you know how funny the f-stop scale is. All those weird numbers that make no sense.. (well, they do make sense if you look at the square roots of powers of two, but this is really not making anybody’s lives easier).

Griffin Hammond came up with a clever trick to remember the entire scale of F-Stops using only two numbers: 1 and 1.4.

The secret to the method is making a series of numbers that starts with those two numbers and then the next member is the prev-prev number times two.

So, it’s 1, then 1.4, then 1×2=2, then 1.4×2=2.8, then 2×2=4, then 2.8×2=5.6 and so on.

[Griffin Hammond via nofilmschool]

**P.S.** 1.8 is not a “round” f-stop number

Svante Ekholm Lindahl says

Well duh, it’s in the definition of aperture number. And it’s actually multiplication by the square root of two each full stop (1.4142…).

nacezavrl says

And that is useful for what?

Graxxor Anandro Vidhelssen says

generating clicks, apparently.

Amede Phonon says

F(n)=sqrt(n).

Kryn Sporry says

So actually you need to remember 1, 1.4, and 2, because everything is multiplied by 2. Convenient trick though.

Mike says

Like you need to do addition to learn a 6 number sequence. You can remember your phone number hopefully.

Arthur_P_Dent says

Really? Is it that hard?

Timo K Ripatti says

The multiplication lineup changes with f/11, because that should write f/11.3 – resulting that f/22 is actually f/22.6 and f/45 is again a rounded value.

For practical reasons, it is not all math.

pincherio says

f/11.2 (pet peeve)

Dimitris Servis says

Isn’t that how everybody is doing it since decades

Bill McKenzie says

Are people still using f stops with digital?

TByte says

Photographer people are.

Graxxor Anandro Vidhelssen says

Only people who use digital to take photos.

Rosalie R. Rankin says

Tomorrow: NWO’s agenda = One world religion!

Graxxor Anandro Vidhelssen says

“a clever trick to remember the entire scale of F-Stops using only two numbers: 1 and 1.4.”

Like a clever trick of multiplying two numbers by learning multiplication?

which in any case breaks down at 5.6 x 2 since the F stop is 11.

It’s not a trick, in so much as learning your √２ times table.