Question About An Slr Camera

[chishnfips]

It says on the top it has Program AE which means the camera calculates proper exposure eg. 1/60 sec F8 but if you know its a portrait and you want a nicer out of focus background you can use a dial/button to pull the aperture down to F4 or whatever and it will change the shutter speed to keep the exposure correct.

I use mine almost exclusively on Aperture priority or manual for landscape/wildlife, I use F8 to 11 for landscape stuff most of the time and F4 or 5.6 for wildlife (to get sharpness from nose to ears!) with a 300mm lens. If you have amateur quality lenses you can pretty much leave the camera on F8 in aperture priority mode and let the meter work out the shutter speed as F8 usually gives best performance for non-pro lenses.

So what would happen if I were to decrease the shutter speed? would it result in over exposure?

and also how would I make something have a motion blur but have the background in focus? eg a car moving on a road. (the car looks blurred and the background is sharp.

 

[Puffer_freak]

It depends on the lighting. Over-exposure can sometimes be a good thing too...it depends on what kind of effect you're looking for!

To have the background in focus and the car not, you'd have to fiddle with shutter speed. Increase the shutter speed, and make sure you have an unmoving background. Make someone drive the car, snap the shot, and in theory, you may have managed to get a perfect shot!

In theory of course...never tried it myself...

 

[Cian McLiam]

In Program auto decreasing or increasing shutter speed will make corresponding adjustments to aperture to give 'correct' exposure, but of course correct exposure is subjective and often boring!

To get a sharp car with a streaked/blurry background you have to pan the camera while taking the photo. You need to use a fairly slow shutter speed, I'm not an expert in this area but around 1/30 sec to 1/15 sec might be a good starting point to experiment. When the car is approaching you start taking photos as quick as possible, keep your legs steady and move your upper body to follow the car as it passes while continuing to take pictures. With any luck one or two should come out ok after a bit of practise. For added effect and drama, tilt the camera to an angle.

That is the usual motor sport type of photo, to keep the background sharp and the car blurred (not a good photo according to pro's) just use a slow shutter speed like 1/30 sec but do not move the camera.

 

[chishnfips]

cool cheers for tips guys, I am going to a rally this weekend so I might try a few pics.