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Forum: Pentax Full Frame
10-30-2017, 06:39 PM
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Exposure parameters are the same regardless of sensor format, since the amount of light per pixel remains the same. There's more sensor area to capture that light, though, hence more data overall.
What you get from a larger sensor format is usually (a) more resolution, (b) more dynamic range and better color accuracy, (c) less noise, (d) the option of using higher ISOs without negatively impacting the image quality. Beyond this, there are changes in lens selection, since it's easier to build high-quality wide-angle lenses for FF, and the same focal lengths give a wider field of view (=shallower dof -> fancier bokeh).
Note that if you are not shooting in RAW then you're throwing away a big chunk of these advantages. Also, as the K-70 is quite good in its own right, you probably won't be able to appreciate the difference unless you feel constrained by print size, lens selection, etc. It will take a bit of experimentation both out in the field and in post to make the most of your new camera.
What 28mm lens are you using on the K-1? The Sigma 18-35mm is an exceptional lens, and to match it you'd want an equally good lens on your K-1, such as the Samyang 24mm F1.4 or Pentax 15-30mm.
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