Sigma 10-20mm VS NEX ultra wide converter
Here’s a quick comparison using the Sony A580 with the Sigma 10-20mm F/4-5.6 lens at 12mm, and the Sony NEX-C3 with 16mm F/2.8, and the just reviewed VCL-ECU1 ultra wide converter. The equivalent coverage with each set-up is 18mm in 135 format, or more commonly full frame.
Both test images were taken at F/8, which is optimal for each lens, meaning the whole image is about as sharp as it’s going to get, if you stop down to F/11 the centers and mid-sections soften a little bit, but the extreme corners sharpen up just a hair. Each image was saved as a jpeg.
The ultra wide converter is not handling the very small details too well in the mid-sections, the chain link fence in the background is almost gone, as is some of the bark detail in the tree branches, however, the corners seem quite similar between the two…
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