Works with Pentax K-1 and definitely meets my expectations. I am self-taught and do not claim any knowledge. At best, it's a hobby that loves spending time in nature and taking photos. Bought in winter so I was limited in photographic subjects. I had to learn to shoot in manual mode, but the camera is very good at adjusting settings to light conditions. The photos are hand-held, but I would expect a tripod to improve the results significantly. I'm looking forward to night photography this summer. Focusing speed and accuracy is good for the way I use the lens. Sometimes it's chasing when I'm pushing the limits with close-ups, but the lens isn't meant for artistic purposes. The river scene was filmed hand-held and 100% cropped to show how well the lens and camera work together. The other two images are also held out of the hand with the K1. Post-processing was done with Photoshop Creative Cloud, NIK and Photoshop Elements.
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