my first CA/purple in Best Buy !!!!

Well went today to best buy.. yeah they have F 828 .. of course one and not for sale.. they had other one but some guy came about 10:30 am and bought.. so I will have to waith till monday-tuesday.. again pis* d off.. anyway I made quick shoot.. and this is what I've got:

http://www.pbase.com/image/24943953

yes there is purple.. but I do not know what I should think about it? I touch F - 828.. mmmmmmmm nice very nice.. didn't have to much time for play.. but I love it.. the only reason why I'm writing here.. what do U think about pic? Is there anything bad.. I mean to much purple.. ? I didn't check serial no. so I don't know which one is it.. I have feeling that on this one is to much purple.. let me know guys.. whatever will happen I will have F 828.. even if I will have to wait next month for other model/serial no.. maybe with less purple ..

adam

As you can see, it is not so difficult to reach these kind of special effects with the F828. (just kidding!)

If you wrote:
... "my first"... it is because you definitely are going to buy one F828.

You will lerarn how to enjoy another F828 features and play around with the CA.

Have a nice one!

bqwert said:

Well went today to best buy.. yeah they have F 828 .. of course one
and not for sale.. they had other one but some guy came about 10:30
am and bought.. so I will have to waith till monday-tuesday.. again
pis* d off.. anyway I made quick shoot.. and this is what I've got:

http://www.pbase.com/image/24943953

yes there is purple.. but I do not know what I should think about
it? I touch F - 828.. mmmmmmmm nice very nice.. didn't have to much
time for play.. but I love it.. the only reason why I'm writing
here.. what do U think about pic? Is there anything bad.. I mean to
much purple.. ? I didn't check serial no. so I don't know which one
is it.. I have feeling that on this one is to much purple.. let me
know guys.. whatever will happen I will have F 828.. even if I will
have to wait next month for other model/serial no.. maybe with less
purple ..

adam

Click to expand...

You might want to give Circuit City a try, they have them in stock here where I live as well. I've heard some CompuSA's also have them. I was lucky, my local Best Buy had 3 of them yesterday so I picked one up there.

bqwert said:

Well went today to best buy.. yeah they have F 828 .. of course one
and not for sale.. they had other one but some guy came about 10:30
am and bought.. so I will have to waith till monday-tuesday.. again
pis* d off.. anyway I made quick shoot.. and this is what I've got:

http://www.pbase.com/image/24943953

yes there is purple.. but I do not know what I should think about
it? I touch F - 828.. mmmmmmmm nice very nice.. didn't have to much
time for play.. but I love it.. the only reason why I'm writing
here.. what do U think about pic? Is there anything bad.. I mean to
much purple.. ? I didn't check serial no. so I don't know which one
is it.. I have feeling that on this one is to much purple.. let me
know guys.. whatever will happen I will have F 828.. even if I will
have to wait next month for other model/serial no.. maybe with less
purple ..

adam

Click to expand...

why?

cause I have Gift Card from them.. I can't change for money.. I must buy something in Best Buy.. anyway I was trying ask maneger to keep one f 828 for me next week.. he said that he can't.. so I will have to go monday at 10 am.. and try get one..

what was my point.. about purple.. I was just wondering if this one maybe has to much purple problem.. so maybe I should wait by next couple weeks and get some new one..

beside I love it

bqwert said:

Well went today to best buy.. yeah they have F 828 .. of course one
and not for sale.. they had other one but some guy came about 10:30
am and bought.. so I will have to waith till monday-tuesday.. again
pis* d off.. anyway I made quick shoot.. and this is what I've got:

http://www.pbase.com/image/24943953

yes there is purple.. but I do not know what I should think about
it? I touch F - 828.. mmmmmmmm nice very nice.. didn't have to much
time for play.. but I love it.. the only reason why I'm writing
here.. what do U think about pic? Is there anything bad.. I mean to
much purple.. ? I didn't check serial no. so I don't know which one
is it.. I have feeling that on this one is to much purple.. let me
know guys.. whatever will happen I will have F 828.. even if I will
have to wait next month for other model/serial no.. maybe with less
purple ..

Click to expand...

I tested a Fuji S7000 at a Best Buy a while ago and got results similar to yours, maybe not as intensely purple, but quite similar.

WARNING: Huge file - 4048x3040 (4.4 mb). Fuji S7000 (ISO 200 1/60 @ f2.8)

http://bigwavedave.instantlogic.com/Images/Photos/%7B2BBFD5FF-0119-486E-AAD3-ED6EBB1D1152%7D/%7B40D7D9EF-C961-4776-8F19-5BC16D8298DC%7D.jpg

Not trying to bash any cameras, just trying to keep things in perspective ...
--
BigWaveDave

the only different is that purple from sony is all around light.. is that not weird?? hmmmm

To me, that much CA in what seems to be a quite simple shot is unacceptable. But as you will see - it all depends on what you are willing to work with/around when it comes to the 828. Some people are willing to overlook/post process past this issue - others are not. It's up to you my friend!

--
Bauerman
http://www.bauerman.Galleries.photoshare.co.nz

The image shows nicely that the purple fringing is about the same at the centre of the image as it is further out. Unless I'm mistaken, this clearly means that it is due to something like blooming in the sensor, rather than to chromatic aberration (CA). CA happens because different wavelengths are refracted by different amounts, and there will be no CA at the centre of an image (because there is no refraction happening there).

Please correct me if I'm wrong. And please forgive me if this is old news to everyone. I haven't been able to read all the posts about the 828 - I do have a job

bauerman said:

To me, that much CA in what seems to be a quite simple shot is
unacceptable. But as you will see - it all depends on what you are
willing to work with/around when it comes to the 828. Some people
are willing to overlook/post process past this issue - others are
not. It's up to you my friend!

--
Bauerman
http://www.bauerman.Galleries.photoshare.co.nz

Click to expand...

I assure you that if I took that shot with my 828, the results would have been the same. Fortunately I don't have that type of lighting in my home or any other home where I have used my camera and have never seen so much purple in one shot.

IOW, don't let it scare you.

Here's a test shot:

http://www.pbase.com/image/24776250

And here's a shot with some PF:

http://www.pbase.com/image/24364822

at 100% crop: http://www.pbase.com/image/24364823

As you can tell, unless you blow it up to 100% on the screen, you really cannot see it.

Olga

bqwert said:

Well went today to best buy.. yeah they have F 828 .. of course one
and not for sale.. they had other one but some guy came about 10:30
am and bought.. so I will have to waith till monday-tuesday.. again
pis* d off.. anyway I made quick shoot.. and this is what I've got:

http://www.pbase.com/image/24943953

yes there is purple.. but I do not know what I should think about
it? I touch F - 828.. mmmmmmmm nice very nice.. didn't have to much
time for play.. but I love it.. the only reason why I'm writing
here.. what do U think about pic? Is there anything bad.. I mean to
much purple.. ? I didn't check serial no. so I don't know which one
is it.. I have feeling that on this one is to much purple.. let me
know guys.. whatever will happen I will have F 828.. even if I will
have to wait next month for other model/serial no.. maybe with less
purple ..

adam

Click to expand...

Just a guess. Many of those high intensity lights use mercury vapor bulbs which are very rich in both the blue part of the spectrum and ultraviolet.
This may have influenced the picture in some way..

bqwert said:

Well went today to best buy.. yeah they have F 828 .. of course one
and not for sale.. they had other one but some guy came about 10:30
am and bought.. so I will have to waith till monday-tuesday.. again
pis* d off.. anyway I made quick shoot.. and this is what I've got:

http://www.pbase.com/image/24943953

yes there is purple.. but I do not know what I should think about
it? I touch F - 828.. mmmmmmmm nice very nice.. didn't have to much
time for play.. but I love it.. the only reason why I'm writing
here.. what do U think about pic? Is there anything bad.. I mean to
much purple.. ? I didn't check serial no. so I don't know which one
is it.. I have feeling that on this one is to much purple.. let me
know guys.. whatever will happen I will have F 828.. even if I will
have to wait next month for other model/serial no.. maybe with less
purple ..

adam

Click to expand...

Howard,

I couldn't remember the "mercury vapor" expression, but that's exactly right. You can also see it in some of the street/highway lights too which also get the purple halo.

Olga

Howard Udoff said:

bqwert said:

Well went today to best buy.. yeah they have F 828 .. of course one
and not for sale.. they had other one but some guy came about 10:30
am and bought.. so I will have to waith till monday-tuesday.. again
pis* d off.. anyway I made quick shoot.. and this is what I've got:

http://www.pbase.com/image/24943953

yes there is purple.. but I do not know what I should think about
it? I touch F - 828.. mmmmmmmm nice very nice.. didn't have to much
time for play.. but I love it.. the only reason why I'm writing
here.. what do U think about pic? Is there anything bad.. I mean to
much purple.. ? I didn't check serial no. so I don't know which one
is it.. I have feeling that on this one is to much purple.. let me
know guys.. whatever will happen I will have F 828.. even if I will
have to wait next month for other model/serial no.. maybe with less
purple ..

adam

Click to expand...

Click to expand...

Robert said:

The image shows nicely that the purple fringing is about the same
at the centre of the image as it is further out.

Click to expand...

It's worse further out, but the difference isn't as dramatic as one might expect.

Robert89016 said:

Unless I'm
mistaken, this clearly means that it is due to something like
blooming in the sensor, rather than to chromatic aberration (CA).

Click to expand...

If it were caused by blooming, it wouldn't disappear when you stop down the lens and it would disappear when you boost the ISO.

http://forums.dpreview.com/forums/read.asp?forum=1009&message=7192024

http://forums.dpreview.com/forums/read.asp?forum=1009&message=7168844

Robert89016 said:

CA happens because different wavelengths are refracted by different
amounts, and there will be no CA at the centre of an image
(because there is no refraction happening there).

Click to expand...

The only point where there's no refraction would be for a ray that passes directly through the center of the lens hits the pixel right in the center of the imager.

For the rest of the image, you can get lateral and transverse CA. Transverse CA may not get worse as you move towards the edges:

http://www.vanwalree.com/optics/chromatic.html

--
Ron Parr
FAQ: http://www.cs.duke.edu/~parr/photography/faq.html
Gallery: http://www.pbase.com/parr/

Ron Parr said:

[snip]
If it were caused by blooming, it wouldn't disappear when you stop
down the lens and it would disappear when you boost the ISO.

http://forums.dpreview.com/forums/read.asp?forum=1009&message=7192024

http://forums.dpreview.com/forums/read.asp?forum=1009&message=7168844

Click to expand...

Thanks very much for these links.

Member said:

Member said:

CA happens because different wavelengths are refracted by different
amounts, and there will be no CA at the centre of an image
(because there is no refraction happening there).

Click to expand...

The only point where there's no refraction would be for a ray that
passes directly through the center of the lens hits the pixel right
in the center of the imager.

Click to expand...

You're right, of course. Silly me. Even for an object in the centre of the scene, some of the rays will have gone off-axis and will then have been refracted back to the centre of the imager.

Member said:

For the rest of the image, you can get lateral and transverse CA.
Transverse CA may not get worse as you move towards the edges:

http://www.vanwalree.com/optics/chromatic.html

Click to expand...

Thanks also for this very interesting link.

I'm still rather confused, but what's new?

On the one hand, when I put a Hoya close-up lens on my F707, for example, I get stronger CA farther away from the centre of the image but none at the centre; and the relative positions of the 2 different fringe colours are reversed from top to bottom and from left to right. This seems like what van Walree describes as transverse CA, but you say that TCA 'may not' get worse towards the edges. Perhaps it just appears to be less in the centre because the effects are cancelled out for rays from, say, above and below?

On the other hand, purple fringing sounds like what van Walree describes as longitudinal CA. You seem to imply that LCA is expected to get worse towards the edges, but after looking at Adam's Best Buy image again, with a magnifying glass, the fringing looks to me to be practically the same everywhere.

I don't have all the answers, but my guess is that we're seeing multiple types of CA at the same time here, so depending upon aperture and focal length, some types may be more prominent than others...

--
Ron Parr
FAQ: http://www.cs.duke.edu/~parr/photography/faq.html
Gallery: http://www.pbase.com/parr/