On 5/25/2010 6:28 PM, C.H.Ling wrote:
> You are lucky, 5D II has very bad red channel noise, this one shot at ISO160
It's been years, so I don't remember details. I read someone who claimed
that the intermediate ISOs on the 5D were noisier than the primary ones.
So I checked, and it was true of mine, as well. So, 160 is noisier than
200, 320 noisier than 400, and so on. Since then, I've only used the one
stop series starting with ISO 100.
I have no idea whether the same might be true of the MkII, but it might
be worth checking.
> , try to convert it with PS red filter. There are lots of noise and artifacts
> everywhere, image is totally non usable:
>
> http://www.accura.com.hk/temp/IMG_4865.JPG (4.5MB)
>
I disagree, at least for this particular image. The problem is easy
enough to see. However, I don't like what the red filter does to the
mural, so wouldn't want to use it there anyway, And it doesn't do
anything of use to me on the rest of the buildings. If I use it
judiciously on sky only, it does a nice job, with only a couple of areas
of subtle mottling which are easily corrected. There is trouble in the
couple of spots where the red channel is already blown in the brightest
clouds, but that's an exposure/processing problem, not the fault of the
filter process.
It's also possible to get the sky effect using other tools after a
straight B&W conversion. In the English idiom, there's more than one way
to skin a cat.
I can certainly see that there would be other sorts of image where the
red channel problem would not be so easy to get around.
Thanks for helping me resist the MKII. ;-)
Moose
> Shoot with Tamron SP 24-48.
>
> BTW, don't expect there will be any different at ISO100.
>
> C.H.Ling
>
> ----- Original Message -----
> From: "Moose"<olymoose@xxxxxxxxx>
>
>
>
>> Here are some samples, none of which make any difference in noise that I
>> can see at full pixel.
>> <http://www.moosemystic.net/Gallery/tech/Process/BW/B&Wconv2.htm>
>>
>> Moose
>>
>>
>
--
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