Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
06-30-2015, 06:04 AM   #16
Pentaxian




Join Date: Mar 2015
Photos: Gallery | Albums
Posts: 6,381
QuoteOriginally posted by dosdan Quote
If ISO affected the exposure, then these two settings would produce "equivalent exposures". But they don't. Setting #1 captures 4x the photons captured by #2. Since SNR due to shot noise is the sq-root of the number of photons, #1 will have 2x better Shot Noise SNR than #2. For example, if a pixel exposed using #1 captures 40,000e- (photo-electrons), it has a photonic SNR of 200:1. While in #2, there would be 10,000e- captured, with a SNR of 100:1.
This is why I'm hoping that future Pentax DSLR cameras will give us a little extra at the LOW end of the ISO scale. Forget shooting into the half-million; I'll be quite happy for my sensor to top off at the 51,200 I currently enjoy from my K-5 if they can push the low end down to fifty or even 25.

Give me that and a centre split-prism and I might even think about upgrading (especially if they un-cripple the K mount for the old M lenses).

07-03-2015, 06:50 PM   #17
Senior Member




Join Date: May 2014
Location: Delta, British Columbia
Posts: 148
In good light I mostly just stick to shooting in AV mode and set my ISO and exposure compensation accordingly with multi-segment metering. Here's an example shot set to f/8, ISO 200, -0.7 exposure compensation, and the camera giving shutter speed of 1/125. Since the dark stage filled most of the frame the camera exposed for it. Going through it in post processing I should have put in something closer to -2.0 exposure compensation. I could also have set to something like center metering, lock exposure on the banner, then recompose. First image is unprocessed, second image is post processed with -1.3 exposure, lowering of highlights, and increasing shadows.

Last edited by cgchang; 12-31-2015 at 12:17 PM.
Reply

Bookmarks
  • Submit Thread to Facebook Facebook
  • Submit Thread to Twitter Twitter
  • Submit Thread to Digg Digg
Tags - Make this thread easier to find by adding keywords to it!
aperture, camera, couple, discussion, exposure, iso, photography, post, shades, shutter
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
K-3 Exposure Button Stuck After Rain Exposure soroush Pentax K-3 & K-3 II 13 03-24-2015 09:20 AM
Sensor Discussion! Chime in please! alamo5000 Photographic Industry and Professionals 16 07-31-2014 04:48 AM
Pentax K-3 Video Discussion johnmflores Pentax K-3 & K-3 II 697 01-16-2014 01:41 AM
Pentax 35mm/50mm pricing mixup discussion Adam Photographic Industry and Professionals 204 12-27-2013 10:28 AM
Long exposure shots, ND filters and multi-exposure averaging rrstuff Photographic Technique 17 10-19-2013 12:50 PM



All times are GMT -7. The time now is 05:15 PM. | See also: NikonForums.com, CanonForums.com part of our network of photo forums!
  • Red (Default)
  • Green
  • Gray
  • Dark
  • Dark Yellow
  • Dark Blue
  • Old Red
  • Old Green
  • Old Gray
  • Dial-Up Style
Hello! It's great to see you back on the forum! Have you considered joining the community?
register
Creating a FREE ACCOUNT takes under a minute, removes ads, and lets you post! [Dismiss]
Top