JensR

> Come on, it's a 150mm f/1.8 lens.

It is not a 150/1.8 lens. It is a 75/1.8 lens.
It has the same FOV, DOF and captures the same number of photons per time as a 150/3.6 lens would on "full...

HI Eric! Even if I am in M on a two-dial camera, I never change both at the same time, it feels it loosens my grip. So there's no speed advantage. With one dial, I have to press an additional...

Hi guys! Every cost to the manufacturer gets multiplied by 5 or 10 (depending on the industry) until it reaches the hands of the consumer. A dial has implications on design, manufacture,...

*punch*
Sorry, must have misread your request ;)

I detect a sarcasm leak here.

Osam, how do you get from "repairing broken parts" to "sharing an operating system"?

I'm pretty sure that they did mean full-time manual focus. This type of motor allows full time manual override of the autofocus.

> Cropping, however, doesn't reduce DOF

So very very wrong.

The light densities (photons per area and time) of all f/2 lenses are the same - but I never said anything else.
But an f/2 lens on "full frame" will cover roughly twice the area than f/2 on...

No, it's completely true - everything I said. I said "number of photons" - not "density of photons".
It's simple physics, but I have realised by now that people are very reluctant to accept it....

The X10's lens is a 7.1-28.4mm f/2.0-2.8.
If you want to compare that to a lens on "full frame", this can be done, but not by multiplying only one set of those numbers.
The X10's lens is...

Yes, this works - Sigma (IIRC) even had a two-piece lens-cap for that purpose. I have used cardboard cut-outs. I have tried with centred holes, though. It was mildly successful to increase exposure...

Of course you have to multiply the f-stop as well, as the f-stop is a measurement including the focal length and the aperture diameter. The same aperture diameter (and equivalent f-stop) lets...

That's interesting, I think.
Live view focusing will mean that the relatively shallow DOF is less of an issue. Maybe it will even take normal front-mounted filters?
The small size will make its...

April 1st yet?!

Sorry, I mad a mistake.
No more selective colouring for me, either.

No, Jacques, this was not an excellent summary by Zvonimir.

The distinction between "total light" captured (number of photons) and "light density" (photons per area) is crucial with sensors of...

Nikkor:
There are no _equivalent_ 4/3 lenses to a 24-70/2.8 - this would be a 12-35/1.4.
Otherwise, I agree, horses for courses, just make sure to compare properly.

Vlad:
Equivalence is not...

Comparing to FF is not odd or flawed.
If the prices stay as announced, the FT f/2.8 lens is more expensive than a "FF" f/4.0 (or f/5.6) lens that has better (or the same) DOF control due to the...

Actually, the physical aperture (=diameter) of 12/2.8 on FT and 16/3.6 on APS-C are the same. The F-number is different, though (obviously).