How we see 3D??

A stereo image is basically a 3D image. We have seen a lot of “virtual reality headsets” in 2015( Learn more about VR here, I have a bunch of articles on VR Google VR, VR vs Hologram, Best apps for Cardboard VR, How to make a cardboard VR DIY). If we look at the phones screen without the VR set, the image we see is a stereo image. The image below is a stereo image.


When we look at an object, both of our eyes looks at the same object. Two set of images are formed, one with each eye. Then our brain manipulates and merges both images to give us a 3D view.

So, now we get an idea on how we see in 3d. Then how do we see 3D video on a 2D screen??

Well.. The basic requirement to see in 3d is to have two images one for each eye. To do this on a 2d screen, we may project a stereoscopic view( the image above is a stereo image) and separate each eyes view.

This sounds great, but doesn’t work in a movie theatre with many people.

To overcome this problem, we started overlapping the image. Ok, now how those two overlapped images are separated for each eye?

Here comes the Polarised glasses. Both the overlapped images on the screen are polarized in a different way, each lens on the glasses are used to match the respective polarization. There we go, we have one image for each eye. But if we look at the image without glasses, the image looks something like this;)


This is how we experience 3D:)



What’s a DSLR? And how to use it?

Before getting into the usage of a DSLR, let’s see what actually DSLR is and what it does?

In a DSLR (Digital Single Lens Reflex) image you see bounces up to the viewfinder. It passes through a focusing screen and a condenser lens, and then reflects off of a prism’s walls to reach your eye. This allows you to see exactly what the lens sees through the viewfinder. Have a look at the image below.


The main differences between a point shoot camera and a DSLR are , the DSLR will have much better photo quality and response, an ability to change lenses like telephoto lenses, wide-angles, fisheyes and many more.
Well… Now a days we even get to try these lenses as an attachment to our mobile phones too;). I have recently bought these lenses and these work amazing.


How to use a DSLR?

I know it’s actually more dumb to write about the usage of an instrument than to read..;) So here’s the video on how to use a DSLR..

The main basic and main functions of a DSLR on which it works are ISO, SHUTTER and APERTURE.

->”Shutter” speed is responsible for motion blur. This is often seen in many pictures of moving objects where the background goes blur.


->”ISO” is responsible for the sensitivity.


->”Aperture” is responsible for the depth of the field.


All these three functions are interrelated. Now let’s see all these functions on a DSLR.


Thanks for reading… So, let me know if this was useful.