The (in)significance of resolution

Started Apr 15, 2013 | Discussions thread
DaSigmaGuy Forum Pro • Posts: 12,308
Correction...Because the edit function isn't working!

DaSigmaGuy wrote:

Lin Evans wrote:

Hi David,

You really haven't increased resolution at all with what you have described below. You simply have increased the field of view composing the scene.

Nonsense...Take two DSLR's with identical size sensors, one with 20mp and one with 10mp.  If you use a 40mm lens on the 20mp camera it will capture exactly the same resolution as the 10mp camera if its fitted with an 80mm lens.  But if you use a 80mm lens on the 20mp camera it will capture twice the resolution as the 10mp camera.  In other words, for a given focal length lens, resolution of each frame you take is entirely dependant on the sensor or film you use, plus the optical quality of the lens.   Stitching shots increases resolution in exactly the same way that increasing the sensor or film frame size does.

In Daves case, frame A + frame B + frame C = 3x the resolution of a single frame, minus the stitch area between frame A and frame B and between frame B and frame C, which is always required when you stitch several frames together in order to blend the shots seamlessly.  Say 3x res minus 10-20%...Its still a significant increase in resolution over using a single frame.

This is why so many people who only have low res cameras, take the trouble to stitch multiple shots into a multi row panoramas...Because it increases resolution!

The reason Dave didn't see any difference in his same size prints from various cameras is simply because his printer doesn't have a high enough print resolution to render the extra image resolution onto the print paper (Not enough DPI).  The solution is buy a higher res printer, but that would cost a lot of money.

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