this guy does a terrible job of describing the issue:
Saying that, the Mk IV's higher resolution proposition is something you'll want to contemplate carefully. There's a phenomenon that can render moving subjects less sharp than if shot with equivalent lower resolution cameras. It's because at any one point that subject will be motioning between more "pixels" on the sensor, which will influence what the camera sees at the moment the shutter is fired. Go with a shutter speed too slow and you'll suffer the consequences. In short, you'll need to use a faster shutter speed if you're moving up the resolution range. And that, typically, means using a higher ISO sensitivity.
If we could somehow replicate exactly a shot showing motion blur (camera or subject) between a 15 MP camera and a 30 MP camera, and output the image to an 8"x10" image, what would be the result in regards to the motion blur?
IMO 300ppi is the maximum any common printer/output ever needs to resolve the detail present in the image. That tells us we are sending a 2400px x 3000px image to the printer. Many printer/output combos (inkjet) would do just fine with 200ppi ... 1600px x 2000px.
15mp = 4416 x 3312
30mp = 6720 x 4480
Both have plenty of pixels to produce sharp output. I have never put together this kind of test, but my experience tells me that the final output (the print) from each camera would look the same.
The TDP above article says: Magnify the image being captured and problems not visible before become apparent.
His is a much more accurate description of the issue. Is motion blur more apparent on a higher megapixel camera? yes, it is, but ONLY when you MAGNIFY the image. That magnification can come through zooming in to 100 percent, or it could come from printing a 22" x 15" (300ppi) or a 33" x 22" (200ppi) print of the full frame image.
Steven_nl wrote in post #18181017
Would not natter if the blur is caused by the subject.
I actually own the xpro2 24mp. And i own the Mark III.
Not sure I understand what you mean by output.
Output is the end result of taking a picture, it is what anyone other than the photographer views. It could be a 800 or 2000 pixel wide JPG or it could be am 8x10 or large format print.
So, IMO, if you intend to use virtually every pixel of the camera (or crop 1:1) for your output you should definitely consider using a higher shutter speed to limit any camera or subject movement. If your output is more typical of most photographer's work, don't worry about it.
a good exercise for you might be to take identical pictures with your III and IV ... motion blur unnecessary. Then with both images open, zoom in to 100 percent on the III to a certain area, then see where the same framing on the IV leaves you on magnification. My guess is 66.7 percent.
PSA: The above post may contain sarcasm, reply at your own risk | Not in gear database: Auto Sears 50mm 2.0 / 3x CL-360, Nikon SB-28, SunPak auto 322 D, Minolta 20