He said that the biggest advantage of 120 megapixels is not the massive prints that you could make, or even the incredibly deep cropping that you could do, but that you could create multiple photographs from one exposure. For example, you could go to Tunnel View at Yosemite National Park and, with one exposure, make separate photographs of El Capitan, Cathedral Spires, Bridalveil Falls and Half Dome.
|Tunnel View Monochrome - Yosemite National Park, California|
But why would someone want to do this?
Sometimes you might have a great scene with great light and great but quickly changes conditions, and there are multiple elements that you want to capture. Instead of picking one and hoping you'll be able to capture the others before things change, you'll now be assured that you've captured it all.
Lazy people might see this as an opportunity to capture a scene and then decide later if there's anything interesting going on. They might see this as similar to the Lytro "light field" camera where they can decide after capturing an image where to focus, only instead of focus they're deciding on composition.
Some challenges are depth-of-field and focus. I imagine if you're using this method that you are likely using a wide-angle lens. You will want a depth-of-field that is large enough to ensure the whole scene is sharp, but you'll run into diffraction if you use too small of an aperture. You'll want to pick a spot in the "middle" of the scene to focus so that the foreground and background have a chance of being in-focus. It might be a bit tricky to get everything just right but I'm sure with some practice you'd figure out exactly how to best accomplish this.
We both agreed that this isn't the best way to capture great photographs. It seems that it could be a thoughtless way to capture images. Thoughtless is the opposite of creative, and creativity is an essential element of photographic vision.
|McWay Falls View - Big Sur, California|
It's interesting to think outside-the-box about this, but it seems as though making multiple photographs from one exposure isn't the best method available, at least not under normal circumstances. I can see how on a very rare occasion it might come in handy, but I don't see it being worth the headache of constantly dealing with massive file sizes and the extra cost (because I'm sure the camera won't be cheap) just for an occasional advantage that you can likely work around anyway with the gear that you already have.