[Brightcolours]

1.6 to 1.34! The lens also covers the new Sigma Foveon APS-H. 

 

You were referring to the lens, not to the limits or crop factor of Canon APS-C size. Ignoring the speed of the lens, which is the reason for it's size, price and weight is the result of this silly equivalence games.

 

You also would not "equivalent" a remote controlled model racing car going up to 100 km/h to be 2000 km/h fast because the genuine "FF"-car model is 20 times bigger. 100 km/h = 100 km/h.

 

Also, FF is just one of many sensor sizes. Given the amount of phone cameras and their sensor sizes, there's no reason to declare FF to a reference. Not many of today's daily camera users ever took pictures on film - or full frame cameras, which are NOT the center of photographic world anymore. So, I think it's better to use the true specifications and not equivalence numbers.

Very often we talk about cellphone cameras in equivalent to FF terms. 

 

"True specifications" say NOTHING what so ever, without reference point. In fact it says so little, that Apple will not even bother mentioning the focal length(s).

Sorry that it irks you so much, when people want to know what a lens compares to on other formats. But yeah, people DO want to understand how lenses compare. They DO want to know that an iPhone 6s has a "31mm FF equivalent" lens, so they understand "ohhh ok, so kinda moderate wide angle".

 

But you say you rather have the "true specifications". Ok, the iPhone 6S has a 2.65mm lens. That is not that informative, is it?

 

And that is just for the front lens. The back lens is 4.15mm. Informative, right? And what does that tell you? 

Hmm.. not much. It seems much less wide. But luckily, we can talk about what it is equivalent to. 29mm FF equivalent. So, wider instead of less wide. Yay for equivalence!

 

We just use FF as reference point, because it is an easily understood reference point. But we can use any other reference point. But none make more sense, most just make things less clear. Because most people with any idea about photography do know what 35mm on FF will mean, or 50mm, or 200mm.