Gadgetory

now it used to be the back in the time of the dinosaurs when a person set out to take a photograph specifically a not blurry one they would actually have to send their assistant out with one end of a measuring rope and then adjust their accordian lens to the proper focal distance I mean okay that's a bit of an exaggeration but I think you guys get it what I'm driving at here autofocus optical systems like all things photography related our complex and lead to the necessity of many highly praised peripherals and accessories or to put it a gentler way there are many types of autofocus systems which can be employed depending on the necessity or manufacturer specifications thankfully these multiple types can be broken down into two very simple camps active and passive passive systems come in several different forms but all operate by analyzing an image once it has been projected onto one or more sensors then adjusting the focus based on the qualities which help it to determine subject distance or clarity since they only respond after an image has already been captured and then make adjustments without using environmental data all processes they enact are considered passive they are mostly found in two basic varieties which are referred to as phase or contrast detection phase detection can be found commonly in DSLR style cameras and works by using an item called a beam splitter to direct the light from an incoming source onto two separate micro sensors which are placed on opposing sides of the lens effectively doubling the image doubling the image doubling image in older cameras the user would manually have to adjust the focus until both images came in line but today software is utilized that matches up light intensity patterns based on peaks and valleys allowing it to make a determination about whether the subject is back or out in front of proper focus now while phase detection works well on high quality cameras with interchangeable lenses the added cost and bulk that accompanies it does not always make it a feasible option which by contrast brings us to well contrast detection that is at least this form of focusing works by analyzing the pixel intensity of an image on the sensor automatically adjusting slightly past the point of highest contrast and then back again this is what causes that quick blur effect that you might have seen on your viewfinder before snapping a shot but Linus I thought you said that there were two different camps of autofocus what about that that active thing you mentioned before well yes I did say that but in reality it was actually a bit of a tease since applications of active auto focusing tend to be on the less than practical side so far these devices work in theory by physically measuring the distance between it and the subject and operate outside the normal functions of the optics system so two implementations of this focusing style have been seen so far sonar which uses audible clicks to determine the distance to the subject yes just like dolphins do or infrared lasers like the one found on the LG g3 smartphone these use a constantly measured distance to triangulate the space between the subject and the camera adjust to focus quickly on demand these systems have you know some failings though such as you know functionality ones like the inability to work when shooting something underwater or through a window and more mundane ones as well like the annoyance of having your camera click every time you take a picture while active focus can still be considered in the experimental stage it seems for the most part the verdict is still out so whether you're shooting you know 4k footage of yourself performing reviews of the latest computer components are taking pictures of someone pushing a hoop down a dirt road with a stick autofocus has what it takes to keep you in the clear speaking of annoying clicks if you're just finding your current job is not clicking for you and you want to keep your future 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