The Art of Photography :: The Camera Obscura

The Art of Photography :: The Camera Obscura


got god kid totally out of the tire fee minus ten
forms and today we’re going to talk about the camera obscura figure this was
a good subject to kick off her very first podcast with loud since the
clarence care really predates what we consider to be the origins of
photography and would show you a camera scary is we think of the invention of
photography we really think back like the eighteen hundred’s when guys like
Fox Talbot but we’re experimenting with early image recording but actually it’s not
really the birth of photography what that is that’s the birth of but being able to record an image
onto animals have been either sits on a piece of glass or piece of paper to record that still but actually photography based date
swayed back earlier than that with things like the camera scarab in fact
there are no read record of people like you know greeks like aristotle on the
fourth century discussing leonardo then she discusses the cameras
carrasco codecs black ice and especially during the renaissance there are some
contested theories that that some portrait painters like people a premier
where using kind of these light rooms to actually going to trace the image that
explained we do know that there were experience
with optics going on at that time and that would explain some of the uh… the great contrast in realistic detail from dot artwork that was produced
before the renaissance but either way and show you what a
camera obscura is and how it works because i think it really is the most
basic you know this is how photography works and how images are captured ok for
this experiment and i promise i won’t turn into mister science on every
episode but we’re going to do and you can try this at home it’s pretty cool
you can take just a standard cardboard box okay got a cardboard box cut a hole in it
right here capt so we’re going to do is a menu take
simple camera lens were asleep in their home and what i want to do this project an
image or project light onto the back of the box zalman india i’ve got a light
bulb over here in this is actually this kind of weird like miseries muchos it if you do this at home most light bulbs
that should buy that the hardware store come with a white coating on it and it’s
hard to see detail through the white coating i think this example because it’s a
clear glass bowl than you can see the filament inside unanimously that the
second but it’s pretty easy basically what
happens has worked on this on i am actually using and i’ve got some
light going here i’m going to put the lens on the front
of the box and we’re going to simply hold it up and you can see that the
image of the lightbulb is projected you can see some detail of the of the stuff around the light bulb in
the south in this particular light projecting onto the back of the box pre-civil you might also is harder to
tell here ’cause this is an conventional but he’s a standard light bulb you can
see at the images actually projecting upside down okay nam explain and then we talk about
uh… pin holes but ob essentially there are three ways that you can manipulate
light account the first ones reflection the second one
is projection in the third one is refraction reflections pretty easy to see every
morning when you have to look in the mir amir’s simply a way of reflecting its an
optical aleutian where you have eighty a smooth enough surface that’s that’s been
optimized to have the softball lucien where you don’t see the glass
surface you see this artificial world beyond that which
is the exact mirror opposite of what you’re world is that you’re looking
inching obviously in venezuela maria’s the other two ways of manipulating
lights well-reasoned right here’s refraction
were using blasts to manipulate the light to project the
image onto the back of the box now you can also use the
third type of manipulation which is simply projection organ of the other thing i’ve done this
box other than cut a hole in the front is of actually taking a a their small
pandian literally made in ten hole right here on the front of the boxes you can
see it’s really tiny camp two small panel okay now will reduce to the same
experiment now obviously the lens had opm was able to let more light and this is
called aperture if you’re not sure what that is will talk about it but surely but anyway basically this is
a smaller hole sits letting less light and that you can still see actually if i put this in front of the light that
we can see the white referrer projected in this
case through the panel onto the back of the box with some detail you don’t necessarily need a lens to
produce an image who show you one other thing we’re taking a step further i’ve
got a uh… just a regular white mailing envelope put this in here and cns effects but as you can see the snap projecting
onto the white envelope the closer i move this white envelope
towards the pinhole the smaller the image gets it stays on
that stays in focus because we have such a small aperture but you concede that the the image
actually smaller the closer yet and for the way i move the bigger the image gets this is what’s
known bosom girls as focal length ok now lenses on standard cameras come info collects okay so if you have
the small the shorter the focal length the wider the angle you’re going to
happen and explain its works because it’s kind of the opposite of the way
things appear in real life the clothes or something is the bigger debts right see office into the panel or through the lens to but what they
want to really close uses really small some more of the scene is going to be
projected onto whatever you’re projecting onto it be ok film this envelope for a cc bcc the a digital
camera anywhere anymore the scene on there the further back i go over the longer
the focal length high end up with kind of a macro or telephoto effect so that our focal length works so essentially that is the camera msc
europe and we did with two two methods here we use refraction to project relied
on the back alleys priest and a projection to project light on the back in both cases that image was upside down
and we know that because lights we know travels in a straight line so
for instance the top of the light bulb come down to go into the painful the
bottom of the light bulb has to come up to go through the panel so if you continue up with that line
once it hits comes through the pen hone hits the back of the projection surface
in this case it would be on the top and not the
bottom and vice versa for the top so that’s why you end up with a completely
are kind of inverted image if you will when
you look through here so is this how that works in the next up
so we’re going to talk about pinhole photography which really i get excited
about because panel photography is one of the most kind of early examples of uh… of photography does require lens is very
low five it’s really interesting facts with
images and it’s very inexpensive and easy to do you can make your own cameras
even say within the next time but uh…
that’s all i got three days thanks for watching poo god

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