I'll call that well, we'll call that a focus because it will be a focus.

We have focused on the worst case scenario.

So what's the reality?

And what we want to do is, we want to find out the coordinates of the focal points.

Focal length

Focal

Focal Length

Focal blur

Focal point

First Focus

Second Focus

Focal Length

Focal length

And this is f2.

And it's for focus.

Focal length of the lens

Well, we just used the distance formula.

Or they can be, I don't want to say always.

That's the point.

Something really weird is going on here.

That's our directrix and it has the equation y is equal to k.

We focus on Parker. And move it.

Show camera aperture and focal length

Construct an ellipse with this focus

Now what do those differences look like?

Well, the first thing you do is though I've never well, we could just figure out the focal length just by plugging into the formula.

Ellipse by Focuses Point

Construct a conic with this point as focus

Set here equivalent focal length assuming a 35mm film camera, in mm. A value of 0 means the focal length is unknown.

Let's take it right there.

35mm equivalent focal length

That's this distance right there.

And that's what we set out to figure out in the beginning.

And you enter that space, and you feel like, Wow!

Requires great focus.

Just focus.

Bifocals.

Your focus,

Remember that c was the 0th element of cd.

Construct a hyperbola with this focus

Construct a parabola with this focus

Hyperbola by Focuses Point

That's just this distance right here.

Focus your camera on the flower.

But where's the focus point?