What is Bokeh?
So those of you that are listening at home again bows and bone k isn't kennel kettle so it's a japanese word that does mean blur again it's the visual quality of your blood not your black background blur itself and again quality can be measured I can't say that's one to ten scale like there's no definitive that's better than this this is better than that but ultimately moves photographers what they're looking for is circular blurry like blurred out dreamy ok and that's generally what people are looking for to achieve that isn't necessarily difficult we have to learn the complexities of the lenses and the lead choice that you're using so tactically speaking the on ly thing that controls the quality of booking is gonna be your lens has nothing to do with your camp and we'll discuss that a bit later why that's a miss misconception on again I spent the last three months during the research and broke itself and trying to understand is it really such a simple term that everybody understands ...
and I think by the end of this you realize how complex quality really iss so we discussed diaphragm blades you guys familiar with your aperture the size or aperture all those played a huge role just by the lens itself and how the lenses constructed so I get a chance to sit down with a couple of a couple different companies toe discuss how their lenses were manufactured I mean, we got into the field of that sounds weird the depth of field we got into in depth as much as the lens where the land is constructed, where the dia friendlies air constructive, how the diaphragm blades work and everything together in unison, and it can really get that complex again. It's physics and we'll talk about spherical aberration, aberration, such so first things first circular book in your book, it is controlled by your aperture amongst other things, we'll talk about that momentarily, but the shape of your book and is manipulated by the number of aperture relates that you have so lindsay's that have smaller apatow blades when they're closed out and something like three, five, five, six, you'll start to see that instead of getting circular ball caving to start to get a pentagon shape and the more diaphragm blades you have, the more circular your book is going to say, this is really simple concept. I mean, you guys can start to see the difference between five and six, and as it closed down my aperture and I make it to five let's, say, five, five f five, six or six, three or eight or eleven, I'm going to start to see a definitive shape and my ok, so those are things to consider as you guys were purchasing your lenses. You guys know it's write this down for now give you lower cheek she afterwards so I'm gonna take generalize linda's cannon nightgown in sigma most modern lenses come with nine different plates and I discussed the more diaphragm blades something has more circular book is gonna be so all across the board of an icon and signal unless you're purchasing a one point pete they're all gonna have nine die from blades cannon on the other hand for the fifty, eighty five, seventy, two hundred they have eight is it aesthetically different? You probably won't notice the difference unless you're gonna be a pixel skipper between eight and nine but you'll notice a definitive difference between nine and five so if you guys go purchase a fifteen hundred other lines or thousand dollars or nine hundred little ends, these are things that you consider so as you guys are making those purchases. If you look into the tech spec sheet of each lens, it'll say how many diaphragm blades it'll have and it will generally say for marketing purposes like the sigma is sold the thirty five it produces circular bo care because of the nine diaphragm blades and that's something that's marketed when they sell the product. One of my first lenses was the fifty millimeter one point eight and it's generally everyone's first lines because it's like one hundred bucks one hundred twenty bucks, seven different blades, okay and the reason that's produce and just to be open about it, we'll talk about that in a bit ultimately, companies you are not in the market for selling blurred photos this is a class and blurred photography, not focus photography lens companies don't want to sell you plans is they're going to blur at the end of the day because that's not their job, their job is to get everything and focus and get the picture of nice and crispy and clean. However conversely, there is a way to create blur because of what's in focus and we'll discuss steps, the field and how to calculate deaf to field and have moved up to field the shape of your blurred focus also has to do with sort of the shape of your amateur can also be impacted by your optical than getting and those of you that have no idea what I just said and it sounds like japanese and you don't speak japanese that's okay once a pressplay free the nipple movement here so let's walk up here so optical vignette what that means is the way the lenses manufactured the way the lens the way itself the khan cavor convex the lenses ultimately has an impact in your final photo not necessarily in your subject itself, but if you look at the book in the background, you notice that it has a slight roundness to it now I understand that that's a tree, a straight tree, but I'm focused on the subject and the background is nice and worked in turn, as my focal point, the center moves out, I'll have more distortion to my lens, I'll have more distortion towards that background of ok things were starting to get out of focus when it's wide open, we're going to have to we're going to start to see more just bubbled bubbled photo in the background and you can tell that even the bottom left hand corner telling it kind of sits circular on a person and that person's literally in front of a bunch of trees like branches and bushes. So most again, most manufacturers are just focused on image quality. They're not in the market presenting blurred lenses. I mean, that that's the total out of this thing a person selling a car but telling you to take mth, take take a bus or a subway like it doesn't make any sense now, the way that lenses in manufacturing because they're focused on keeping focused as funny as that sounds, uh, they get chromatic aberration, they get spherical aberration those of you that again, I sound japanese and you don't speak japanese, we'll talk about it this photo here by the end of this class you're going to start to see a difference in this photo aa lot of that book, there isn't really a lot of it's in post production it's fake they're certain parts of the image that ariel this certain parts that I enhanced and I put a layer over it just to put extra booking. I play a game with my team in new york I played game with all my photography fence friends, which is guest the light in new york city if you guys ever play that you look at a photo, you look a but so we're nerds when we look at ads and we look at billboards were trying to always guess how these things are producing how they created because for us it's it's a game it's a puzzle and you could do the same thing with this image once you learn how book a works, how did your lens works? Now I know by the end this class and you'll know that the bookie on the right doesn't match the book and left right it's on the same focal plane, but they don't match okay, so if it's at the same focal plane and again we'll discuss this momentarily, they should be the same shape and size or at least have the same direction as I mentioned before because of the way that we have this fear of black operation we have the the netting they should all form in the same process so I can sit there and dissect my own photo and realize that there was enhancement to this photo. Now we just discussed the book is not just getting things out of focus. This is how complex this convey and figuring this things out. So chromatic aberration. I don't even want to read that this is what this you ever looked at a photo and seeing those little tiny vignette ing right between certain points where it's just completely blurred out on the edges. It's just a fine grain around your image. That's what chromatic aberration is surely a bit of color to it. It is generally like purples, and we'll talk about what the actual purples are. But there's always these little markets, not sharp there's. Something wrong with it, it's a process and arrow with the lends itself has nothing to do with your camera and the way that the lenses contracted spherical aberration, for example. And this is why I'm saying this could be physics. He has ready. You're like, oh, god, I'm a physics lesson. Okay, easily, this is your lengths. This is your chance. This is light, this is liked, okay, light on the left, anything that's not corrected for spherical aberration your cameras all they do is absorb light to be able to hit the sense or make make a picture at the end of the day that's what we're all trying to do right? So anything that's not corrected for spirit collaboration anything that has distortion to it in regards to the the structure of the lens as it hits the center point for the actual focal plant able to produce the photo it's not heading out there all the same points you're going to start to see miscellaneous been getting we're going to start to see little errors around the image itself things can be changed because of process in manufacturing some people can cut corners and will ultimately get things like that versus things that air completely adjusted for spherical aberration hit a certain point it seems like a laser when the lasers precise and into the point we get a perfectly crisp image but if we don't have everything nice and focus and completely adjusted for aberration we get a very either soft photo or it's not perfectly attack sharpened focus what we get something that has a couple of color variations because at the end of the day we're photographers were captured in light right? We're not capturing anything aside from what's bouncing off of our subjects again those of you that see joan at shaped out of focus photos that's due to your spherical aberration the way that the light hits the lens and I could talk to you formulas and sit there and give you diagrams all day. But at the end of the day, if your book, it doesn't look like it's, soft and glowy and pretty and blurred, you're probably not adjusted for that spherical aberration, which means that your your lens is an intern for that, and a lot of older lenses, a lot of vintage lenses and in a lot of photographers up for going on ebay and purchasing lens for one hundred bucks, one hundred fifty bucks, they may have less aperture plates than we do now. They may not be constructed for spherical aberration. So we're going. You're going to see different boki that we would with normal blend, normal modern day lenses.