Canon G9 Vignetting

[Maarten_NL]

While I was browsing thru my pictures I noticed that most of the pictures show signs of vignetting. I made some test shots of a white wall and yes, very noticable vignetting, with or without flash.

First is without flash, 2nd with.

I found only on reviewsite which noticed it too on some test pictures but did not write anything about it. Does anyone else with a G9 see this vignetting?

 

[waytooslow]

was this at widest angle setting, if so it is common, even my high dollar l series glass 20-35 does it, even more when using a flash, flash fall off at corners. The inverse law of light comes into play.

 

[waynel]

Yep, he's right. angle, distance from subject, all those things. Nothing to worry about, there are some physical laws not even Canon or Nikon can change.

 

[maged_mmh]

try macro mode

 

[SFLDiver3445]

That's interesting, I was not aware of that fact.

The question is, does that vignetting affect underwater pictures adversely? I tend to think not, because even though I've only had my G9 for about four weeks now, I've taken a fair amount of pictures and I haven't noticed vignetting effects in my pictures utilizing a wide angle lense at it's widest angle setting.

Here's an example of a shot I took Saturday on a reef in Miami, utilizing my G9 in a Patima Housing with the short port at its widest setting and utilizing an Inon UWL-100 Wide Angle Conversion Lens with dual Inon Z-240 Strobes. The visibility was poor, I guestimate approximately 40 to 45 feet, but I think it still serves as an example that there appears to be no vignetting adversely affecting the bottom white sand corners of the picture.

Adrian

 

[Nemrod]

That's interesting, I was not aware of that fact.

The question is, does that vignetting affect underwater pictures adversely? I tend to think not, because even though I've only had my G9 for about four weeks now, I've taken a fair amount of pictures and I haven't noticed vignetting effects in my pictures utilizing a wide angle lense at it's widest angle setting.

Here's an example of a shot I took Saturday on a reef in Miami, utilizing my G9 in a Patima Housing with the short port at its widest setting and utilizing an Inon UWL-100 Wide Angle Conversion Lens with dual Inon Z-240 Strobes. The visibility was poor, I guestimate approximately 40 to 45 feet, but I think it still serves as an example that there appears to be no vignetting adversely affecting the bottom white sand corners of the picture.

Adrian

Your photo you posted is great, have you the dome for the UAL 100?

Sometimes wet mount lenses will vignette above water until they are in the water, imagine that. The natural magnification that ocurss with the water on the flat port (once the space bwetween lenses is flodded) acts to reduce the effective angle of view eliminating the vigneting.

N

 

[SFLDiver3445]

Your photo you posted is great, have you the dome for the UAL 100?

Sometimes wet mount lenses will vignette above water until they are in the water, imagine that. The natural magnification that ocurss with the water on the flat port (once the space bwetween lenses is flodded) acts to reduce the effective angle of view eliminating the vigneting.

N

No, I haven't purchased the dome for my lens yet, because I'm still trying to figure out whether or not I would like to use the domed lens for everything or whether I will buy another UWL-100 and apply the dome to that one, that way I can either shoot with the wide angle or the domed semi-fisheye.

 

[Maarten_NL]

was this at widest angle setting, if so it is common, even my high dollar l series glass 20-35 does it, even more when using a flash, flash fall off at corners. The inverse law of light comes into play.

yes that was at the wide setting, I'll try other settings and my external flash and see if it still shows.

That's interesting, I was not aware of that fact.

The question is, does that vignetting affect underwater pictures adversely?

I noticed it on pictures that have a light blue sky like this.

Picasa Web Albums - Maarten in 't Groen - Lesbos, Korak...

Just browsed thru my underwater pics but I could not find vignetting underwater.

So it is not really disturbing as long as you don't shoot pics of white walls..

BTW, very, very nice picture. I whish I had reefs like that near my house.

 

[SFLDiver3445]

I noticed it on pictures that have a light blue sky like this.

Picasa Web Albums - Maarten in 't Groen - Lesbos, Korak...

Just browser thru my underwater pics but I could not find vignetting underwater.

So it is not really disturbing as long as you don't shoot pics of white walls..

BTW, very, very nice picture. I whish I had reefs like that near my house.

Yes, it is visible in the corner of the light sky portion of that picture. That's goot to know. Now I'm glad I don't use my G9 for any topside picutures. Thanks for the info!

And yes, I am very fortunate to have several dive boats that will take me to some very nice ocean diving, and I only have to drive approximately 5 minutes away from my home - I love South Florida!

Adrian