Photo quality and shutter speed

[Chris71]

Hi,

I suspect I'm over-simplifying things here, but do you still need the same exposure times for (digital) photos taken set for a lower resolution and/or size? Are these purely considerations for file size or does it vary the amount of time required to collect the information?

Chris.

[ThatPhilBrettGuy]

You mean you set the camera to produce lower res jpg's etc? No, everything stays the same. The camera always takes full res pictures and just throws away pixels when it encodes the end result.

[Chris71]

ThatPhilBrettGuy said:

You mean you set the camera to produce lower res jpg's etc? No, everything stays the same. The camera always takes full res pictures and just throws away pixels when it encodes the end result.

I suspected that would be the case. I suppose a sort of logic says that absorbing less information should take less time, but I guess the difference is almost infinitessably small, even compared to the fastest shutter speeds.

[Neil G60]

That what ISO does ISO is the sensors' (or film's) sensitivity to light. A low ISO number (100 or 200) means that the sensor is LESS sensitive to light so it's good for bright or sunny conditions when the camera will opt for a fast shutter. A higher ISO (400 or 800) is a lot more sensitive to light so you can shoot handheld when it's darker without using a flash. Higher ISOs are more sensitive BUT they produce more "noise" - ramdomly coloured pixels in the image which make the image look fuzzy.

[ThatPhilBrettGuy]

Neil G60 said:

That what ISO does ISO is the sensors' (or film's) sensitivity to light. A low ISO number (100 or 200) means that the sensor is LESS sensitive to light so it's good for bright or sunny conditions when the camera will opt for a fast shutter. A higher ISO (400 or 800) is a lot more sensitive to light so you can shoot handheld when it's darker without using a flash. Higher ISOs are more sensitive BUT they produce more "noise" - ramdomly coloured pixels in the image which make the image look fuzzy.

What's ISO got to do with resolution or final picture size?

[Scho]

.
[/quote]What's ISO got to do with resolution or final picture size?
[/quote]


if you shoot at 1600 iso your pics will look good ok on the net but crap printed a3

[kybo]

They'll write a lot quicker to the card, and give you more continuous shots in 1 burst, I would imagine.

Are they images purely for web? I always shoot max and scale down as needed when processing. That way you cover every eventuality.

Scott

[ThatPhilBrettGuy]

Scho said:

.

What's ISO got to do with resolution or final picture size?

if you shoot at 1600 iso your pics will look good ok on the net but crap printed a3

I forgot the sarcastic smiley sorry. I was pointing out in a 'i'm-in-a-bad-mood-because-my-crap-company-forgot-to-pay-the-mobile-bill-and-we've-been-cut-off' kind of way that the ISO post, whilst correct, had nothing to do with the original post.