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-   -   A510 - Opening the aperature is acutally increasing the shut (

acnj Jul 21, 2005 6:35 AM

I recently purchased a Canon A510.

One thing that I have noticed is that if I want to increase the aperature opening, I am actually decreasing the shutter speed.

For instance, if I am in a low light situation and lets say that the shutter speed is 1/10 of a second, I say to myself, "well, if I open up the aperature, I will increase the shutter speed which means that there won't be as much camera shake".

Actually, the opposite happens, when I "open the aperature", let's say by 1/3 stop, the shutter speed actually decreases to, let's say 1/6 of a second.

The point is that I am trying to make is that I am a little disappointed by the fact that, apparently, digital camera, at least point and shoots, don't have aperatures. Apparently, when you "open the aperature" all that you are really doing is increasing the shutter speed, which makes that camera more brone to camera shake.


sedges Jul 21, 2005 9:19 AM

You need to put the camera in the manual mode to adjust aperture and shutter speed independently.

In aperture priority you can choose the aperture, but the camera choses the shutter speed according to the conditions it senses.

In shutter priority you can chose the shutter speed and the camera choses the aperture according to conditions.

In the manual mode you have complete control over both. Whats wonderful is that the screen gives you an accurate representation of what the images will be at those settings. Never had that opportunity with a film camera.

Tom LaPrise Jul 21, 2005 10:25 AM

You sure you're using the aperture adjustment and not exposure compensation? "+1/3" EC would force a third of a stop more exposure, which is what you seem to be getting. The shutter slows down by roughly 1/3 stop.

(If there's an aperture adjustment, it actually has an aperture to adjust...)

Louddog Jul 21, 2005 5:31 PM

Are you adjusting the aperture the right way? Aperture is backwards.

Higher aperture number = smaller aperture = slower shutter

Lower aperture number = bigger aperture = faster shutter

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