The issue is with the camera, and it is a ridiculous oversight from MS in an expensive, flagship product aimed at those looking to improve their productivity. A fixed focal range does mean you will get very blurry and unusable pictures from anything below the focal distance and no software sharpening can fix this as someone has already pointed out. Also this is a hardware limitation and cannot be fixed by firmware updates. I use my SP3 in a corporate setting and while taking handwritten notes in OneNote that are then OCR'd is a fantastic option, I often have whiteboard notes and printed meeting handouts that I need to capture. Using the SP3 to quickly snap those and add them right into the note would have been, I thought, a no-brainer. Instead I need to use a second device to take the photos, upload to OneNote, then go into OneNote, sync the SP3 and then cut and paste the image from the new note, to the old note with the handwritten notes.
Or I can buy stick on bifocal lenses from Ebay, sticky tape them to the SP3 which reduces the focal range to the right length, and then of course fight with OneNote 2013 not being able to recognise the inbuilt camera anyway, or use the OneNote Metro app which has none of the features of Office Lens so I get an awkward, low light, but in-focus copy (a colleague showed me Office Lens on his Win8 phone and it is truly marvellous and again I cannot understand why that tech isn't in everything MS has with a camera).
This is why in two decades Apple has gone from half the value of Microsoft, to double it. They work on all aspects and make them usable rather than MS who work on perfecting a few aspects and then shove any old crap in to fill the holes.