Go Back   Steve's Digicams Forums >

Reply
 
LinkBack Thread Tools Search this Thread
Old Jun 25, 2020, 9:02 AM   #1
Senior Member
 
Shinnen's Avatar
 
Join Date: Jan 2013
Posts: 391
Default Canon SX240HS CMOS sensor

I have two questions:
1. I just bought one of these cameras, used, needless to say; and It has basically two options wrt iso ..... auto or one of the choices from 100 to 3200. (In auto, It often defaults to 400 or higher.) Do I have to rethink my iso mindset which comes mostly from using cameras with CCD sensors. (By the way, it's a BSI CMOS sensor, if that matters.)
2. A more general question. Is the CMOS sensor better than the CCD? It seems like a lot of cameras are still made with CCD sensors.
Thanks,
.......... john
Shinnen is offline   Reply With Quote
Sponsored Links
Old Jun 25, 2020, 5:04 PM   #2
Senior Member
 
TCav's Avatar
 
Join Date: Sep 2005
Location: Washington, DC, Metro Area, Maryland
Posts: 13,761
Default

Quote:
Originally Posted by Shinnen View Post
1. I just bought one of these cameras, used, needless to say; and It has basically two options wrt iso ..... auto or one of the choices from 100 to 3200. (In auto, It often defaults to 400 or higher.) Do I have to rethink my iso mindset which comes mostly from using cameras with CCD sensors. (By the way, it's a BSI CMOS sensor, if that matters.)
What mindset is that?

Quote:
Originally Posted by Shinnen View Post
2. A more general question. Is the CMOS sensor better than the CCD? It seems like a lot of cameras are still made with CCD sensors.
See https://en.wikipedia.org/wiki/Image_...._CMOS_sensors
__________________
  • The lens is the thing.
  • 'Full Frame' is the new 'Medium Format'.
  • "One good test is worth a thousand expert opinions." - Tex Johnston, Boeing 707 test pilot.
TCav is offline   Reply With Quote
Old Jun 25, 2020, 5:53 PM   #3
Senior Member
 
Ozzie_Traveller's Avatar
 
Join Date: Jan 2011
Location: Australia, New South Wales central coast
Posts: 3,546
Default

G'day John

Memory from all the superzooms I have owned says that buried in the Setup -or- Record menu is an option for "max ISO when in Auto-ISO mode"

Hope this helps
Phil
__________________
Has Lumix mirrorless & superzoom cameras and loves their amazing capabilities
Spends 8-9 months each year travelling Australia
Recent images at http://www.flickr.com/photos/ozzie_traveller/sets/
Ozzie_Traveller is offline   Reply With Quote
Old Jun 25, 2020, 6:39 PM   #4
Senior Member
 
Shinnen's Avatar
 
Join Date: Jan 2013
Posts: 391
Default

Hi TCav,
My mindset is that in order to get relatively noise free images (with CCD sensor) one should try not to exceed iso 200.
........ john
P.S. Thanks for the shortcut

Last edited by Shinnen; Jun 25, 2020 at 6:40 PM. Reason: additon of post script
Shinnen is offline   Reply With Quote
Old Jun 25, 2020, 6:42 PM   #5
Senior Member
 
Shinnen's Avatar
 
Join Date: Jan 2013
Posts: 391
Default

Quote:
Originally Posted by Ozzie_Traveller View Post
G'day John

Memory from all the superzooms I have owned says that buried in the Setup -or- Record menu is an option for "max ISO when in Auto-ISO mode"

Hope this helps
Phil
Hi Phil,
Yes, that's my experience too. I didn't see it, but I'll have another look.
Thanks,
..... john
Shinnen is offline   Reply With Quote
Old Jun 25, 2020, 10:39 PM   #6
Senior Member
 
TCav's Avatar
 
Join Date: Sep 2005
Location: Washington, DC, Metro Area, Maryland
Posts: 13,761
Default

Quote:
Originally Posted by Shinnen View Post
My mindset is that in order to get relatively noise free images (with CCD sensor) one should try not to exceed iso 200.
There are so many variables that affect the level of image noise, that making a blanket statement that one type of sensor is inherently better at producing low image noise than the other, isn't necessarily valid.

Try it and see how much noise you're willing to accept. The best way to do that is to take a sequence of photos of a clear blue sky at different ISO Settings. You'll get noise in all of them, but you'll see the level of noise as it relates to the ISO. But keep in mind that noise is masked by detail. In addition, the process of upsampling (to print) or downsampling (to display on a computer screen, will reduce image noise.
__________________
  • The lens is the thing.
  • 'Full Frame' is the new 'Medium Format'.
  • "One good test is worth a thousand expert opinions." - Tex Johnston, Boeing 707 test pilot.
TCav is offline   Reply With Quote
Old Jun 26, 2020, 11:19 AM   #7
Senior Member
 
Shinnen's Avatar
 
Join Date: Jan 2013
Posts: 391
Default

Hi TCav,
Well, this camera can produce ok levels of noise at iso 1600, where the same iso setting in any of my cameras with CCD sensors will produce extremely noisy images.
The article you referenced says that the CMOS sensor is cheaper to produce, yet it 'seems to me' that they command a premium price in the consumer market. Is this marketing, something like the fact that car manufacturers continue charging more for a car with automatic transmissions, even after they became cheaper to produce then the same car with manual transmission?
........ john
Shinnen is offline   Reply With Quote
Old Jun 26, 2020, 1:30 PM   #8
Senior Member
 
TCav's Avatar
 
Join Date: Sep 2005
Location: Washington, DC, Metro Area, Maryland
Posts: 13,761
Default

Quote:
Originally Posted by Shinnen View Post
The article you referenced says that the CMOS sensor is cheaper to produce, yet it 'seems to me' that they command a premium price in the consumer market.
That may be true in general, but sensor manufacturers love to monkey with the technology, so the same generalization may not apply to the "BSI-CMOS' sensor in your SX240.
__________________
  • The lens is the thing.
  • 'Full Frame' is the new 'Medium Format'.
  • "One good test is worth a thousand expert opinions." - Tex Johnston, Boeing 707 test pilot.
TCav is offline   Reply With Quote
Reply


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 On
Pingbacks are On
Refbacks are On



All times are GMT -5. The time now is 11:21 PM.