Somewhere I read that two lenses are required to create a DSLR effect- Blurring the background. But today I read, the Aperture size is responsible for blurring the background,

So any lens (single camera) with a large aperture will blur the background, so No need to add another one.

In my iPhone X, there are two lenses- wide angle and telephoto lens, so does that mean wide is used for closer objects and telephoto is used for distant objects. ??


Two lenses are required to create a sort of 3d effects in portrait pictures?


1 Answer 1


On small focal lenses (and the small sensor size of the phone requires small focal lengths), there is a very wide depth of field, so you don't get any significant background blur.

The second lens has a different perspective from the main one, and software can deduce the distance of objects from their difference between the two images, from which you can synthesize a pretend focus blur.

  • \$\begingroup\$ Yes. You can also say that the baseline between the lenses takes over the function of a large aperture, i.e. to perceive depth. Just like with our 2 eyes we can see far more depth than with 1 tiny pupil. \$\endgroup\$ Jul 10, 2019 at 12:02

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge that you have read and understand our privacy policy and code of conduct.

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