bsiegler wrote in post #17914503
Hey Marty,
Hoping you have a trick or suggestion for making this easier. I struggle with achieving perfect exposure too. I understand the exposure triangle and I often reference a DOF calc, I know (or so I've read) that every time the f-stop value halves, the light-collecting area quadruples. Etc, etc. I've read until several things but it's still not an "automatic" trigger in my mind when I compose a shot as to what my settings should be. I have to take several shots, look at my histogram and etc. Usually by the time I've got my settings, the moment or shot has passed. What's the easiest way to know this stuff inside and out? Is it simply memorization or just practice or both?
Thanks,
Bill
Hey Bill,
With a newer camera with a ton of dynamic range and a large sensor, you don't have to be careful even, and that's the beauty of shooting with something like the D810 or 1DXII. However, for the rest of us mortals with humble cameras that are not quite there to those levels of range, we have to be careful and try to get exposure right.
What you're referring to, and what the OP stated, are very different things. The OP stated they tried to increase shutter speed, but got a darker image so they stopped. They means they didn't change ISO nor aperture, where possible, to compensate and maintain exposure. What you're stating is basically, how to get exposure right, and keep it right, without missing time. For the OP, he/she needs to learn how exposure works and that knowledge relative to how to stop motion and understanding time compared to motion. For you, you have the right idea, you just need to make it more simple. That, I can help with.
For you, what you're doing, shoot RAW first and foremost, as this allows you to recover from error which is inevitable and also gives you the best ability to process noise. I will assume you're shooting high ISO, but this info applies even if not. When you enter a gym like this, before the game's action starts, you should already have exposure figured out and done. And you shouldn't have to change it really, as the court is generally even lit, just not very bright to a camera, relative to the speed needed to stop motion. You do this by either chimping a shot and looking at the histogram, or by using Live View and looking at the histogram. And then whatever that exposure value is with your setup, you're going to probably want to expose a bit more to the right, so that there's more information on the right side of your histogram, while maintaining the shutter speed you need, but not pushed so far to the right that highlights clip. This gives you the most latitude to process, helps a lot with noise, and you can drop exposure in post without it hurting the quality of the image, compared to attempting to recover underexpose which will hurt the quality of the image with worse noise. Sometimes, you will not have any more room to increase exposure, so in that case, you attempt to get exposure as correct as possible. In this thread's spirit, assume again a gym, you simply set your shutter to what it needs to be to stop motion (because who cares about anything if you have a blurry junk shot right?), and that's 1/800s for most things, up to 1/1000s for tips of hands/feet, etc, to stop motion. Slower is only ok if they're walking or standing and not running/sprinting/bursting/swinging/throwing. So rule of thumb, you start with time (ie, shutter speed). From there, whatever aperture you can use for depth of field and light gobbling purposes, this is basically F2.8 on a zoom at best, or F1.8 or F2 on a common prime. After that you're left with ISO. To keep enough exposure, you will start around ISO 3200 and up to ISO 12,800 easily. Lower is better for noise, but a sharp frozen action photo with good composition and some grain is way better than a blurry photo, underexposure and poor composition and maybe less noise.
You shouldn't have to change your settings in the gym. You get exposure first. Shoot RAW. And you're basically done. Again, on lower model cameras, exposing to the right without clipping highlights will help with ISO noise and recovering shadows, etc. If you can't expose to the right, just expose as dead on as possible. If you have to compromise, you have to choose what's important: for basketball for me, I'd rather get a slightly underexposed image with frozen action and clean it up if I had to, than a blurry properly exposed image that I cannot fix with less noise. You may have to compromise some where if gear is a limit. But I can't stress enough that composition and capturing the moment is far more important, than having noise in an image or not.
So again, quick dirty way to do this relatively reliable (sports in a gym):
1. Manual mode. AI Servo. Continuous Drive. Shooting RAW.
2. Shutter speed based on stopping motion as needed. For running adults, this starts around 1/800s. Slower if walking or standing. Faster if trying to stop the end of a swinging objects or limb (this probably only will apply outside though).
3. Aperture wide open. If you're stopping down, you're in the sun at noon on a clear day. In a gym, you're wide open.
4. ISO to whatever it takes to get exposure correct, and if possible, slightly exposed to the right. This will easily start at ISO 3200, ISO 6400 and if need be, go to ISO 12,800 or higher if your camera can.
5. Meter the court and jersey's of the players. You want to ensure the whites are bright and white. It's the easiest thing to expose and check, get it right and you will have exposure for everything else.
6. Chimp a shot of a jersey that is white or has a lot of white. Look at histogram. Ensure no highlights are clipping. Push exposure to the right where possible. Or just get it correct. Expose again. Check histogram again.
7. Exposure shouldn't change enough for you to have to change values at this point unless some lights go out or suddenly turn on.
8. You're dialed in now. Focus on the game, you're set. You should be at the right locations for the action shots you want. Composition is more important than just having a snapshot. High FPS helps.
9. You have to know the game to know where the interesting action will be. So obviously get to know the game. Again, be where you need to be for the action compositions you want, and use high FPS.
10. You process the images from RAW, adjusting for highlights where necessary, etc, and noise processing comes first in the sequence before other things where possible.
Very best,