I can't find the answer to this one anywhere.
When viewing EXIF data on my images (such as on Flickr:
http://www.flickr.com/photos/technosavant/), it shows as being 72dpi. My brother's Nikon D50 shows as producing 300dpi images (via in-camera processing). I was browsing through other K100D images, and saw some variation; most were 72dpi, with a few 300dpi mixed in. I can't find one single thing about it in the manual.
So, I wonder:
1) Exactly WHAT does the dpi of a given image matter if the resolution is the same? It seems like it is a spec without a context, especially if the resolution is identical.
2) Is there an in-camera setting I just can't find? Admittedly, I am shooting JPEG in best quality, but if the answer is to shoot RAW, I guess more memory cards are in my future.
3) Should I just get over it and tell my brother that it doesn't matter?