polarcow
Member
I recently tried out some kodak e100g with my ZI. I got the slides back and was surprised to see what appears to be severe light fall-off at the edges of one of the pictures with the 25mm zm seen here:
http://www.flickr.com/photos/34099144@N00/
There is another pic with the 25 that does not appear to show this effect (the wall pic was taken at an angle so the right edge is a little fuzzy). Is the effect of the blue sky darkening at the corners a problem with the lens or is it the response of the film? The five shots were taken on the same roll. Thanks for the replies.
-polarcow
http://www.flickr.com/photos/34099144@N00/
There is another pic with the 25 that does not appear to show this effect (the wall pic was taken at an angle so the right edge is a little fuzzy). Is the effect of the blue sky darkening at the corners a problem with the lens or is it the response of the film? The five shots were taken on the same roll. Thanks for the replies.
-polarcow
Trius
Waiting on Maitani
The falloff in the sky pics doesn't look normal. I don't have a ZI 25, but I haven't seen that on any pics posted here and made with the 25. Were you using any filters? A 3rd party hood?
Ronald M
Veteran
The flag section is in shadow. The dark patch is normal therefore. Notice it does not extent into the blue.
No ZM 25 pics were ever shown that vignetted that much. Something is wrong.
PtLens program will fix the vignetting . $15 best deal in the world.
No ZM 25 pics were ever shown that vignetted that much. Something is wrong.
PtLens program will fix the vignetting . $15 best deal in the world.
polarcow
Member
I was using a b + w haze filter but no hood. I was confused because it did not show up in the pic of the brick wall but I will go out sunday and try different aperature settings of the same scene with the 25 and see what happens.
-polarcow
-polarcow
x-ray
Veteran
I have the 25 and have never seen this. To me it looks like you shot at 2.8 and under exposed the film and then tried to pull the exposure up in the scan. There's always more illumination fall off at the corners of a super wide but at max aoerture it will be at the max fall off. Couple this with some under exposure and you're into an area of density that is quite dark at the corners. This looks like my old 21mm super angulon wide open.
Trius
Waiting on Maitani
The wall photo was taken at a closer focus distance, maybe that is a factor. Do another sky shot without the filter. B+W filters generally are thin enough to not cause a problem, but it's worth investigating.
Athena
Well-known
The vignetting on the top of image 225 is not symettrical. Looks like maybe your hand "cupped" the lens?
polarcow
Member
Well I just had a roll of fuji provia developed where I tried the 25mm at various apertures. The slides were all mixed up so I'm not sure what aperture they were shot at anymore but there were only two slides that showed noticeable light fall-off (neither was as bad as in the picture in the link). One of them I am certain was due to the upper edges being underexposed compared to the subject of interest in the middle. The other I presume was due to the wide-open aperture. This leads me to think that the severe light fall-off of the picture in the link in my first post is probably a combination of aperture and underexposure via metering off of the buildings not the sky. Thanks for all the replies.
-polarcow
-polarcow