f1.8 vs f1.2 is one full stop. Here's what you need to know ✨Lightroom Presets: bit.ly/3TDLKMx 📧 LET'S CONNECT: gugliotta.one/... #photography #phototips
Bit of a correction. The f-stop is not the physical size of the aperture, but the size of the entrance pupil, which is the apparent size of the aperture when viewed through the front of the lens.
@@johndododoe1411 yes, the f-stop is the ratio between the focal length and the apparent size of the entrance pupil when viewed through the front of the lens.
Each stop doubles the area, so two stops double the diameter and thus the number . One stop is thus square root of 2 bigger . Hence the list 1, 1.4, 2, 2.8, 4, 5.6, 8, 11, 16, 22, 32 .
@@reneeschke The iris covers the lens opening to reduce the amount of light that reaches the center . Lena manufacturers place the iris at a position where doing so has the traditional effect . The iris stop is the focal length divided by the hole diameter . So at F5.6, the hole leftover in a 56mm lens is 10mm in diameter . In a 280mm telephoto lens, F5.6 would open the iris to 50mm wide .
@@reneeschkeArea = (Diameter²)*π/4, which can be rearranged to Diameter = √(Area*4/π), meaning when you ×2 the Area (the goal of f-stops) then you only ×√2 the Diameter, so although the Area doubles per stop, the f-stop (based on the diameter of the iris(?)) only increases at the rate of the multiplicative half, which is √2.
To be more precise, the number represents the size of 'entrance pupil' diameter, not the actual aperture size. Entrance pupil is the aperture when viewed from the front of the lens, which is different than the actual size of the aperture. This is the easiest to visualize in variable aperture zooms. When we zoom in, the aperture from the back doesn't actually change size, but when viewed from the front the entrance pupil looks like it become smaller because the optics moved, thus we have larger aperture number (smaller aperture).
Not to be a dh but there’s other people on this platform that have made videos about this. Anthony’s video is serving as a intro and hopefully this inspires you to go do more research 😁
I recommend reading about this sorta thing. Not just on forums. And if you want a video, then there are existing ones. I’m sure if you search ‘f stop explained’ you’ll get heaps of videos or ‘lens aperture explained photography’
There's a in-depth course called lectures in digital photography by Marc Levoy here in RU-vid. There's more in-depth explanations about these things in there. Check it out if you have the time and dedication
This guy is a legend. All this knowledge has leveled up my gear choices and general knowledge on camera bodies and the gears that works best for me, not every gear you recommend was for me, but there are some like the prograde card and the Rode wireless pro, then the knowledge on how to use ND filter and CPL filters. I just want to say a big thank you.
Insightful. Now what does a smaller aperture provide to a photo versus a larger aperture-50mm vs. 25mm (f/2)? Does it mean like letting in more or less light into photo?, Things like wider means more picture versus less opening of the lens?
@@elestudiodebuenavista628If you want to run a photography business, most of the time will not be spent on photographing people. It’s mostly paper work, networking, editing, etc. Making that art really needs to be a passion for you if you want to be successful.
@@Boris-dq3ub you probably already know this but generally gross profits will be relatively high and net profits low. The margin can vary based on experience, equipment costs, location, business expenses, business efficiency, etc. 🧸🧃
I thought that was a fixed aperture. I get the same amount of light no matter if I'm on 180 mm or 70 mm in my lens. And I only get the same amount of light with the same size of the aperture opening open? Or am I completely wrong? But that would mean that I need to fill in 180 or 70 for the f and that gives me different results of course when using the same aperture. So now I'm completely confused
The highest iso I pretty much ever shoot at is iso 800 on my canon 70d Any higher and the noise starts to impact image quality more than I’d like due to the old and apsc sized sensor
I trained under a master photographer 30 years ago. I used to teach post-grad photography a long time back. You are the first person, apart from myself, who I have ever seen explain the incredibly basic mathematics of how the F-stops are just related to the diameter and surface area of the diaphragm. So simple, so useful to know, so neglected. Now, do you know why we had 8 bit colour channels? I’ll give you a clue. Humans can typically perceive 255 shades of grey between black and white. ;-)
Is the ratio between the actual aperture opening and the diameter of the field lens behind the aperture opening. Unlike most people, I came to photography from astronomy. In astronomy, what is referred to as aperture in photography is referred to as focal ratio - which should be the term used.
I watch this dudes shorts solely out of anger. 😂 who is his target?? AFAICT its for people who can buy the higher end consumer level gear but have very little actual know-how and need the most basic photographic factoids.
I didn’t know this 😅 but this does raise a question. If I wanted a 24mm with a 0.95 aperture. It’s just over a 21mm circumference. But 20mm f1.4 lenses are pretty huge. Do you think you can explain why these lenses have to actually be larger then with the formula suggests?
It's not the actual physical size of the actual physical aperture, it's the size that it appears to be when looking through the lens (which is a fucky concept to get you head around, but I think Gerald Undone has a good video about it). The smaller the focal length, the smaller the aperture appears to be when looking through the lens, so for f/0.95 @ 24mm, you would require a ludicrously large aperture if you wanted to cover full frame. f.95 lenses that wide do exist, but they're designed to cover m43 sensors.
The F-stop influences the exposure (roughly, brightness) and something called "Depth of Field" which is the range in which images are in focus. If you get too near or too far away, objects will seem fuzzy.
@@therealbilaal8758 The depth of field for an 85mm lens at f/2.8 is different from the depth of field for a 35mm at f/2.8. I agree that knowing *only* the exact mm opening would not be of much use, in that you have to know *all 3* of the focal length and the f stop and the distance to the subject to determine the depth of field. (If you know the both focal length and the aperture in mm, that's equivalent to knowing the focal length and the f stop).
its how open the front of the lens is, therefore how much light gets into the lens. but opening it more causes more of it to be out of focus, refered to as bokeh. if you open the lens to 1.8 the separation of the subject from the background will be more pronounced, and inversely if you step down to say f32 you will have the subject and the background in focus, but you will need to compensate for the lost light in other ways.
T-stops is more accurate for light gathering (in the center, it doesn't account for vignetting) but f-stops are the actual size of the entrance pupil. So two 50mm f1.4 lenses should have the same amount of background blur and the same depth to their field of focus, even if they transmit different amounts of light.
@@nedkelly2035 I realized I kinda forgot my point. Stills lenses will probably never use t-stops because it's not accurate for the look of the image. F-stops tell you how the image will look whereas t-stops are a technical exposure measurement.
So 50mm is the focal length...that means 50 mm is the focus distance where when an object is sharp beacuse the light rays converge at 50mm from focal plane of lens. So if f2 means 50/2 =25... then the aperture becomes double the 50 then light rays converge more nearer to focal plane that is 25mm.....is this correct?
+1 stop means 2x more light. Typical stop numbers are 1, 1.4, 2, 2.8, 4, 5.6, 8, and so on. Each one of those gaps is a "stop" different. Half of them are fractions because we're dealing with light as a 2d image, so opening the aperture 1.4 times more results in 1.4^2 (~2x) more light.
