What Is Iso And Aperture Priority

Do you prefer shooting in aperture priority or manual?

I always preferred aperture priority, for the simple reason that, in most cases, it’s practically the same as manually setting shutter speed and aperture. When you change aperture, the shutter speed changes. So you control both by changing one of them. Of course, I often use exposure compensation - which is ALMOST like using manual control, I admit. But for me, it’s just more convenient.For me aperture control is more convenient because by setting aperture I choose the depth of field of my images (and also, with prime lenses, I can choose if I am ready for a bit less sharp image when I push the lens wide open). Since my shooting does not include much live action (sports, wildlife) I then only need to MONITOR the shutter speed that will be automatically set by the camera in aperture priority mode. If I don’t like the resulting shutter speed (too long for what I’m shooting) - well, I just change the aperture and that’s it.If I would be shooting sports, I would probably be in shutter priority.There’s another thing that needs to be taken into account with modern digital camera - which is sensitivity setting. If you’re on manual, you probably manually control not just the shutter and aperture, but ISO as well. If you’re on aperture priority, you may or may not want to / need to control sensitivity. If you need to control ISO manually (which in real life is often the case), then I guess aperture priority with manually controlling ISO and exposure compensation is almost the same thing as going “fully manual”.Assuming, of course, you ARE using in-camera exposure metering.

What are aperture and shutter priority modes?

To get a correct exposure of a scene, light coming in has to be controlled. Too much light results in a over exposure (too bright) while less light results in under exposure (too dark). Light hitting the sensor can be controlled in two ways. The first being the opening in the lens called aperture, the second being how long the shutter is open to allow light hitting the sensor.Control is of 3 types: Manual, semi-automatic and full automatic.Aperture priority indicates the semi-automatic control mode, in which photographer controls how much the aperture will be and shutter speed is adjusted by the camera automatically to get correct exposure. Here there is a combination of manual and automatic control. Aperture priority is used in portraits and landscapes to control depth of field which is to control how much of the scene is sharp or blurred out.Similarly in shutter priority, photographer decides the shutter speed and camera automatically adjust aperture. This mode is used when you want to show motion blur or freeze fast moving subjects.

Why is my camera shutter speed so slow in aperture priority mode in 18-55mm kit lens?

Everybody has identified it. It is not the lens. It is simply the set top in the camera which you can re configure. Most cameras in Aperture priority, which you should set to f/5.6 in lower light, heck even in daylight unless you have a reason for a smaller f/stop. Go into menu and in auto ISO, set it to range in a broad band of possibilities. Usually, and I do not know your camera, you can also set a “do not go lower shutter speed than…” However if the light is really low, and the ISO cannot compensate, the camera won’t fire either because you have set so many parameters not to have a lower shutter speed.But this sounds like an ISO setting problem. Auto ISO will usually cover most of the problems.It has nothing to do with the lens, except it is a relatively slow lens. But that is not the problem. It is your combination of f/stop and ISO choice is forcing the camera shutter speed to open for longer periods of time.If you still have problems, be very specific and we can help.

Which camera mode (Manual, Aperture or Shutter priority) is best while photographing birds when the bird is constantly moving around?

For keeping a moving bird into sharp focus you need to do the following:Use AI-servo mode (Canon) or AF-C (Nikon) or similar modes in other brands. This mode keeps your moving subject (bird) into constant focus.Select the center focus point (preferably in a group with surrounding AF sensors).Use back-button focusing instead of the shutter button. This is extremely critical and 90% of photographer does not know what a back button focusing is all about. Google for the resource, there are enough of info in web. Keep the back-button pressed while the bird moves.Use Manual mode with auto ISO. you can keep a precise control over the aperture and shutter speed both - while the auto ISO will keep your frame perfectly exposed. Use higher shutter speed for fast moving birds or birds in flight.

Why don't cameras have an ISO priority mode like they have shutter priority and aperture priority mode?

The idea of shutter speed or aperture “priority” is simply partial rather than complete automation. In shutter speed priority mode, I manually set the shutter speed and the camera sets the aperture. In aperture priority mode, I manually set the aperture and the camera sets the shutter speed. So clearly, all ISO priority mode means is that I manually set the ISO.Realizing that, it should be clear that all cameras have “ISO priority” mode. They always have. I get to set the ISO specifically, rather than have the camera determine it. Even film cameras. Back in the days of film, that’s basically all you had — the film came fixed at ISO400 or whatever, and that was what you shot with.Now of course, in the modern era, we can automate any or all sides of the exposure triangle, right. The new thing is the ability to have the camera pick my ISO as well.Early digital cameras grew out of latter-day film cameras. They offered adjustable ISO, but they didn’t change any more of the camera interface than necessary. After all, the whole point in labelling it “ISO” rather than “gain” as it had been on camcorders was to make the move to digital an easy transition for film photographers.So digital cameras had the same PASM dial you had on film cameras (this one obviously from a consumer model). So now, years after these early digital cameras, we get the ability to automate ISO as well. How do you fit that onto this dial? I could rightly want automatic ISO on or off for any of the other settings on that dial — no reason to automate just one thing, after all. I might also rightly want to set the range of ISO automation, since maybe I don’t quite believe the result I get at ISO 100,000 qualifies as a “photograph”.So here’s an ISO menu. Every setting on that menu other than AUTO is an ISO priority setting. The way most camera companies went was to offer ISO “Auto” as just one more on the list of ISO settings, correctly making it indpendent of any other automation modes. On this camera, there would certainly be an associated setting to put user-selected limits on the auto ISO range. Some cameras also offer a range limit for shutter speed automation as well.