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now it used to be that back in the time of the dinosaurs when a person set out

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to take a photograph specifically a not blurry one they would actually have to

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send their assistant out with one end of a measuring rope and then adjust their

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accordion lens to the proper focal distance I mean okay that's a bit of an

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exaggeration but I think you guys get it what I'm driving at here autofocus

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Optical systems like all things photography related are complex and lead

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to the necessity of many highly priced peripherals and accessories or to put it

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a gentler way there are many types of autofocus systems which can be employed

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depending on the necessity or manufacturer specifications thankfully

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these multiple types can be broken down into two very simple camps active and

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passive passive systems come in several different forms but all operate by

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analyzing an image once it has been projected onto one or more sensors then

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adjusting the focus based on the qualities which help it to determine

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subject distance or Clarity since they only respond after an image has already

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been captured and then make adjustments without using environmental data all

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processes they enact are considered passive they are mostly found in two

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basic varieties which are referred to as phase or contrast detection phase

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detection can be found commonly in DSLR style cameras and works by using an item

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called a beam splitter to direct the light from an incoming Source onto two

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separate micro sensors which are placed on opposing sides of the lens

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effectively doubling the image doubling the image doubling the image in older

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cameras the user would manually have to adjust the focus until both images came

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in line but today software is utilized that matches up light intensity patterns

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based on Peaks and valleys allowing it to make a determination about whether

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the subject is back or out in front of

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proper Focus now while phase detection works well on high quality cameras with

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interchangeable lenses the added cost and bulk that accompanies it does not

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always make it a feasible option which by contrast brings us to well contrast

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detection that is at least this form of focusing works by analyzing the pixel

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intensity of an image on the sensor automatically adjusting slightly past

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the point of highest contrast and then back again this is what causes that

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quick blur effect that you might have seen on your viewfinder before snapping

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a shot but lonus I thought you said that there were two different camps of

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autofocus what about that that active thing you mentioned before well yes I

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did say that but in reality it was actually a bit of a tease since

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applications of active autofocusing tend to be on the less than practical side so

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far these devices work in theory by

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physically measuring the distance between it and the subject and operate

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outside the normal functions of the optic system so two implementations of

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this focusing style have been seen so far sonar which uses audible clicks to

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determine the distance to the subject yes just like dolphins do or infrared

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lasers like the one found on the LG G3 smartphone these use a constantly

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measured distance to triangulate the space between the subject in the camera

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and adjust the focus quickly on demand these systems have uh you know some

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failings though such as you know functionality ones like the inability to

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work when shooting something underwater or through a window and more mundane

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ones as well like the annoyance of having your camera click every time you

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take a picture while active Focus can still be considered in the EXP

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experimental stage it seems for the most part the verdict is still out so whether

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you're shooting you know 4K footage of your self performing reviews of latest

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computer components or taking pictures of someone pushing a hoop down a dirt

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road with a stick autofocus has what it takes to keep you in the clear speaking

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of annoying clicks if you're just finding your current job is not clicking

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to they also have photography courses I mean if you're watching this video who

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knows you might have a somewhat of an interest in photography and Photoshop

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all their courses are taught by industry experts with new courses added every

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week so whether you're setting you know you know new goals for yourself to just

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you know improve for the sake of you know tying that measuring tape around

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your bicep and seeing a bigger number okay they don't necessarily have courses

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on linda.com for that but the point is if you're just trying to improve

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