For this exercise, you were asked to find a situation that fulfils the following criteria.
- Daylight indoors ( For the amount of light – outdoor sunlight would be too bright to allow high ISO settings, while much darker would involve long time exposures)
- A combination of sharp detail and texture less areas ( Such as a white wall ) with some of the texture less area in shadow.
Set the camera on a tripod.
Start by taking a series of identical photographs, changing the ISO setting from one to the next.
Use the aperture priority setting so that there will be no difference in depth of field. My camera was set to F.4 and the ISO ranged from 100-6400
I decided to use the morning light, and photograph my wardrobe door, as it is white, and situated right next to my bedroom window. I stuck a black chandelier sticker onto it, as this was detailed and would help with showing noise.
I have included the original image, and a cropped section where I have zoomed in, to show the noise.
A clear image, but a small amount of noise has been introduced.
Noticeable noise, especially towards the top of the image where there is some shadow. You can begin to see noise in the dark shadow areas also.
Noticeable noise all over the image
Noticeable noise all over the image. More noticeable towards the top and in the shadow area.
Noticeable noise all over the image.
I will put the cropped images next to the ISO 100 and then I can compare them easier.
ISO 100 ISO 200
ISO 100 ISO 400
ISO 100 ISO 800
ISO 100 ISO 1600
ISO 100 ISO 3200
ISO 100 ISO 6400
When looking at the images magnified, I can see that with ISO 100 and ISO 200, the images are clear. With ISO 400, graininess begins appearing in the top area of the image, however, it is still usable as the detail on the sticker itself if clear. When I got to ISO 800, there is noticeable, yet faint, noise all over the image. The detail on the sticker is becoming less sharp. ISO 1600, the noise is increasing. With ISO 3200 and ISO 6400, there is significant noise all over the image, but it is worse towards the top of the image, where there seems to be a shadow, as the noise is more noticeable there. The detail on the sticker is blurred and not sharp. These images would be unusable. In my opinion, the best ISO to use in order to have less noise in your image is between ISO 100 and ISO 400. Any ISO after 400, you will begin to see noise in your image, even if you use a fast shutter speed.