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Product of the future . . . but not of the present!
on November 21, 2010
The sigma camera line is built around a sensor, the Foveon, that is technically different from any other.
Since it comes closest to film in registering color, it produces images with drop-dead gorgeous color range and detail. Color is more true to life, and required virtually no post editing. The problem is that the image size itself. When it comes to enlargements later you'll discover that your pictures are less than 5 megapixels each-- very small files. This translates into postcard size prints. The "14 meg image" that Sigma markets refers to the fact that each pixel can register ALL three basic colors, red, blue, and green (which requires three pixels on ither systems). However the number of these pixels is less than 5 million, so images are too small for larger prints or even significant cropping.
I sadly had to return my Sigma after discovering this fact, while on trip for which I had specifically purchased the camera. I reverted to film temporarily. That being said, if you are happy posting to the web or just need small prints, Sigma is unmatched. My one criticism of Sigma is that they do not spell this out clearly in their literature. There is some good news though, a 46 megapixel version of the 15 is due early in 2011, and this will have a 14-15 meg sensor (in terms of resolution). This camera should be a remarkable product if you can wait.
Finally, because sigma is not widely used and Foveon is not based on the so-called Bayer filter technology used by every other camera company, some programs like Apple Aperture do not support RAW image files downloaded from the camera--however I found the supplied software more than adequate, and no color modification was even required on the native files.
Hope this helps, Eric