Free Shipping on ALL Products
camera reviewsbest cameraslens reviewsphotography tipscamera forumvideo toursphotography bookssupport me
It is currently Sat Jul 26, 2014 3:39 am

All times are UTC




Post new topic Reply to topic  [ 8 posts ] 
Author Message
PostPosted: Mon Jan 28, 2008 10:02 pm 
If this is infact true, why do people complain about cameras with small sensors and many megapixels? Couldn't they just lower the amount of pixels for the photos in dark spaces, and when you wan't to make pictures for a poster you could turn it up ?


Last edited by DavidBudde on Tue Jan 29, 2008 3:51 pm, edited 1 time in total.

Top
  
 
 Post subject:
PostPosted: Mon Jan 28, 2008 10:05 pm 
Offline
Site Admin
User avatar

Joined: Tue Nov 08, 2005 3:32 pm
Posts: 9962
Location: Queenstown, New Zealand
Hi David, i think you got cut-off there!

Think of it as surface area. Bigger sensors or those with fewer pixels can have bigger pixels which are more sensitive to light - hence less need for signal amplification at higher snesitivities - and hence less noise. And higher tonal range too.


Top
 Profile  
 
 Post subject:
PostPosted: Tue Jan 29, 2008 7:33 pm 
yeah i did get cut-off. i added the rest now. maybe u see my point.


Top
  
 
 Post subject:
PostPosted: Tue Jan 29, 2008 7:59 pm 
Offline
Site Admin
User avatar

Joined: Tue Nov 08, 2005 3:32 pm
Posts: 9962
Location: Queenstown, New Zealand
Hi David, this in fact already happens for the highest sensitivities on compacts - it's called pixel-binning, and is why at, say, 3200 ISO, the resolution drops.

But it has to drop a lot - for easy processing, you'd need groups of four pixels, which would quarter your resolution.


Top
 Profile  
 
 Post subject:
PostPosted: Tue Jan 29, 2008 8:03 pm 
oh okay,
but if i would have a camera with 8 megapixels and i drop the resolution to 4 using the settings, would the noise on my pictures be half as bad ?


Top
  
 
 Post subject:
PostPosted: Tue Jan 29, 2008 8:06 pm 
Offline
Site Admin
User avatar

Joined: Tue Nov 08, 2005 3:32 pm
Posts: 9962
Location: Queenstown, New Zealand
It depends on the camera and if they implement this technique - sadly I think most don't. And there might not even be a quarter resolution mode on certain models. Dropping from 8 to 4 wouldn't be enough - you'd need to drop from 8 to 2 to allow groups of four pixels.

David, this is something you'll need to test to find out for sure!

It's an interesting one though, so do share the results - and also compare shooting at full re, then down-rezzing in software...


Top
 Profile  
 
 Post subject:
PostPosted: Tue Jan 29, 2008 8:12 pm 
mh.. yeah. it would be useful with cameras which have huge megapixel amounts like 21 or above.


Top
  
 
 Post subject:
PostPosted: Tue Jan 29, 2008 8:37 pm 
Offline
Moderator
User avatar

Joined: Sat Sep 30, 2006 4:30 pm
Posts: 9805
Location: UK
.
Not quite on-topic but I have been discussing the implications of large sensors and/or high pixel counts over in the Canon forum. The post Diffraction towards the end of the thread picks up the topic of (yes, you've guessed it) diffraction and how high pixel densities demand aberration free and relatively fast (low f-number) glass in order to get the best from such sensors.

Bob.

_________________
Olympus OM-D E-M1 + M.Zuiko Digital ED 12-40mm f/2.8, Lumix 7-14mm f/4, Leica DG Summilux 15mm f/1.7 ASPH, M.Zuiko Digital 45mm 1:1.8, M.Zuiko Digital ED 75mm 1:1.8.
Leica D Vario-Elmar 14mm-150mm f/3.5 - f/5.6 ASPH.
OM-D E-M5, H-PS14042E, Gitzo GT1541T, Arca-Swiss Z1 DP ball-head.
Astrophotography: TEC 140 'scope, FLI ML16803 camera, ASA DDM60 Pro mount.


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 8 posts ] 

All times are UTC


Who is online

Users browsing this forum: No registered users and 1 guest


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum

Search for:
Jump to:  

All words, images, videos and layout, copyright 2005-2012 Gordon Laing. May not be used without permission.
/ How we test / Best Cameras / Advertising / Camera reviews / Supporting Camera Labs

Webdesign by Alphabase IT
Powered by phpBB® Forum Software © phpBB Group