PIX 2015

Sensor sizes and f stops

Started Jan 25, 2014 | Discussions thread
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Re: Sensor sizes and f stops
In reply to starlight110, Jan 30, 2014

starlight110 wrote:

wyldberi wrote:

Unfortunately, I'm having a difficult time following you. The f-stop measurement of a lens refers to the size of the lens aperture; this controls how much light the lens captures. The higher the number, the smaller the hole, and the less light you have being captured. Less light means you will have a poorer image quality being recorded. The image will be less sharp, and contain less detail.

The f-stop has nothing to do with the sensor.

Also, I don't think it's possible to equate image quality produced by a still camera with a given sensor size to a video camera with the same size sensor. They are two different systems. Video cameras used in television studios to produce live or taped broadcasts use sensors that are smaller than the sensors used in digital cameras.

In still image cameras, the only real advantage a 24mm x 36mm sensor has over a sensor measuring 16mm x 24mm is when it comes time to print the pictures each captures in enlargements measuring 2 meters x 3 meters. That's where the noise shows up. Print the same images at 24cm x 36cm and you won't be able to tell the two pictures apart.

The bottom line is, if you want to capture real time moving objects moving around you, get a video camera. If you want to take still pictures, get a camera that's built for that purpose. Don't handicap yourself by buying the wrong tool and trying to force it to do what you thought it would.

Thanks for clarifyng a bit, I´m a newbie in photography, I have the idea, a bigger sensor means better image and video quality and maybe better light sensitivity (of course for this, other factors like the lense is decisive) , I might be completly wrong in comparing digicams and camcorder videos but viewing videos full HD in YouTube I came to the conclusión that digicams with bigger sensors like 1/2,3´produce better looking and more detailed videos than digicams with 1/5,8´ sensors. But of course it could be only my impression only

The sharpness of an image is largely determined by the lens that casts the image circle onto the sensor. The only reason larger sensors seem to provide a better image quality is because they pack more light sensitive diodes into the sensor. When you pack the diodes too closely together, they start generating digital noise. The only time this comes into play is when you start printing your images really large, say, 5 feet by 7 feet.

You Tube is not a very good test platform to judge the comparative advantages of one camera over another. Transmission over the internet leaves a lot to be desired.

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