now it used to be that 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
accordion 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 are complex and lead
to the necessity of many highly priced 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 the 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 lonus 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 autofocusing 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 optic 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 in the camera
and adjust the focus quickly on demand these systems have uh 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 EXP
experimental stage it seems for the most part the verdict is still out so whether
you're shooting you know 4K footage of your self performing reviews of latest
computer components or 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
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