A high ISO also means introduces a significant amount of noise and grain to the image which is why we tend to keep it as low as possible. Using a higher ISO means that the camera sensor is more sensitive to light and allows for a shorter shutter speed in order to get the same exposure. Aperture F/9,Shutter Speed 1/320, ISO-200,Focal length 18mm and Max aperture 3.6 and the lens I used was Nikon DX VR AF-S Nikkor 18-105mm 1:3.5-5.6G ED. A difference of 1 in E V corresponds to 1 'stop' (+1 stop 2 x. The development of this new zoom lens was based on smc PENTAX-DA FISH-EYE10-17mmF3.5-4.5ED, while conducting a thorough review of lens coatings. This number depends on the amount of light present in a scene, either natural light (sun/moon) or artificial (strobe/lamp). Focal length: 18mm Aperture: F/6.3 Shutter speed: 1/400sec ISO: 200 Image size: 4000. Aperture: F16, Shutter speed: 1/500sec, Focal length: 10.0mm, White balance: Daylight, ISO sensitivity: 400, Finishing touch/Custom image: Vibrant Photo by Takuma Kimura. That’s why we need to make some compromises. The combination of shutter speed, aperture and film speed/ISO (and light modifiers) are expressed as EV or 'Exposure Value'. In the above example, at aperture of f/3.5, shutter speed of 1/125th of a second and ISO 200, if you were to increase the ISO to. If you were to change your ISO from 200 to 400, you would be making the photo twice as bright. During the night, however, it’s often pitch black and using the same settings as in the daytime will result in, you guessed it, pitch-black images. Lower numbers mean lower brightness, while higher numbers mean higher brightness. During the daytime, a low ISO is preferred due to less noise and grain. Night photography is in many ways the opposite of regular landscape photography. An example of the use of f-numbers in photography is the sunny 16 rule: an approximately correct exposure will be obtained on a sunny day by using an aperture of f /16 and the shutter speed closest to the reciprocal of the ISO speed of the film for example, using ISO 200 film, an aperture of f /16 and a shutter speed of 1 200 second. Read More: Introduction to Aperture in Landscape Photography You Need a High ISO It just means that you need a higher ISO or slower shutter speed to get a similar result. That doesn’t mean that you can’t get good pictures with an f/4 lens, though. Wide-angle lenses with a fast aperture such as f/2.8 are preferred for night photography but, unfortunately, they are often double the price of lenses with a maximum aperture of f/4.