No you can't, you need to know the metric size of the pixel and the focal because essential matrix is in the real world.
Firstly I guess this question might be duplicated, but I couldn't find it.
Question. It's actually in the title.

Can I get Essential Matrix from Fundamental matrix with few matching keypoints, but without intrinsic parameters?

Situation. I am trying to find Essential matrix. I use my phone camera to take photos, and then extract keypoints using SIFT(or ORB). I have 2 images of an object and it's matching points. I could get F, Fundamental Matrix but I have no idea how to get Essential Matrix from this.
I don't have camera intrinsic parameters, such as Fx, Fy, Cx, Cy.
I am stuck to this situation. I googled but couldn't get answers.
Let me know if it's duplicated then I'd delete this.
PLUS: I also don't have camera coordinates or world coordinates.
Can I get Essential Matrix from Fundamental matrix with few matching keypoints, but without intrinsic parameters?