Started 11 months ago | Discussions thread
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DavidWright2010 Senior Member • Posts: 1,325

(I swiped that acronym from the computer geeks.)

You may remember that last year I compared the Pentax K-70 (in pixel-shift mode) with my SD1M and DPxM cams. At that time I found that the Pentax had better resolution than any of the Sigmas except for the DP3M.

My technique has improved a bit since then, and I have even 'dipped my toe' in the ocean of RawTherapee processing, which has a template now for Pentax PS processing.

I was out today trying to capture some vineyard colors (sadly, almost all the local vineyards now have fences and 'no trespassing' signs), so here's a comparison of the K-70 and DP3M. I shot both cams at f/5.6, manual focus, delayed shutter, and from the same tripod. The K-70 was zoomed to 50 mm but the photo says it was really 48 mm. Focus was on the red leaf in the center.

First, the zoomed-in comparison - RawTherapee on left, SilkyPix center, and Sigma right:

And here are the (half-sized) images:

K-70, RawTherapee

K-70, DCU 5.6 (uses the SilkyPix engine)


(BTW, whenever I am out with the Pentax and a tripod, I shoot everything that might possibly be stationary in PS mode. Memory cards and external hard drives are cheap.)

My take-away on this is that the K-70 is an inexpensive way to experiment with pixel-shift. For the kind of photography I do, only gale-force winds prevent me from getting a decent result from pixel-shift. I only wish that Sigma would make more lenses for the Pentax mount.


 DavidWright2010's gear list:DavidWright2010's gear list
Sigma DP1 Merrill Sigma DP2 Merrill Sigma DP3 Merrill Sigma SD1 Merrill Pentax K-70
Sigma DP3 Merrill Sigma SD1 Merrill
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