Tim
Active member
Hi all,
There has been a lot of discussion on the web with regards the Sigma DP2 Merrill and green/magenta casts.
Many believe the IQ from the DP3 to be a little better than the DP2M, the files being cleaner more neutral.
I generally don't notice much in the way of casts in my DP2M images but have seen some bad examples here and there. I am wondering if a possible reason is the use of a UV or skylight filter? I did apply one on my DP2M for a while. I would leave the lens cap off, camera at the ready, all I had to do it power up and shoot. I did notice a change in the files. I've since removed the filter.
Over on Photographers Lounge it was noted that a Sony RX1 was yielding distortion on the left and right edges of the image. The culprit was no other than the UV filter. It somehow making people and items on the frame edges fatter. Strange but it was reproducible effect.
This led me to ponder what effects a UV filter has on any sensor/lens, but in particular if DP2M users would chime in. Do you use a UV on your Sigma? Have you tried images with and without?
The filter I had used was a Kenko. Perhaps some brands are more suitable.
I think I am now a no filter convert.
On another note I recently tried an older Olympus polariser, it was a circular type but the resulting images looked like there was haze or fog. The reverse of what was wanted was achieved.
Thanks in advance.
Tim
There has been a lot of discussion on the web with regards the Sigma DP2 Merrill and green/magenta casts.
Many believe the IQ from the DP3 to be a little better than the DP2M, the files being cleaner more neutral.
I generally don't notice much in the way of casts in my DP2M images but have seen some bad examples here and there. I am wondering if a possible reason is the use of a UV or skylight filter? I did apply one on my DP2M for a while. I would leave the lens cap off, camera at the ready, all I had to do it power up and shoot. I did notice a change in the files. I've since removed the filter.
Over on Photographers Lounge it was noted that a Sony RX1 was yielding distortion on the left and right edges of the image. The culprit was no other than the UV filter. It somehow making people and items on the frame edges fatter. Strange but it was reproducible effect.
This led me to ponder what effects a UV filter has on any sensor/lens, but in particular if DP2M users would chime in. Do you use a UV on your Sigma? Have you tried images with and without?
The filter I had used was a Kenko. Perhaps some brands are more suitable.
I think I am now a no filter convert.
On another note I recently tried an older Olympus polariser, it was a circular type but the resulting images looked like there was haze or fog. The reverse of what was wanted was achieved.
Thanks in advance.
Tim