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Tariq Gibran wrote:
From your article:
"...I started thinking of the K3 with the 15MM lens as an alternative to my Canons with TSE lenses."
Perhaps a lens like the Samyang 14mm would be a better choice for architecture and landscape use where you need to get the most out of the sensor across the frame vs. the Pentax Limited 15. I say that as the Pentax 15, while one of the sharpest wides I have used centrally, falls off in sharpness quite a bit outside the center. It's image circle also barely covers APS, making it less useful for the Pentax sensor shift option (as I found out when I tested it on my A7r). The drop off in sharpness could be due to field curvature, I'm not sure. For critical work, it's not really ideal if you need to maximize image quality at the borders and corners (such as for some architectural and landscape work). It would be interesting to hear though what you found with the closer interior type shots as maybe the field curvature (if that's the cause for the drop in sharpness) could have worked to advantage? For more distant subject matter, it's an issue....Show more →
Thank you for your comments, I appreciate them. If the work is critical, I would use my Canon bodies with the TS-E lenses. I made the point in the article that this was a solution for my travel photography, not for my assignment work. As to the the various lenses available for the Pentax, again, to make my life easier when I am traveling, I prefer a lens that communicates with the camera, which I believe the Samyang does not, and I like the AF option as well. The 15MM Ltd is also very compact and light in weight, another requirement for travel. As to corner degradation of an image, that is sometimes an issue with TS-E lenses when in full shift position as well. At some point I'll shoot a full test on the 15MM and post a review.
I have no knowledge whatsoever, of the technical and engineering aspects of lens matching to sensors, but I would I think testing the Pentax HD 15MM DA on the K3 would be the proper test, not on another manufacturers body.
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