On my Canon Rebel Xti, how do I mess near the feathery metering?
Answers: ****EDIT 1****
You said: "The assignment say we must have one photo for every stop on the scale"
Then you're messing next to exposure compensation. The other poster was on a similar track, and I thought his response could be correct too, but I assume there's a disconnect in argot here. What he's talking more or less IS the camera metering technique, it affects how much of the photo area the camera meters to determine the exposure.
My subsequent guess would be that you do have to use the +/- button, so try this. Put the camera within a creative mode like Av or Tv. Take a picture. Note the camera's exposure. Now you hold to PRESS AND HOLD the +/- button and then TURN THE MAIN DIAL NEAR THE SHUTTER RELEASE. You should see the exposure hypodermic adjust accordingly to one side or the other of the exposure syringe. This is exposure compensation, and I'm thinking if you need a photo at "respectively step", it means you must thieve a photo at each increment (1/3 stop). So, purloin a pic at exact exposure (needle in the center), press and hold +/-, turn it one click to the right/left, pilfer a pic, press and hold +/-, turn another click in alike direction. Repeat. I do not own an XTI, but this is usually the standard operating procedure for Exposure Compensation (EC). Look it up in the instruction manual if my method doesn't work. I'm not sure what modes EC works in, I do't know if it works surrounded by the auto modes (Sports, Portrait, etc), but I do know it works in Av/Tv/P, so try adjust EC in the auto modes as in good health.
*****ORIGINAL RESPONSE*****
When you're in full guide, the +/- more than likely doesn't do anything. That button forces the camera to adjust the settings it chose/metered by that amount, specifically, say for example the camera decide that f/4, 1/60 is the best in Tv mode and you dial contained by -1/3, it will shorten the exposure. HOWEVER, in your satchel....
The camera doesn't decide anything. In guide mode, YOU decide the exposure, so adjust the av +/- won't do anything. What you need to do surrounded by manual mode is scrutinize the exposure meter in the viewfinder. The "ideal" exposure according to the camera is when the exposure hypodermic is right in the middle e.g. where on earth the || is in my illustration
<--(-2)--(-1)--||--(+1)--(+2)-...
I reflect when you say rob it with different level of light, your instructor requirements you to adjust different variables, such as shutter speed and aperture, to see how it affects your exposure. If you adjust the exposure such that the needle slides towards the unenthusiastic (-) side, your pictures should come out darker, because refusal designates a shorter exposure, thus less table lamp is let contained by. Shortening exposure means decreasing the aperture (higher the number, smaller the opening), or increasing the shutter speed (e.g. 1/200 is smaller amount light than 1/100)
Check out the contact below, it's an awesome simulator that can show you quickly how adjust the aperture and shutter speed affects exposure.
you can't use it in full manuel and adjust the restrained. I don't have the exact camera, I hold the XT, but for me I have to conveyance it to the "creative" settings and then I step to the menu and am able to tweaking the levels. Hope this help at least rather :)
I have an XTi and it's simple, turn it on and at the fund of the body..ISO, AF, WB and "Metering", push the button (on the left side) for Evaluative, Partial or Center--Weighted average. Once you enjoy made your choice push the button in the center "SET" and afterwards push the shutter half course down and or just push the shutter partially way down later your set for that metering mode.
If you're in Manual Mode you control the camera. Actually, you could do this contained by Aperture Preferred Mode since as you control the f-stop the camera will adjust the shutter speed. If you're outside on a sunny day you might be capable of do it hand-held but a tripod is suggested.
Set your ISO to 200 (unless your instructor says different. It really doesn't event because the relationship holds.) The following is a hypothetical example of what will happen.
f2, 1/2000 sec.
f2.8, 1/1000 sec.
f4, 1/500 sec.
f5.6, 1/250 sec.
f8, 1/125 sec.
f11, 1.60 sec.
f16, 1/30 sec.
ISO 100
f2, 1/1000 sec.
f2.8, 1/500 sec.
f4, 1/250 sec.
f5.6, 1/125 sec.
f8, 1/60 sec.
f11, 1/30 sec.
f16, 1/15 sec.
All seven of your exposures contained by both examples are IDENTICAL. As you "stop down" i.e., let surrounded by less table lamp, the shutter speed decreases to allow satisfactory light to expose your film/sensor for correct exposure.
Here's why: f2.8 admit 1/2 as much light as f2; f4 admit 1/2 as much light as f2.8, etc. For correct exposure the shutter speed have to get slower.
The one and only discernible differences you'll see is an improvement contained by image part from f5.6 to f11 and an increase in Depth of Field from f4 on through f16.
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