aceman215 wrote:
Hi. I’m looking for help. I’m new to photography. I have been watching a lot of YouTube videos and reading as much as I could on Exposure. I got a good camera but I’ve gone from all AUTO to Apiture priority mode. I understand how the ISO, apiture, and shutter speed all affect each other. Here’s my Problem. One video says not to shoot with iso over 1600. One says something like 3200. Then they say the shutter speed needs to be a certain speed to combat blur (and I do understand each part of the triangle) then someone else says don’t shoot with the apiture wide open, another says to shoot with it wide open. I’m so frickin lost. I’m going to London in a month and I’m trying to get my camera settings down before I go but I’m having a hard time. And yes I know there is no correct answer because every situation is different. I downloaded a “get out of auto” video course and I understand the concept but I’m still lost. Some of my questions are...how do I know where to set my apiture in low light? I get it that wide open will have a shallow depth of field but I’m shooting in churches and such. But in general how does one determine the correct setting? I’ve heard the sunny 16 rule and that’s great for sunny days but what about low light situations? Do I guess between 1.2 to 11 (if my glass opens that wide which I have one that does). And iso. I’m told to keep it low to avoid noise. Well last night I was taking pictures of my dog in low light and I had the apiture set at 35mm 1.2, shutter at 1/10 and iso was set to auto and it came in at 12,000(something) There was noise in the photo. Should I be letting the camera choose the iso or should I choose all three? I also know that I can look at the meter and adjust using one of the 3 to get it all in line but I have to say that it comes out close to what auto does! What am I doing wrong and where can I turn for good reliable help. Any advice would be greatly appreciated.
Thank you and sorry for the long post. I just want you to understand that I know something (not a total newbie) but can’t seem to put it all in practice.
Hi. I’m looking for help. I’m new to photography. ... (
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Buy Brian Peterson's book "Understanding Exposure".... read it, study it, learn it. Might be the best $15 you ever spend on your photography.
Basically, there are no hard and fast rules. I would immediately skip any video or forum response telling me to only use this ISO or that ISO, only shoot wide open or only stopped down or that certain shutter speeds are required. IMO, YouTube is a terrible place to try to learn photography. There's good info there... but there's also a lot of bad. Short videos simply can't give you the overall picture you need, but can be useful to learn specific tricks or techniques. Forums are a bit better, since there can be feedback and discussion.... but it's still pretty limited and hard to discuss a huge subject like "exposure" in forum posts. And you'll get a lot of other peoples' opinions, which may or may not apply to your and what you're trying to achieve.
Actually, there's a RANGE of available ISO, shutter speeds and aperture to serve a lot of different photographic purposes. There are even techniques to extend the ranges that are typically available in cameras and lenses, to be able to do even more extreme things with your photos.
It comes down to what COMBINATION of the three factors will give you a "correct" exposure with qualities you want to see in your image.
ISO is the sensitivity of your image sensor. Use low ISO settings when they suffice, to minimize noise in images. But use higher ones when necessary to be able to use smaller apertures and/or faster shutter speeds.
A faster shutter speed is used to freeze movement, while a slower one can be used to deliberately capture some motion blur effects in an image. (Shutter speeds are generally stated in fractions of a second such as 1/500 or 1/1000.... but also in full seconds or even minutes in the most extreme. Typical camera today covers a range from 30 seconds to 1/4000 or 1/8000, on it's own.)
Aperture size determines depth of field... a large one (low number such as f/1.4 or f/2) renders shallow DoF with stronger background (and foreground) blur, while a smaller aperture (larger number such as f/11, f/16) can be used to render extensive DoF with sharp focus from near to far. (Note: "f-stops" are actually a fraction... "focal length divided by number".... which is why smaller numbers = a larger diameter opening and larger numbers = a smaller one.)
All three.... ISO, shutter speed and aperture.... can be adjusted in "full stops" to double or halve. For example, ISO 200 is twice as sensitive as ISO 100. Or, ISO 800 is half as sensitive as ISO 1600. A shutter speed of 1/500 is half as long as 1/250, allowing twice as much light to pass. Aperture f-stops tend to be the most confusing.... but suffice to say with each full stop there is half as much light being admitted through the lens. Full aperture stops are f/1.0 (100% of light passes), f/1.4 (50%), f/2.0 (25%), f/2.8 (12.5%), f/4, f/5.6, f/8, f/11, f/16, etc.
When you want to use a lower ISO for some reason, to still have a correct exposure you either have to slow the shutter or increase the size of the aperture... or a little of both. Same with aperture... if you want to use a larger one to render shallower depth of field, you'll need to increase shutter speed or decrease ISO, or a little of both. Or if you want to use a faster shutter speed to better freeze the movement of an active subject, you'll need to use a larger aperture and/or higher ISO to compensate.
Fortunately or unfortunately, many cameras allow even finer control over all of these factors... Sometimes optionally, sometimes not... many or most offer half or even 1/3 stop increments in-between the full stops mentioned above.
None of these settings is "right" all the time. You... the photographer... get to choose among them, deciding how you want the camera and lens to render the image.
You do need to select a combination of ISO, shutter speed and aperture that will make for a "correct" exposure. But what's "correct" is also a variable... "high key" photos are deliberately somewhat overexposed..... while "low key", silhouette and some other techniques may be deliberately underexposed to some extent.
Experiment and give yourself some time to learn the different ways an image can look and the controls provided for you to be able to achieve the different renditions. Peterson's book has a lot more detail and info than is possible here on a forum. So get it, read it, study it, learn it! Then get out and shoot, review your images and think about what you like and what you don't, as well as how you might achieve whatever changes you'd like to see. Don't get too hung up on what other people say is "right" or "wrong". Develop your own ideas about that... your own photographic style. A lot will depend upon what subjects you like to shoot... And then upon how you want to see them rendered in your images. That will determine the correct settings for YOU to use.
Your camera might have some built-in assistance as you learn to use these. I don't know about other brands, but many Canon have a "CA" or "creative auto" setting that provides "wizards" with advice on the rear LCD screen to help you choose settings that will render the image as you'd like to see it. This is a bit slower in use, of course, as you consult the info provided and make decisions effecting your images. But it can be helpful while you learn to utilize the three different exposure ranges to make the camera and lens do what you want it to do.
EDIT: And, yes, there are various auto exposure modes... each serving its own purpose. These can help you as you learn, too. Some will continue to be helpful or even necessary in the future when you have a better understanding and control. "P" or "program" mode lets you choose the ISO but leaves it to the camera to decide both aperture and shutter speed that it "thinks" will render a correct exposure. "A" or "Av" is "aperture priority" where you decide the aperture and ISO, and the camera adjusts the shutter speed to achieve a correct exposure. "S" or "Tv" ("time value") is "shutter priority", where you select the ISO and shutter speed, but leave it to the camera to decide an appropriate aperture.
More recent digital cameras also have Auto ISO which is best used with M (manual), to provide yet another form of auto exposure where you decide the shutter speed AND the aperture size, but leave it to the camera to set the ISO. I would NOT recommend EVER using Auto ISO along with P, Av or Tv AE modes.... because that becomes a somewhat unpredictable "auto-auto" mode that serves no real purpose.
If you just don't care or don't know what to do, simply use the "point n shoot, super auto" mode that most cameras offer ("A+, green box" on Canon, "Auto, red box" on Nikon, etc.) That's like using a camera phone (so why bother buying a DSLR at all?).
The problem with any and all super auto modes (besides "A+" and "Auto", many cameras also have "scene modes" such as "sports", "scenic", "portrait", etc.) is that they automate and dictate what you can use in many other ways, besides just auto exposure. They will limit how you autofocus, image characteristics such as contrast and color saturation, frame rates, metering methods, whether or not the flash will fire.... Even the type of file you're able to save. Many of those are things you should be deciding for yourself. But these super auto modes (especially the most basic) might serve occasionally while you learn to use the others, when you just aren't sure what to do.
But the more control you take over it, the better your results will be in the future. Personally I avoid the "scene modes" and "point n shoot" mode.... But I do use the auto exposure modes: Av, Tv.... and occasionally P or M+Auto ISO. I prefer to use fully manual exposure.... "M"
without Auto ISO... to "lock in" my exposures whenever I can. But that's simply not always possible. When you're shooting in variable lighting conditions.... or a subject that's moving in and out of different lighting conditions... it can be essential to use one of the AE modes. M just won't do (despite some people who will tell you that's the ONLY mode to use). IMO, it's important to learn to use M, Av and Tv in particular.... P and M+Auto ISO also can be helpful at times, too. But, as far as I'm concerned the other more highly automated settings many cameras have just make for unnecessary, added confusion and/or overly subvert the photographer's control over their images.