Go Back   Steve's Digicams Forums > Digital Cameras (Point and Shoot) > Nikon

Thread Tools Search this Thread
Old Mar 2, 2004, 7:31 PM   #1
Junior Member
Join Date: Jan 2004
Posts: 23
Default Digital functions vs equivalent film camera functions

Hi All,

I understand that the digi cam works by light striking the photosensitive ccd which generates an electrical signal which is in turn digitised and away the cameras software goes turning it into a picture.

The 5700 also has many functions similar to a normal film camera, like f-stop, shutter speed & film speed. What I am curious about is which of these functions are physical and which occur in software?
The easy ones (I think) are:
f-stop - physical, shutters physical aperture opening, same as film camera
shutter speed - physical time shutter open, same as film camera
focus & zoom - focus is physical, zoom is physical if in optical range, software if using digital zoom.

But what about film speed and the exposure compensation? With film speed it physically has a different sensitivity to light. How does the digi cam/CCD mirror this, is it in software or is it changing the sensitivity of the CCD hardware somehow with a global compensation factor? Do the film speed and exposure comp work in the same way, both just adjust the overall sensitivity to light of the CCD?

I would expect Image sharpening, Contrast, Saturation etc are all post-ccd software processing functions?

Quite interested in all this, as been doing a lot of reading from film camera books which provide lots of guidance on film speed, f-stop and shutter speed for different situations, but not sure how much is applicable to the CP5700. Time will tell of course, but interested what other's have found/know.

Paul_Mo is offline   Reply With Quote
Sponsored Links
Old Mar 3, 2004, 11:19 PM   #2
Junior Member
Join Date: Jan 2004
Posts: 23

I did some more playing around last night, and noticed that when you do expsosure compensation the shutter speed adjusts by maybe 10-15%. So is the exposure comp actually just fine tuning the shutter speed to get less/more exposure, or is it the auto shutter speed & f-stop reacting to the exposure adjustment?

Perhaps this question makes it clearer what I was getting at above.

Paul_Mo is offline   Reply With Quote

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

All times are GMT -5. The time now is 3:17 PM.