29 October 2014

20-40 LimiZoom and friends

A quick outdoor test yielded little data of value.  All four lenses produced images with great colors and decent sharpness.  Color fringing was most visible on the 17-28 but its image was also the widest so you gain more view but it's not the best part of the field.  The tests were three wide (18-55@18, 17-28@17+ and 20-40@20, then all four lenses at 28mm; all were shot iso80 f/5.6, shade WB.

The one noteworthy point was between the 20-40 and Tamron 28-75 at 28mm.  Exposure data is shown as identical but the Tamron is darker by a notch; it is clear in the leaves against the tree trunk and especially in the skyline clouds.   The other images look like the LimiZoom, only the Tamron has cloud detail.  These all were jpeg/bright so processing was the same, and focus was obtained on the notch in the left-side tree trunk.  Honestly though, these clouds were moving fast... some changes just happen with outdoor scenes.  I was not planning to shoot these but the sun came out with no early notice, so I used it!

These two shots were cropped by Picasa when converted to a collage so 
more of the scene is visible on my screen for all the images.

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