I have a Canon EOS Rebel XTi that I can't set the ISO speed. The ISO button is unresponsive, as are the AF, WB and redeye buttons. Is this a repair issue or is there a mode I should be in first before using these buttons?
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1) Put lens or camera cap on, go to a dark room to be sure if you want 2) Take JPG+RAW shot, maybe at different ISO and shutter speeds, one could be 30 sec/ISO 1600 3) Press menu, go to Settings 2 tab, and press sensor Cleaning: Manual, then OK. Wait for 30 seconds or more (is this necessary?) The mirror inside opens, but since you are not removing dust, this has really no effect, but it seems that after doing this, the camera remaps the dead pixels. 4) Take another JPG+RAW shot, compare with shots from 2) - same shutter and ISO
blurring occurs not depending on ISO, i think the lens is the problem. try to clean the lens glass carefully, is there some grease stick on the lens? if not it might be dislocated one of the lens structure. have you try another lens?
You need to understand the relationship and teractivity of aperture, shutter speed and iso. In Av mod, you choose the aperture and the camera makes thw shutter speed agjustment, In Tv mode, you set the shutter speed and the camera makes the aperture adjustment, In manual, you have to set both shutter speed and aperture manually. If the ISO mode is set to AUTO, the camera chooses the sensors sensitivity to light automatically. Change to specific ISO (200-400 for daylight and 799-1600 for night). Take a picture in AV mode and note what shutter speed the camera chose. Then switch to TC mode choose the same shutter speed and see if camera chose the same aperture(f-stop) you chose in first shot. Change to Manual and choose same f-stop and shutter speed the camera chose for you in the other modes. Compare all three photos. They should be almost if not exactly the same exposure wise. In Tv mode choose a dlowers shutter speed, In Manual choose a combo of slower shuuter and wider f-stop(smaller number). Read your manual.
Basically putting the camera in modes other than Manual, TV or AV means that's you've given up a lot of control, so the camera is left to its own devices to solve the scene. When shooting landscapes you need a large depth of field, which means the camera chooses a higher F-number for your photo. Higher F-numbers mean less light gets into the camera, since the shutter speed has to stay high enough for you to shoot handheld. So now you've got two things t work which reduce the amount of light hitting the sensor: small aperture (high F-number) and fast shutter speed. Since the camera meters the scene and has only one remaining factor to get "correct" exposure, all it can do is set the ISO according to the two other mandatory settings of F-number and shutter speed. If there's enough light (bright, sunny day) then it can remain at ISO 100, which is usually the best quality image. If there's insufficient light though, then it may go as high as ISO 800 or even ISO 1600 to allow the small aperture and fast shutter speed. This will make your photos look grainy.
Instead, I recommend that you set the camera to AV Mode, put your F-number to F8.0, set your ISO manually to ISO 100, and use a tripod. Additionally you can use the custom functions menu to lock up the mirror (prevents "slap" which shakes the camera and makes the image less sharp) and also use 2-sec timer (select it using the button to the left of "set" on the back of the camera).
Following those steps you should get the sharpest photos your lens and camera body will allow. Be sure to use autofocus by defeault and switch to manual if you want to fine-tune (or if AF is "hunting" and not locking on a target) and also turn Image Stabilization OFF if using a tripod. Good luck!
Frustrating I am sure. I had the same problem on my first XTi. I cannot remember what the settings were, but I think I was set for portrait and had flash set as the white balance default source. Therefore the camera always popped up the flash assuming that I wanted or needed fill flash.
Change you white balance to sun/shade/tungston etc as is appropriate, choose a faster ISO speed in lower light levels and try using the P or Tv mode and use a shutter speed that generates a middle range aperature for your particular lens.
When not in Auto mode you can up the ISO setting buy using the top semi circular button on the right side at the back of the camera. This adjusts the sensitivity of the camera so that not as much light is needed. The higher the ISO setting is the more sensitive the camera is. The trade off is that your pictures will have more"noise" in them. This is visible almost as a graininess if you enlarge the photo. The trick is to try and balance the amount of sensitivity,ie. the ISO with the acceptable amount of noise.
You need to set your Mode Dial to one of the modes in the creative zone (i.e. one of the modes: P, Tv, Av, M or A-DEP) in order to access the AF, ISO and WB menus. Those menus are not displayed when the Mode Dial is set to one of the Basic Zone modes.
Hope this helps
On the back of the camera to the Right of the LCD there is a up-down-left-right-center switch. push the up one. (Labeled ISO) then use the same selector switch to select the ISO you want and then press the shutter half way down. If you are shooting in a low light situation, the auto focus sometimes will not work. Change the switch on the lens from AF to MF and focus manually.