Why do I... Using a Wide Angle Lens

[chouglez]

Why do the piccies look slanted when I click them with a wide angle such as a Sigma 10-20mm as the one shown above.............

 

[R8JimBob88]

Its just lens distortion. Can be quite creative at times, other times it can be just anoying. The wider the lens, the more distortion

 

[EdinburghGary]

Distortion, I think you can correct it but I haven't a clue how.

 

[chouglez]

So it seems normal. I thought there was something wrong with my lens.......

Any more suggestions................

 

[mattyh]

You know thats the leaning tower right? It's supposed to be like that

alternatively... have a look here: http://www.crhfoto.co.uk/crh/convergingverticals.htm

 

[chouglez]

You know thats the leaning tower right? It's supposed to be like that

alternatively... have a look here: http://www.crhfoto.co.uk/crh/convergingverticals.htm

Ah! I see, that's the leaning tower of Pisa and hence it's leaning Duh!

 

[Joshuashaw]

There is a small article in this month's Digital Camera (september) on this kind of problem reffered to as Barrel Distortion, the help mentioned is very basic like use PS' lens correcting tool, surely if you google Barrel Distortion you'll get some tutorials how to correct.

 

[DiddyDave]

Here's a quick muck about for you

DD

 

[DiddyDave]

surely if you google Barrel Distortion you'll get some tutorials how to correct.

I'm sure you would - but this isn't Barrel distortion, so I'm not sure that'd be much help



DD

 

[dinorock]

I'm sure you would - but this isn't Barrel distortion, so I'm not sure that'd be much help



DD

wow well done dd you managed to straighten the leaning tower the,ve been trying for years maybe they should have just called you he he

 

[DiddyDave]

wow well done dd you managed to straighten the leaning tower the,ve been trying for years maybe they should have just called you he he

One of Photoshop's transform tools is called...

"Injecting tonnes of concrete under a falling building to a) stop it falling further, or b) straighten it back up"

- so I just used that to effectively pump about 90 tonnes of the hard stuff under the left hand side and Hey Presto



DD

 

[Yv]

Basically you have to think about the lens and what its doing... its pulling into shot a far wider angle than its front element/lens length should really allow for, down a circular tube and onto a square sensor. Add into that that you are stood at the foot of the building [LToP aside] and will naturally get converging parallels and lean in your own view, never mind a lens thats having to distort that to fit it all in.


Alternatively, you can use photoshop to add 20 tonnes of cement underneath


heres a quick & dirty edit done with PT lens - a tip, always try and get that bit further away so you have room to correct any distortion without actually loosing part of the building you were trying to photograph

 

[dinorock]

Why do the piccies look slanted when I click them with a wide angle such as a Sigma 10-20mm as the one shown above.............

check this out its what happens when you use an even wider 8mm lens its not an error its what the lens sees

http://www.muellerworld.com/peleng/

 

[Raymond Lin]

Or get yourself a t/s lens

 

[jgredline]

I have the same Sigma lens. What I have found is that from 12-20 it behaves very normally, so most of the time when I shoot landscape style, I shoot between there...However, when shooting portrait style, I love the 10-11 mm range..Just awesome...

 

[jerry12953]

Get further away, and/or climb UP something. Find a first floor window, or a car roof (not yours), or that ladder you strap to your backpack. But with extreme wide-angles it would be difficult.

PTLens is a little piece of software that can sort this sort of thing, as mentioned above...