Low light Help. Cannon Rebel T3i 18-55mm

[xxWesxx]

Okay, so im having issues with lowlight photography. If im needing a higher shutter speed...the image gets way to dark. If i try to raise the fstop, the image is not bright enough. How am i suppose to get a happy medium in there with out using external lights. Or onboard, or speedgun flash? And it seems, When i take pictures of a person with black shoes or black shirt, the image will get really noisy in those parts. Any suggestions? Thanks!

-Wes

 

[enzodm]

18-55/3.5-5.6: it is dark, so, no happy medium without using more light (whatever kind you like: sun, lamps, flash, etc). Or increasing ISO, of course, but I hope you already tried.
Noise is more visible in dark areas.
But:

If i try to raise the fstop, the image is not bright enough.

this is the way it works. If you raise f/ number, you are decreasing aperture, so image will be darker. If you increase shutter speed, again less light will reach the sensor, so image will be darker.
Google for "exposure triangle" to have an overall idea on how it works.

 

[tirediron]

The simple fact is, in many cases you can't! You haven't mentioned adjusting your ISO; increasing the ISO will allow you to use higher shutter-speeds and/or smaller apertures, but it will come at the cost of increased digital noise in the images. There's a reason that there are so much lighting equipment sold for photographers. We need it. A lot!

 

[xxWesxx]

Thanks guys! Ive looked at the exposure triangle, it actually helped so thanks guys! And i have 2 umbrellas and 2 stand lights. So i have the light. Most of the time i do photoshoots outside. It really wasn't dark, but it was dark enough that alot of my images came out to noisy or dark. D:

 

[KmH]

As far as the dark parts getting noisy, that is part of how digital images work.

Half of all the image luminosity data is in the brightest stop of light in the image.
Lets assume 4096 levels of luminosity in the entire image and the image has a dynamic range of 6 stops.
On that basis 2048 levels are in the brightest stop, leaving 2048 levels for all the remaining 5 stops of luminosity.

Like this:
Stop #6 (brightest) - 2048 levels (least visible image noise)
Stop #5 - 1024 levels
Stop #4 - 512 levels
Stop #3 - 256 levels
Stop #2 - 128 levels
Stop #1 - 64 levels. (most visible image noise)

http://www.adobe.com/digitalimag/pdfs/linear_gamma.pdf

See also - http://wwwimages.adobe.com/www.adob...ly/prophotographer/pdfs/pscs3_renderprint.pdf

 

[xxWesxx]

Thanks for the help!