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Canon G5 purple fringing tests......

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Fin Phan

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Today, I took several samples with tin foil sheet with various settings on my G5. The below are set at: zoom 16x, compensation at 0.0, aperture mode, no-flash, custom white balance, and remote control on tripod with different ISO and aperture settings.

Here are the results set at ISO 50 with different apertures:









Here are the results set at ISO 200 with different apertures:









Here are the results set at ISO 400 with different apertures:









my point: The higher the ISO, the more purple fringing. The higher the aperture, the less purple fringing. Note that higher ISO gives you more noise. Fore example, ISO 400 with f/8.0, purple fringing is the least, but there are lots of noise. Therefore, I think the best setting is ISO 50 with apertures between f/4.0 and f/5.0. Please examine carefully.

Hope this helps some people get an idea to avoid purple fringing.
 
Cuong Phan said:
Today, I took several samples with tin foil sheet with various
settings on my G5. The below are set at: zoom 16x, compensation
at 0.0, aperture mode, no-flash, custom white balance, and remote
control on tripod with different ISO and aperture settings.

Here are the results set at ISO 50 with different apertures:









Here are the results set at ISO 200 with different apertures:









Here are the results set at ISO 400 with different apertures:









my point: The higher the ISO, the more purple fringing. The
higher the aperture, the less purple fringing. Note that higher
ISO gives you more noise. Fore example, ISO 400 with f/8.0, purple
fringing is the least, but there are lots of noise. Therefore, I
think the best setting is ISO 50 with apertures between f/4.0 and
f/5.0. Please examine carefully.

Hope this helps some people get an idea to avoid purple fringing.
Click to expand...
Thank's for taking the time to preform this test on your G5 and post the results.
 
Thanks everyone for your comments. I hoped I had clarify some questions that some might have.
 
Cuong Phan said:
Today, I took several samples with tin foil sheet with various
settings on my G5. The below are set at: zoom 16x, compensation
at 0.0, aperture mode, no-flash, custom white balance, and remote
control on tripod with different ISO and aperture settings.

Here are the results set at ISO 50 with different apertures:









Here are the results set at ISO 200 with different apertures:









Here are the results set at ISO 400 with different apertures:









my point: The higher the ISO, the more purple fringing. The
higher the aperture, the less purple fringing. Note that higher
ISO gives you more noise. Fore example, ISO 400 with f/8.0, purple
fringing is the least, but there are lots of noise. Therefore, I
think the best setting is ISO 50 with apertures between f/4.0 and
f/5.0. Please examine carefully.

Hope this helps some people get an idea to avoid purple fringing.
Click to expand...
That's a interesting test, thanks, but it might give some people the wrong idea about the G5, in real world shooting I have only had the purple fringing show up on bright indoor lights like in this shot I took this weekend, look at the ceiling lights and you will see what I'm talking about.
http://www.pbase.com/image/23561099/original
--
http://www.pbase.com/davedent
 
... and framed it well. Now you possess the definitive knowledge about shooting the aluminium foil. Congratulations.

alexeig
 
Thanks - great samples - now if some kind soul could do the same thing with a G3 we'd have a great little experiment on our hands.

Thanks Again!

Phil
 
He's just trying to help out since there's been so much confusion around here. Would be good to use real world examples instead, but at least his intentions were good.

Anyway, Dave D has the right idea for this, and really, the purple fringing is nothing new to digicams. It's just that some digicams seem to have more of it than others. Basically, the purple fringing will most likely occur around the edges of very bright, essentially blownout objects or sections of your photo. It will happen w/ just about any digicam. Happens on my G3 too, but it's just worse on the G5 than some others. And looking at Dave's photo, it does clearly look noticeably worse than the G3 from my experience.

However, in general, you can probably work around the issue by taking better care of how you expose your highlight areas. My guess is if you never let your highlights, ie. bright areas, blow out in your choice of exposure, then you shouldn't have a real problem w/ the purple fringing. Of course, it'll take some practice to do and also does limit your options a bit, so for some, this may not be acceptable.

Man
alexeig said:
... and framed it well. Now you possess the definitive knowledge
about shooting the aluminium foil. Congratulations.

alexeig
Click to expand...
--
Baseball as a metaphor for life?
Well, 'luck is a residue of design.' --Bill Dickey--
email: [email protected]
gallery: http://www.pbase.com/mandnwong
 
Hi, and thanks. That's a great picture you have there. Yes, I've noticed that it is difficult to avoid PF (purple fringing) because I had this problem when taking night shots of downtown buildings a week ago. I just want to point out that, to me, ISO 50 and f/4.0-f/5.0 tend to take the best pics with the least PF. The G5 is a great camera and has performed well.

--Cuong
 
Thanks Man-Fai Wong.

When choosing a subject, I thought the foil would be the most useful because many people would like to see how the camera performs with many hot spots as shown. I would have chosen a different subject like outside objects if the weather here wasn't so cold and gloomy. Maybe I should not post anthing anymore and let things be at rest.

--Cuong
 
Cuong Phan said:
Thanks Man-Fai Wong.

When choosing a subject, I thought the foil would be the most
useful because many people would like to see how the camera
performs with many hot spots as shown. I would have chosen a
different subject like outside objects if the weather here wasn't
so cold and gloomy. Maybe I should not post anthing anymore and
let things be at rest.

--Cuong
Click to expand...
dont let one person affect your thoughtfullness !!!!!!!!!!!!!!!!
 
alexeig said:
... and framed it well. Now you possess the definitive knowledge
about shooting the aluminium foil. Congratulations.

alexeig
Click to expand...
Wow! I'm stunned that you would post something like that, Alexeig. Was that supposed to be funny? Or were you just trying to ruin someone's day?

I thought the examples and information were very helpful, and I appreciate someone taking the time to post their findings and share them with us.
 
Dave191211 said:
That's a interesting test, thanks, but it might give some people
the wrong idea about the G5, in real world shooting I have only had
the purple fringing show up on bright indoor lights like in this
shot I took this weekend, look at the ceiling lights and you will
see what I'm talking about.
http://www.pbase.com/image/23561099/original
--
http://www.pbase.com/davedent
Click to expand...
Dave,

I just posted a message asking for help concerning what looks like to me the same phenomenon as you have with the ceiling lights, and I was told this was not CA but color cast. What do you think?

http://forums.dpreview.com/forums/read.asp?forum=1010&message=6740293
 
Took a quick look at your 1MB file, and it looks like it's probably CA -- well, what's usually considered CA anyway.

Man
Robin P said:
Robin P said:
That's a interesting test, thanks, but it might give some people
the wrong idea about the G5, in real world shooting I have only had
the purple fringing show up on bright indoor lights like in this
shot I took this weekend, look at the ceiling lights and you will
see what I'm talking about.
http://www.pbase.com/image/23561099/original
--
http://www.pbase.com/davedent
Click to expand...
Dave,

I just posted a message asking for help concerning what looks like
to me the same phenomenon as you have with the ceiling lights, and
I was told this was not CA but color cast. What do you think?

http://forums.dpreview.com/forums/read.asp?forum=1010&message=6740293
Click to expand...
--
Baseball as a metaphor for life?
Well, 'luck is a residue of design.' --Bill Dickey--
email: [email protected]
gallery: http://www.pbase.com/mandnwong
 
Yes ,the lights have some problems,as many DC do.But look at the left back wheel.Zoom in,and you will see a lot of bluesh fringe on the wheel.The wheel is black,but the G5 turned half of it to blue

:> (

ANAYV
Dave D. said:
Cuong Phan said:
my point: The higher the ISO, the more purple fringing. The
higher the aperture, the less purple fringing. Note that higher
ISO gives you more noise. Fore example, ISO 400 with f/8.0, purple
fringing is the least, but there are lots of noise. Therefore, I
think the best setting is ISO 50 with apertures between f/4.0 and
f/5.0. Please examine carefully.

Hope this helps some people get an idea to avoid purple fringing.
Click to expand...
That's a interesting test, thanks, but it might give some people
the wrong idea about the G5, in real world shooting I have only had
the purple fringing show up on bright indoor lights like in this
shot I took this weekend, look at the ceiling lights and you will
see what I'm talking about.
http://www.pbase.com/image/23561099/original
--
http://www.pbase.com/davedent
Click to expand...
 
Why are these people telling me it's color cast or WB then? I'm confused...

BTW, that shot of the tower was taken at f/8, I can't step down any more with my G5!
Man-Fai Wong said:
Man
Robin P said:
Dave,

I just posted a message asking for help concerning what looks like
to me the same phenomenon as you have with the ceiling lights, and
I was told this was not CA but color cast. What do you think?

http://forums.dpreview.com/forums/read.asp?forum=1010&message=6740293
Click to expand...
--
Baseball as a metaphor for life?
Well, 'luck is a residue of design.' --Bill Dickey--
email: [email protected]
gallery: http://www.pbase.com/mandnwong
Click to expand...
 
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