Quote:
Originally Posted by Mokusatsu
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Proper collimation of binoculars requires proper binocular collimator's to do it correctly, with precise alignment. End of story!
Yes, it can be done without (by using the eye), but the real issue there is that if it isn't done correctly, your eyes will attempt to adjust for incorrect collimation, which you cannot see by eye, and thus cause eye strain.
Incorrect collimation is the main cause of eye strain when using binoculars.
Cheap binoculars usually go out of collimation quite easily due to the poor internal construction, which cannot resist knocks and drops. This is one of the main reasons why high quality binoculars are expensive, as they have better internal construction, as well as better optics. I have seen many many examples of poor collimation over the years, when people thought that they were aligned properly, but they weren't. It is costly getting a pair of bino's collimated, around $50, last time I looked.
But, it is all a trade-off, price vs quality. To get high quality optics and high quality construction cost much more. You simply cannot get both these attributes in a cheap pair of binoculars.
Cheers Peter