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I own a Olympus EM5 Mark 2. When reviewing my pics through the viewfinder, during playback, I have noticed that some of the pics show slight pixelation at max magnification (x14). This is not evident when I view the pics magnified on the LCD screen. Image quality is not affected when I process the pics in either Lightroom or Apple Photos. It seems to happen mainly in bright light, and appears on all lenses. Is this anything to be concerned about?

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    One thing to keep in mind, if shooting RAW only, is that you're viewing the embedded preview, which doesn't have the full resolution of the file (at least in the case of Olympus; 3200x2400 in the files I've seen). – junkyardsparkle Feb 26 '17 at 21:52
  • @junkyardsparkle That information needs to be in an answer, not a comment. – Michael C Feb 26 '17 at 23:57
  • @MichaelClark It's really not an answer to this specific question, though - I don't actually own any Olympus cameras with viewfinders and can't say why pixelation not visible on the LCD would show up there... – junkyardsparkle Feb 27 '17 at 3:41
  • If the pixelation is like JPEG compression artifacts, it might also be that the file you're previewing is a JPEG that is generated from the RAW file. In other words, the camera may not show the preview directly from the RAW file, but converts it to a JPEG (or uses the JPEG imbedded in the RAW file) and then displays that to you. – Mike Dixon May 5 '17 at 14:32
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Many camera bodies can enlarge preview images beyond 1:1, which would result in the image becoming pixelated. The manual for your camera doesn't give any clear indication of whether or not this is the case for yours.

Your camera does have an indication of what part of the frame is being displayed; you might check to see if it changes color at some point in the range of zoom settings, which may be an indication that you're at 1:1 or beyond it. (Again, there's nothing in the manual about this.)

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It is normal to see pixelization beyong 100% magnification. In the case of the E-M5 Mark II, 14X is way beyond that. It should be at 100% before 7X actually.

Given that the LCD has a lower resolution than the EVF, it takes more zooming in to achieve 1:1 pixel ratio which is why so see magnification before on the EVF.

Very few cameras tell you when 100% magnification is achieved. I recall the Pentax K-3 does when reaching 8.3X and there are some cameras, from Canon if my memory serves, that allow a custom setting to jump directly to 100% magnification. Otherwise, you just have to learn and remember the right zoom level to get a 100% view.

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