Wow, wouldn't you think I'd know this by now? Here is my question and as silly as it might seem, I didn't know the answer.
I was talking with some folks the other day about the different mode settings on their camera's, and one of them asked me this question:
When shooting in aperture priority mode, the camera automatically selects the shutter speed, we know that much. But do you have to then every time you want to take a picture, check to make sure the in camera meter is not showing a slow shutter speed, risking the chance of camera shake? And even though in the camera itself, you have the iso sensitivity set to on, and the the minimum shutter speed is preset to 1/60, the camera still sometimes shows the shutter speed going down below that,,,Isn't that what that setting is for? I didn't know how to answer that...Can someone explain, please?
Yes, Darlene, you should check that the shutter speed suits your requirements. If you're shooting with flash, or a static subject on a tripod, maybe the shutter speed doesn't matter much.
When Auto ISO gets to the maximum ISO you've allowed it to use, the shutter speed will slow down to give a correct exposure. Auto ISO tries to keep the shutter speed above the minimum you've set, but when the ISO gets to the maximum, it slows the shutter speed.
Darlene I use aperture priority mode probably 95% of the time. I also never use auto ISO. When in this mode you must pay attention to the aperture, for best lens performance or desired DOF and for shutter speed to eliminate photos with camera shake. You also need to set the ISO to a point which allows you to meet these requirements. All three of these parameters are visible in the viewfinder. As you become more experienced you'll find these settings almost become second in nature.
As far as your auto ISO settings go, once you hit the top ISO setting, the shutter speed will dip below the minimum you set just to insure you can take the photo at all.
Well that's kind of crappy,,,it seems to make no sense than to even set the shutter speed if the camera then goes below it.......I usually just shoot in manual, but was getting lazy and thought I'd go with either the shutter or aperture priority, but now I don't know...hey thanks for the quick replies.
Don't blame the camera. It means the ISO is set too low or the aperture is stopped down too far for the ambient light to allow a faster shutter speed. Manual mode won't change anything. You either need to use a tripod or add some external lighting.
You have to watch your shutter speed when using manual, too, so there is no difference. Shooting aperture priority is a lot quicker and I use it most of the time. I don't think auto-ISO is something to be used all the time. In instances where you need to shoot rapidly in changing light and need to maintain a certain aperture or shutter speed, it works well. However, when you set limits, there are occasions when the camera has to change something or give you the wrong exposure.
>>and the the minimum shutter speed is preset to 1/60
This preset shutter speed is only as it pertains to ISO. If you have the preset to 1/60, it will not let the shutter speed drop below that as long as it can increase the ISO to get the proper exposure. Once the ISO gets to the maximum setting, the shutter speed will drop below 1/60 to give the proper exposure.
You can solve all of this by using a tripod. IMO, there is nothing that will improve your photography quicker, than the proper use of a quality tripod and head. It is also very relaxing.
Jerry Jaynes Great Smoky Mountains of North Carolina
Thanks Jerry, yes, I totally agree about the tripod,,,I finally broke down and got a ball head and have never regretted it...I used to have one of those pan heads and after sitting in a tent and trying to be ever so quiet, then to try and ever so quietly turn the camera to one side or the other and hearing a ekk ekk ekk and watching my little birds fly off, I thought it was time to kick it up a notch.