Robert
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1Tanker
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Feb 19, 2014 00:23 as a reply to  @ CoRNDoG R6's post |  #3

A lens can't do that. Even if you could rotate the lens in it's mount, the picture is still through a round lens, onto the sensor.

You can try using the built-in level on your 60D, on a tripod as well.

I'd have to assume that it's distortion, but still shouldn't be that bad.


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oxygen45
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Feb 19, 2014 01:28 |  #4

I use the focal points when looking through the viewfinder to get a rough level. It is good enough 95% of the time.

The distortion should not be bad enough at 17mm that it will cause the effect you are worries about.


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Sirrith
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Feb 19, 2014 06:46 |  #5

It isn't the lens. As said by a poster above, a lens projects a round image circle, it is the sensor which must be level for the image to come out level. You aren't holding the camera level.


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digitalduck
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Feb 19, 2014 08:33 |  #6

Lol nice to know it's just me, I'll make sure I'm more steady when shooting. It also was very windy and that probably didn't help :) thanks for the peace of mind!




  
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John ­ from ­ PA
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Feb 19, 2014 15:59 |  #7

I assume you are using the 60D in your profile. I don't have my 60D with me but I think it has a level in the display. Are you using that as a guide? It isn't perfect, as imrecall some numbers like +/- 4 degrees is the tolerance.




  
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gonzogolf
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Feb 19, 2014 16:02 |  #8

digitalduck wrote in post #16701186 (external link)
Lol nice to know it's just me, I'll make sure I'm more steady when shooting. It also was very windy and that probably didn't help :) thanks for the peace of mind!

You'll find that shooting in the mountains you will swear you were level until you see proof on the screen.




  
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John ­ from ­ PA
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Feb 19, 2014 19:13 |  #9

digitalduck wrote in post #16701186 (external link)
Lol nice to know it's just me, I'll make sure I'm more steady when shooting. It also was very windy and that probably didn't help :) thanks for the peace of mind!

60D definitely has a level, see pg. 127-128 in the manual.




  
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Charlie
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Feb 19, 2014 19:51 |  #10

on a side note, love the sig: "Your camera takes great photos!"

I get it all the time :)


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Is my sigma 17-50 giving me non level photos?
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