The second photo is after it has been properly collimated. The white cross hair sits perfectly in the middle of the black square and the resolution test chart numbers lined up - this is perfect collimation AND perfect diopter calibration.

Up down is not a problem because the reflected image is up just as you would expect it to be if the object was really opposite you.

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Believe it or not, binocular night vision housings come with optical pods that often do not line up perfectly. Collimation is the process of aligning the two independent optical axes of each pod so they both point exactly straight in three dimensional space. Why is this important? When using a pair of goggles that are not properly collimated, the human eye and brain tries to correct the misalignment by either crossing your eyes subconsciously, or your brain has to work harder to mentally align the two images. Over time this can become tiresome and can result in fast fatigue compared to a properly calibrated set of goggles.Pictured are some through-tube photos of a binocular device on our Hoffman collimation bridge. How the collimation bridge works is that the goggle sits on a very precise location on the Hoffman test set and two distinct reticles are presented to each optical pod (you can actually see what each reticle looks like in the first photo). Then the bridge is installed over top of the goggle in a precise location and prisms essentially merge the images together into one eyepiece. This is very difficult to achieve without a proper test set or a custom-built precision collimation rig.This device in the first photo was not assembled or calibrated by us and it looks like it was collimated using one of the DIY methods. The first photo is how it was received, notice that you are essentially seeing double. Your brain will naturally try to correct for this and cross your eyes. The problem is that while the misalignment is obvious looking at a two-dimensional photo on a screen, this is not obvious when looking through the goggle as your brain may naturally try to correct for this, and essentially make you cross-eyed.

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One might wonder why is it that when you see writing through a mirror that the writing is backwards, but not upside down.  Here we try to understand why it is we see objects in reflected from mirrors as we do.

The forefinger of my right hand is on the camera button that takes the photograph.  Notice that it is on your right.  Now if I was really facing you, i.e. not reflected from a mirror,  the forefinger on the button would be on your left side.  You might not like taking that on faith.

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by J Bomer · 2013 · Cited by 37 — Also, by use of electronic collimation, potentially important information may be lost. The silver lining, denoting the X-ray beam collimation ...

Since I am not standing on my head, my head is up and it appears so in the reflection from the mirror. Return to Physics of the Visual Stimulus

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To prove to yourself that this is true, stand in front of a mirror.  Now make a movement with your right hand, or wink your right eye.  Looking at yourself in the mirror, from your viewing perspective, was the image of the hand (or the eye) on the right or the left that moved?

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By the way, have you ever noticed that Ambulances use this illusion by writing the word "Ambulance" backwards on the front of their vehicle. They do this because when you see the vehicle through your rearview mirror the word Ambulance appears normal and then you are absolutely certain about what is behind you.

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The "mechanical" parts of the lamp are 3D printed, the electronic part is simple and the plastic optical fiber is eye catching. The shape of the lamp is ...

When one looks into a mirror it appears as if you are looking through it and seeing the object on the other side.  It also seems as if the object is flipped left to right. In reality the right half of the real object is on the same side as the right half of the virtual object.

What is collimation?You may have heard of this term somewhere in your search for night vision and possibly dismissed it as yet another night vision jargon but in fact, collimation has one of the most important roles to play in binocular night vision.

Let's define some terms.  By real object (image) I mean the object that is being reflected.  By virtual I mean the image or the reflection of the real object.   When you hold words in front of a mirror by standing behind the text (as I am, below) and look at its reflection, the right side of the reflected word will  be on your right side and will appear backwards. If  I was actually standing with the sign in front of you, the words, from my perspective, would read from right to left because I am behind the sign. They would read from left to right for you, as does this text on the video monitor.

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So, take a look at the writing across my sweatshirt.  Obviously it is backward.  It is not actually backwards on my sweatshirt.  But what seen reflected from the mirror it appears backwards.  The word "The" is on the right side of the sign, under my right hand.  If I was, in fact,  facing you, i.e., not reflected from a mirror,  the word "The" would be on your left side and you would be able to correctly read the words "The Joy of Visual Perception.

If there is an individual or company selling night vision but does not own a collimation rig, there is a high likelihood that collimation was not performed at all. This results in that is barely serviceable but far from perfect. Some may even try to convince you that proper calibration and collimation is not necessary. We demand perfection and so should our customers and the wider night vision community. Unfortunately without these tools or an in-house quality control process, there is no way to verify perfect collimation, calibrated diopter, amongst other things. All night vision is not built equally. Don't live with "good enough". Screen the retailers you are thinking of buying from and ask them about their build process and tools. Demand more.

NAR Murty · 2017 — We set out to characterize how viewpoint invariance in monkey inferior temporal (IT) neurons is influenced by two image manipulations-silhouetting and ...

If you are still doubtful as this explanation lets look at the following photo which I took of myself in front of a mirror.