Vignetting, how to get rid of??

[LeicaFoReVer]

What are the techniques to have less vignetting with wide angle lenses and film leica Ms?

I have 15mm and had some shots with vignetting recently. I dont remember what aperture I used but the environment was white salt and open sky. Does that affect the degree of vignetting?

I saw some filters being used with 15mm with center darkened. Can that be mounted on old screw mount 15mm?

 

[LeicaFoReVer]

Simple - during DNG import, adjust the vignetting slider to brighter, rather than darker. Or in Photoshop under "Filters | Lens correction..." the same way, just to name a few options.

Nooo I said on film cameras, no digital processing, I want to know photography techniques..

 

[jsrockit]

Dodging? (or just let it vignette!)

 

[LeicaFoReVer]

When does a lens vignette when does not?
Does stepping down always work?

 

[mfogiel]

First, if you like to avoid vignetting, shoot Tri X rather than Velvia.... this makes a lot of difference. Second, the center filters eliminate the problem, BUT at the expense of lens speed - it is not unusual to lose 2-3 stops in the process. Third, try to stop your lens down to f8.0, this will help as well.

 

[LeicaFoReVer]

First, if you like to avoid vignetting, shoot Tri X rather than Velvia.... this makes a lot of difference. Second, the center filters eliminate the problem, BUT at the expense of lens speed - it is not unusual to lose 2-3 stops in the process. Third, try to stop your lens down to f8.0, this will help as well.

What can be the reason for vignetting in this shot? i dont remember the aperture I used. Does a highly reflective white subject exaggerates the vignetting?

 

[alaric]

I agree with the above comments, stop down the lens. In my experience, I get vignetting when I'm using the largest aperture.

 

[rxmd]

What can be the reason for vignetting in this shot? i dont remember the aperture I used. Does a highly reflective white subject exaggerates the vignetting?

There are different reasons for vignetting. Some are due to an optical law called the cos^4 law, that states that vignetting is directly proportional to the angle of incidence at which a light ray strikes the film plane - the prime reason why vignetting is common with "classic" wide angles of a highly symmetrical construction. Others are due to the way the lens is built, the shape of the hood, or other factors. In general, stopping down does not get rid of cos^4 vignetting (because the angles stay the same), but it may get rid of lens- or hood-specific vignetting.

Obviously vignetting is more visible on bright backgrounds than on dark ones, so your picture with a sky and a salt lake in it is a prime candidate to show it in its most pronounced form.

Lastly, vignetting may be more pronounced by the contrast setting in postprocessing. For example, in your picture, if one wanted to emphasize the structures on the ground which are very bright, one would choose a contrast curve with a high degree of differentiation in the highlights, so that the darker areas would have a tendency to go black. This would then emphasize vignetting as well. Looking at your shot it looks like this is what happened. (Incidentally, this is also the reason why it is more pronounced on slide film than on B/W or colour negative film, because slide film has less exposure latitude and tends to show exposure differences more prominently.)

 

[Pablito]

Per post #5, dodging in the darkroom.
Center filters, also make sure you have the proper hood or use no hood or filters.
Thazzzzabout it.
Ironically, I find myself adding vignetting more often than taking it away. It's very much de-rigeur in "the new photojournalism."