Photography Thailand Forum

[bjorn slis]

Has anybody ever experienced this ? (corners) 
Is this the result of the lens not being on the body properly ?
Have a whole card full of them but can't seem to replicate the problem.

thanks

bjorn

[Gregg Spradling]

Were you using a lens hood at the time? If so, was it in the right position?

How about a filter? Sometimes you get vignetting with certain filters when shooting at the wide end.

[bjorn slis]

might be the case, was shooting most of it at 12 mm, lens hood on
will try to see if I can replicate that

thanks

[bjorn slis]

damn, i feel stupid ! should have thought of that myself
you were right, there are a couple at 15 mm or more that didn't have it

thanks you very many

[Marc Schultz]

Good call Gregg. Yes, both a lens hood, and a lens filter frame can cause vignetting like this on wide angle lenses from the wide angle of view. If you shot in RAW though, there is a function in Camera Raw in Photoshop (and probably Lightroom as well) to fix this issue. So you may be able to correct the darkness at the edges in some of your pictures. I don't know what F-Stop you were shooting at, but at F/11 there would also be less vignetting in general than say at F/5.6. I hope this helps.

[bjorn slis]

Thanks Mark, usually shoot between f9 and f13 somewhere, but I also try to shoot a bit wider than needed so I have some possibilities to crop and do some lens corrections without losing important details, so that helped me in this case.

[Marc Schultz]

That makes sense. I would avoid stopping down more than F/11 though in general. Those wide angle lenses usually degrade on picture quality at F-Stops higher than F/11. Also, with wide angles in general, not much additional detail is gained from a narrower F-Stop. Visibly you probably wouldn't see much difference in detail between F/8 and F/13 on a super wide angle lens like what you are shooting with. The edges wont be so sharp no matter what after a certain point anyway. I was only suggesting a narrower aperture like F/11 to help deal with possible vignetting problems.

[bjorn slis]

agreed Mark, full frame and 14 mm 2.8 are on the wishlist,
but for the money the 12-24 f4 is not a bad lens and since it's all for interweb use anyway I have spent some money on a couple of other primes and a 80-200 f2.8 first