On Monday, 28 September 2015 17:50:29 UTC+1, dennis@home wrote:
On 28/09/2015 12:42, whisky-dave wrote:
On Friday, 25 September 2015 22:49:23 UTC+1, NY wrote:
"dennis@home" wrote in message
eb.com...
On 25/09/2015 16:27, whisky-dave wrote:
Why call it a stop one have such strange stop
numbers....... why does f5.6 let in twice that of f8

f number is a measure of aperture *diameter* relative to lens focal length.



Its the same as a film camera, where do you think it differs?
Why do you even think it might differ?

My thoughts exactly. I can't work out whether he really doesn't know or is
winding us all up. Film and digital cameras have more in common that maybe
he realises.

They sure do, but there are some important differncies.

You still haven't said what they are, I don't think you know.

if you don't know I'm not listing them for you.
We are also talking about qwhich is best for teaching photography.
Teaching photography adn gettiogn a good picture aren't the same.



yes the meter is judging this isn't good if you're teaching the subject.

So you propose not using a light meter while teaching photography.

No I've vere said that. are you sugeswstin we don;t need a light meter because we have a digital camera ?.


Why does the image on my LCD look the same irrespected of the
aperature and shutter speed I set.

Because you have a cr@p camera

wrong answer .

It was the polite one.

but still wrong.


and can't set the image to look correct at
a guess. On mine if you stop down, the image darkens when you do DoF
preview just like an old fashioned camera.

does it still darken if you don't do a DoF. ?

Why should it,

cause the f..king sun goes in or it gets dark or night approaches.
you know brightness changes throught they day.
Your LCD and eyes react to changing light levels differntly and to colur differntly.




the diaphragm in the lens doesn't close unless you do a
DoF check,

or when taking a photo.

the same as on a film camera or are you proposing that only
manual lenses are allowed.

if you want to learn about lenses use a manual lens, just like you would a car.




Seems you're getting corect exposure and DoF confused.

Seems you're getting photography confused.