Originally posted by Mazzoman Hello everyone. I was under the impression that an FF would increase the shutter speed at the same fstop and ISO given that the sensor gathers more light when using the same lens. And that ISO on crop was actually equivalent to 1.5 FF ISO. So I went ahead and purchased the k1 and compared it to my k70. It turns out that nothing changes and to my eyes, high ISO performance up to 1600 is pretty much the same. Where exactly is the advantage of investing 4x the dollar amount except for the 36mp output. I used a sigma art 18-35 on crop k70 @ 18mm and the same lens on its equivalent 28mm (perfectly usable with little vigneting. Any thoughts?
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.
Adam
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