Guide To The Micro Lens Adjustment
The latest generations of Nikon and Canon (as well as other prominent manufacturers) allow you to refine the focus (adjusting) lens acting on some parameters accessible through the software on board cameras themselves, to save these changes and recall whenever it mounts the object settings. Some models are able to automatically retrieve the file adjustments recognizing the lens and others (such as the flagships of the two houses above) are able to recognize the presence of any multipliers focal making our job of micro adjustment very simple.
And it is precisely micro adjustment of the lenses that we talk about in this article as many photographers do not know they can change some parameters in order to improve the quality and usability of their cameras http://akusaraprosound.com . Obviously a micro calibration is possible if the lens deviates “a little” benchmarks: if the deviation is greater than you can not do is pack up the lens and send it back to the parent.
What is meant by micro-calibration and what applies
If the lens and auto focus camera are perfectly matched to each other, we will have a focus of our subject perfectly. If the point of focus falls slightly in front of the subject we will have a problem of front focusing. Conversely, if the point of focus falls behind our subject we will have a problem of back focusing. Both errors Focusing may not be immediately obvious but make our smooth images.
Wonder why a manufacturer marketing a target suffers from a problem of front or back focusing is a question much rhetoric: all lenses are produced for a range of tolerance. If we are unlucky, we could get hold of a goal that is at the limit of its maximum positive tolerance. If our camera is affected by the same problem (that is at its maximum positive tolerance), the combination of SLR and lens will be very detrimental to a phenomenon of front focusing very clear and well away from specific expectations.
To summarize clearly the problem, suppose you have a camera that is the limit of its tolerance and that has a value of +10 compared to the ideal situation. If our goal was an error of -10 than ideal, then the pair SLR-lens will behave in ideal conditions because the two errors are neutralized. But if our goal is +10 compared to the ideal value, then the couple will have a reflex target deviation of +20 compared to the ideal, equal to twice the maximum permissible value. Since this type of error is not covered by the producers (they are, after all, bad luck), the same producers han decided to help those who are in possession of a couple in their SLR imperfect introducing the possibility of micro-adjustments.