Can't adjust shutter speed in Tv shutter-priority mode
I just tried to use the Tv shutter-priority mode on my Rebel XT for the first time. When I turn the dial the shutter speed will only increase, reaching 4,000 (the max), but it will not decrease. Once it hit 4,000 it was stuck there. I had to use the "clear all camera settings" function to return to the default modes. When I went back to the Tv mode, the shutter speed was now 150. Again, I can only increase it, not decrease it, and once I turn the dial to a higher number, I cannot lower it. Can anyone help me?
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It may just be too dark for action photography. Try turning your ISO up to 1000+. Set your computer in Tv (Time Priority Mode). Use the top wheel to adjust the shutter time to something like 200 or greater. Keep an eye on the aperture value. If it starts flashing, you don't have enough light to support your settings.
If the camera appears to be working properly in some pictures and not others I'm going to suggest you look at your Shooting Modes. It's very possible that the mode dial has been turned to the TV mode which is Shutter Priority. With the Rebel having a shutter speed of 30 seconds to 1/4000 you may click the shutter to take a pictures and the camera appear not to take the picture. A few seconds later the shutter closes and the mirror drops. This also can happen if you are in the Night Portrait mode. The length of time my be longer if the lens cap is immediately placed on the lens.
Change your mode to "P" program until you become more familiar with the camera functions and settings
If your camera is a Rebel XS you should have a dial on the top right with a series of letters and icons. To set your camera so you manually control the shutter speed turn this dial too "TV" (Time Value). This setting will allow you to select the shutter speed and the aperture will open or close to achieve the correct exposure. The "M" is (Manual) where you would select both the shutter speed and aperture "AV" is (Aperture Value) where the user selects the aperture they want and the shutter speed increases or decreases to obtain a proper exposure. The "P" (Program) mode allows the camera to automatically select the shutter speed and aperture
There isn't enough light for that scene. 1/13th of a second is the fastest at that ISO (automatically set by camera in Basic Mode) and Aperture (auto set by camera too, in Basic Mode) that the camera can handle to provide a reasonably exposed image. Try using Tv on the Mode Dial, set a higher ISO (trade off is image noise) of around 800-1600 or even 3200 if available on your camera. Set shutter speed at 200-1000 (1/200th to 1/1000th of a second) and see if it freezes your subject. An external flashlight with hi-sync mode would help in this situation if the subject is not too far away.
For sports (or any fast moving occasion) you must be very particular about your settings. The Rebel Xsi takes great shots, but some tweaking needs to be done on your end, to make sure you don't get the "blur" and low quality that you may be experiencing.
On the settings dial, turn the mode wheel to "Tv". This is shutter priority, meaning you are controlling how fast the "shutter" closes. You need to have it set higher because you are trying to "freeze" a fast moving object.
After setting the selector to "Tv", you can change the speed by moving the "control wheel" left and right. (It's located above the ISO button, below the shutter button". If you look at your LCD screen while turning the wheel to the right (it makes a clicky sound), you will see the speed increase.
By default, it is set at 1/125th of a second. Increase it (1/200th of a second for example) and try that setting. You should freeze your target without blur.
If you are indoors and need a flash, the speed will max out at 1/200th of a second. Of course, if you need the flash, you will manually have to pop it up yourself by pressing the flash button when in "Tv" mode. It has a "lightning bolt" and is located near the "EOS" sticker on the front.
First off, welcome to the world of photography! Good luck and have fun!!!
Like any slr, you have the option of Manual exposure. I'm not familiar w/ modern Canons (I use Nikon). According to this page, however, you also have aperture priority and shutter priority. I'm pretty sure ALL modern Canons have bracketing modes as well (Use this for HDR).
I couldn't find the 450 manual (I'm assuming Canon's web devs are behind), but I did find the instruction manual for the 400 :
Should be similar, probably w/o some of the functions. Although you SHOULD have a book w/ your camera ;). Read it thoroughly.
Ok, according to the 400 manual, put your camera into Manual mode, then adjust the regular dial to adjust shutter speed. Then, to adjust aperture, hold in the A/V button while you adjust the same dial.
Like I said, may be a bit different. I think the dial may even be digital buttons rather than analog...