2
\$\begingroup\$

Why does a smaller aperture size have a high depth of field? What is the physics behind this?

Improve this question
\$\endgroup\$
3
  • 1
    \$\begingroup\$ @PhilipKendall This isn't a duplicate. The linked answer states the aperture results in DoF but this person already knows it, and is asking about the physics behind it. \$\endgroup\$
    – Hairy Dresden
    Commented Mar 16, 2018 at 15:30
  • \$\begingroup\$ @HairyDresden - a) the OP has the premise in reverse & b) did you look at the 2nd answer on the dupe? \$\endgroup\$
    – Tetsujin
    Commented Mar 16, 2018 at 15:41
  • 1
    \$\begingroup\$ We do have the technical question too. \$\endgroup\$
    – mattdm
    Commented Mar 16, 2018 at 16:05

1 Answer 1

Reset to default
0
\$\begingroup\$

Why does a smaller aperture size have a low depth of field?

It doesn't; you've got it backward. Decreasing aperture size increases depth of field.

What might be confusing you is that smaller f-numbers indicate larger apertures. For example, an aperture setting of f/2 indicates a larger aperture than does f/2.8.

Improve this answer
\$\endgroup\$
1
  • \$\begingroup\$ I edited the question. Sorry my bad! \$\endgroup\$
    – physics2000
    Commented Mar 16, 2018 at 16:12

Not the answer you're looking for? Browse other questions tagged or ask your own question.