Why is everyone still obsessed with 6×7?

“I just wish someone would make a proper 6×7 camera.” It’s the logical endpoint of every discussion in which someone loftily dictates that modern digital medium format is somehow not “real” because it doesn’t follow the conventions of film photography. And I have to say, I just don’t understand it.

Is it nostalgia for a camera regretfully parted with, or a yearning for something we never got to have? That waist-level viewfinder experience that looked so cool when David Hemmings stood in for every ’60s British (male) celebrity photographer in Blow Up. Or, instead, memories of that family member with a lovingly assembled collection of Bronica or Hasselblad 6×6 gear?

I have to assume that it’s something like this, because it doesn’t make sense in reality. Unless a radically different (and much cheaper) sensor technology suddenly arrives, no one is going to make a new 6×7 system. Or 6×6. Or even 645.

The reason is twofold. The first is that it would be utterly unfeasible, economically. The second is that it would be completely unnecessary.

The economics don’t work, not even nearly

Film scales much more readily than semiconductor size: the cost of doubling the size of a piece of film is within the realms of double or triple. A single-digit multiple, anyway. Doubling the size of a sensor more than doubles the production cost. Doubling it again starts to look exponential. You can’t just pick an arbitrary size that film cameras used to use and say, “I want it that big.”

Phase One will sell you a digital 645 camera, if you’re insistent on getting a digital camera that would also conform to film-era expectations.Phase One

The only modern 645 camera is the Phase 1 IQ4 150MP digital back. It costs around $50,000. Sony has just announced a movie camera with a similarly-sized chip. Its price hasn’t been made public, but it’s primarily going to be rented for use in productions with budgets that start with nine digits.

And that’s before you consider the fact that there aren’t huge caches of medium-format lenses that would shine under the scrutiny of high megapixel sensors, much less any financial motivation for any surviving company to support them. So on top of the fabulous cost of the sensor, you’d also need to fund the development of a whole new camera and lens system, to be amortized between an infinitesimal audience.

But beyond the economic impracticality, there’s a question of what you’d gain.

How much better do you need?

Yes, larger sensors can generally tolerate more light, per whole image, and hence deliver higher signal-to-noise ratios, meaning cleaner images with improved tonal quality. And, in principle, it should be easier to design a lens that resolves the higher resolution that a larger sensor could bring. These are exactly the reasons that medium-format film cameras existed in the first place.

Digital full-frame cameras produce very high image quality. And if that’s not sufficient, the 44x33mm medium format cameras from Fujifilm and Hasselblad are even better.Richard Butler

But it’s worth recognizing that modern digital sensors outperform film by almost every metric. There’s a difference in the handling of highlights, but modern sensors deliver more detailed images with better tonal quality, even if you only consider shooting in good light. And they do so to the point that they challenge the quality of film at least one format larger. You can rival 645 film performance with a modern full-frame digital camera, if you expose it well, and if there’s any question about that, you can always move up to a 44x33mm digital camera.

The quality you can get from a 44×33 medium-format sensor is sensational, which rapidly diminishes the applications that require anything more. Which just makes the overwhelming additional costs that come with it much harder to justify.

If you need the very best image quality available, you can spend that $50,000 and buy a Phase One IQ4. And a bit more on lenses.

But until you’ve bitten that particular bullet and found the results lacking, it’s hard to argue that any company should sensibly try to embark on digital 6×7 for you. Because, seriously, what is it you’re really hoping to achieve?