Question about Canon EOS 40D Digital Camera

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How do I change the aperature in the manual mode. As I change the shutter speed using the top dial, that works fine however, I'm having trouble using the dial on the back to change the aperature. What should I do?

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  • 58 Answers

Make sure that the power switch is in the correct position.
It actually has three positions:

  • Off
  • On (with quick control dial disabled!)
  • Third position (quick control dial enabled!)
So, when the power switch is in the middle position (ON), the rear control dial is disabled in order to save you from inadvertently changing the setting, when you are wearing the camera on a neck strap.
So be sure to put it in the third position.

Posted on Mar 17, 2010

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How to change the shutter speed on my nikon n65 film 35mm slr camera


In the manual and shutter-priority modes (set the dial to "M" or "S"), turn the command dial to change the shutter speed. In the aperture-priority mode (set the dial to "A"), turning the command dial changes the aperture and the camera will set the shutter speed appropriately.

If you need a manual, you may download a copy from here.

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How do you set the aperture and shutter speed independently


First, make sure you're in the manual exposure mode, not manual focus mode, as set by turning the mode dial to the "M" position.
In manual exposure mode, turning the main command dial should change the aperture, while turning the subcommand dial should change the shutter speed.
If the two command dials don't have the expected effect, reply to this post and we can troubleshoot further.

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If you move from mode to mode, the camera will remember the settings from the last time you were in that mode and reset to them. This is handy if you are in shutter priority shooting sports at a high shutter speed, and then want to take a picture of something that's not moving fast, like the crowd. You just pop it into aperature priority with a remembered settings of a higher f stop.

I use this to shoot the scoreboard, which has a fairly slow refresh rate and usually comes up blank if I shoot it at a shutter speed higher than about 1/100.

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Can't adjust aperature in manual mode.


1. Check the power switch is pointing to the rear dial (not "ON") or you wont be able to set your aperture.
2. Try shooting one image for each position of the mode dial on the top. Then review each image to see what mode the camera indicates the image was taken.(Pressing info during playback will bring up detailed information to show this) If the recorded setting and actual setting dont match, this indicates a fault with the dial.
3. If the camera does not display an aperture, or shows "00" then there is a communication fault with the lens. Check the contacts are clean and sitting correctly. You can confirm this lens is at fault by trying another lens on your camera,I'm sure a photo store could help with this.
Good luck!

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You should download a manual.

Specs say it is an autofocus and autoexposure camera with limited manual input required.

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Cannot take indoor photos without flash


Hello,

Just as "Wrestling" explained, your camera is operating properly. There simply isn't enough light in the scene that you are trying to photograph. If you're new to photography, it's sometimes hard to remember that the human brain/eye combination is an incredible thing, and no camera can compete with a human being.

What I mean is, there is enough light in your room for your eyes to see detail, but not enough for your camera to 'see' the detail without additional light from your flash. However, there are a couple things you can try.

1. Raise the ISO setting on your camera (check your manual, it's easy). Turn the camera on, press and hold the ISO button (left top of camera) and rotate the main command dial (back of camera, upper left corner). Rotate left or right to lover or raise the ISO number. Watch in the top information panel as the ISO numbers change. Higher ISO numbers mean the camera is more sensative to light; you can take pictures when there is less light available. HOWEVER, there is a trade-off. The higher your ISO number, the more noise/grain your image will have. I think the ISO of the D200 is acceptable for enlargements (8x10's) up to about ISO 640 or 800. I'm very picky, you might find higher ISO settings work fine for your needs, especially if you are not making larger prints. Experiment! remember to change your ISO back to a lower setting when you're done with your low light pictures.

2. Take your camera off the fully automatic "P" mode (where the camera makes all the decisions), and change your shutter speed to a slower speed. The slower shutter speed lets more light into the camera, because the 'eye' (the shutter) is open longer. (Use the "S" mode where you set the shutter speed and the camera selects an appropriate aperature). HOWEVER, there is a trade-off again. The slower your shutter speed the more likely you are to have blurred pictures; your subject will move or your camera will shake. If you're taking pictures of a stationary object or an adult, you can tell the person to sit very still and experiment! As for reducing camera shake, first and foremost, learn to hold the camera properly. I can't stress this enough...it's the biggest reason for blurred photos that I see. learn/practice squeezing the shutter realease, not stabbing it. Then, invest in a lens with the Vibration Reduction feature.


3. Take your camera off of the fully automatic "P" mode and change your aperature. (If you like, you can use the "A" mode where you set the aperature and the camera selects the shutter speed for you). The aperature is how wide open the shutter "eye" opens with each picture. Think of your own eye. In bright sunlight, your pupils close down to small openings, as there is a lot of light available. If you are in a dark room, your pupils open as wide as possible to let as much light into your eye as possible. That's the same way a camera works. So, if you are in a darker room, you need to let more light into the camera...that means a larger aperature. The tricky part to remember is that the LARGEST aperature has the smallest number. That means a 3.5 aperature is a larger opening than an aperature of 16. HOWEVER, once again there is a trade-off, as a larger aperature means you have a smaller depth-of-field; depth of field means the area of your picture that is in focus. I'm sure you've seen landscape photos, where every detail is in sharp focus, the far away mountains and clouds, as well as small rocks and grass or a steam in the forground. That is created by a small aperature with a wide/deep depth of field. Then think of a portrait in a magazine or taken by a studio, where the person is in focus, but the background fades off into a pleasing blur. That's done with a large aperature and a narrow/shallow depth of field.

NOTE: The widest aperature available is determined by your lens, so you can't use all the aperature settings with every lens. Your camera knows this and will only adjust to whatever your lens has available. That's why you might have different settings available with different lenses. Experiment!!

OK, sorry if that was long-winded, but the D-200 is a great camera, yours is operating properly, and I want you to enjoy using it!

Jan 01, 2009 | Nikon D200 Body Only Digital Camera

3 Answers

Nikon NEWBIE


put simply the ISO number is how sensitive the film is to light, the higher the number the more sensitive the film. The ISO on the camera sets the exposure system to give the proper exposure for that film (the f/n80 usually sets the ISO automaticly). Also the higher the ISO the more grainy the picture, I would recommend using ISO 200 film for the pictures you describe. I would set the camera to the P setting it is a good all-around setting.

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Check the operators manual - you need to 'activate' the aperture control.

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The aperature error is due to the fact that the lens in not a constant aperature design. The settings on the LCD are assuming you are at full wide angle setting. As this lens moves towards telephoto, the aperature changes about 2/3 of an f-stop due to the mechanical movement of the lens elements. So a manual setting of f4.0 at full telephoto will be more llike f5.0 in reality. It is too bad Epson could not make the mechanical aperature adjust to compensate, but every nice feature costs something. I have not had any issue with the shutter speed changing. One guess is that the camera has shutter speed/aperature combinations that it can't achieve due to mechanical limitations, so it chooses the available combination. Another is that it wasn't in manual mode, but rather aperature priority mode and the final adjustments changed the speed.

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