Re: Canon EOS 700D (T5i) Producing 72 dpi images
Just noticing the same thing in Windows Photo Viewer.
Two images (camera image quality comparison) shot, one on my new Canon EOS 6D MkII with 24 Mp Full-Frame sensor. The other image shot on Nikon D5000 with 12.3 Mp Crop Frame APS-C sensor. The Nikon is a 7 year old camera.
Surprisingly the Canon (full frame) reports its DPI as 72.
The Nikon image shows its DPI as 300.
The on-screen images both viewed at 100% look identical in size and resolution.
That seems to confirm the value is not relevant at least in windows photo viewer.
They were both shot with 300mm lenses.
I'm still scratching my head at how the Nikon is matching the Canon on image quality.
It must be that I am only seeing the central area of the image from both cameras and hence the crop factor is irrelevant. Any comments on this?
Don't throw away your crop sensor camera just yet - LOL!
The Nikon D5000 image first.

The Canon 6D MkII image.

Both images shot within a couple minutes of each other. Both with 300mm non-image stabalised lens (so camera shake a factor, but I took the best of 4 from each camera).
That tree also fooled the Canon Sensor (using just the central focus point and clearly not placed over the tree) at least a couple of times.
A bit of a surprise for anyone upgrading their crop sensor camera to a full-frame.
Both shot with Aperture Priority at F/7 and ISO set to my normal daytime 400.
The Canon set to - 1/3 exposure comp. I forget about that being set.
When I first saw the images on camera, the Canon looked way better, but I realised the Nikon LCD is much lower resolution (2013 standard). Once off camera I would say the Nikon just edged the photo challenge.