Effects on changing arperture, ISO, and shutter speed on the picture quality in night

R

Rosalee

New member
A larger aperture will result in a smaller Depth of field. Meaning the area that is in focus will be much smaller than if you had your aperture opened to lets say f/8.

A Higher ISO will result in a more noisy image so you don't want to put your ISO too high. Depending on your camera I'd say put it around 400 or lower. If you have a really great DSLR you can go higher.

A slower shutter speed will result in a blurred image without a tripod ( unless you have REALLY steady hands). It can also help in portraying motion. In your case, you will want to use a tripod if you use a shutter speed at 1/60 or lower because your hand will most likely be too shaky for how long the camera's shutter needs to stay open.
 
photography? So, i'm trying to do some long exposures of stars. I can achieve the brightness by either opening up the arperture, increasing the ISO speed, and decreasing the shutter speed. What I would like to know is what's the difference in getting the exposure by say.. increasing the ISO instead of opening up the aperture, and vice versa etc.? If I'm shooting stars, what factors should I change to get the right exposure and what factors should I try not to change? Thanks!
 
A higher ISO will result in increased digital noise so keep it low.

Another source of digital noise in long exposures is from the sensor heating up so choose a cool night.

Here is a site that will help you:

http://www.danheller.com/star-trails.html
 
The stars appear to revolve around the pole star (in the northern hemisphere), so If you point the camera at it and have a long enough shutter speed, they will produce traces around it, like the image in the link below.

Not sure about the ISO- I'm old school; it used to be a tie off between grain and short exposure times.
Assuming it's similar- you won't be shooting stars without a tripod, so exposure time isn't an issue (if you want the blurring effect- it's probably a bonus!)
 
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