Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
01-28-2011, 02:42 PM   #16
Pentaxian
Class A's Avatar

Join Date: Aug 2008
Location: Wellington, New Zealand
Posts: 9,070
QuoteOriginally posted by ll_coffee_lP Quote
... underdeveloping (or shooting to the left) will only yield you smaller dynamic range (pending whether you go off the scale), or at best introduce lots of noise when you push the exposure in post.
I think it is worth repeating that this (emphasis above is mine) is not true. Underexposure by decreasing shutter speed can yield a great image whereas the properly exposed one would suffer from unwanted motion blur. What you said is only true for static scenes and the absence of any camera movement.

01-28-2011, 03:44 PM   #17
Senior Member




Join Date: May 2010
Location: long island
Posts: 135
Original Poster
thanks guys! I believe K-5 keeps enough details even when EV is decreased. But still, doing this is at least not a better way than increase the ISO.

Another thing to consider, though, is that when the DR of the image I want to capture is huge, decreasing the EV in K-5 may help capture the details in all areas. But that's nothing related to shuuter speed...

thanks again!
01-28-2011, 04:33 PM   #18
Veteran Member




Join Date: Sep 2007
Location: USA
Posts: 1,812
QuoteOriginally posted by shang Quote
thanks guys! I believe K-5 keeps enough details even when EV is decreased. But still, doing this is at least not a better way than increase the ISO.
You didn't say your acceptable upper ISO limit.

Obviously everyone's tolerance is different -
however might want to do your own tests on the K-5 through the ISO range
then size for final output and see where that new K-5 limit might be....

The K-5 is very good at high ISOs - currently one of the best among APS-C sized sensors - for a 16Mp it matches the sterling low light 12Mp K-x at equivalent high ISOs.

I certainly find I can shoot with impunity at ISO3200 on the K-x - but at low light venues I am more than happy to shoot at ISO5000. I am sure the K-5 can do as well....

But like I said everyone's tolerance is different -
the only real way to know for sure is to shoot one's own tests and see -
eg: please see my tests in - Kx (jpg) ISO Performance.

K-x ISO5000

K-x, ISO5000, f/3.5, 1/15, 18mm

Notice the bass player in the deep shadows
to the right edge of the frame,
only just about discernible -

ISO5000, f/4, 1/8, 28mm -
this was grossly under exposed -
probably due to being past the lower metering limit -
so I had to bring up the brightness/contrast quite a bit to make it visible.
So again this is an inadvertent example supporting your idea of pushing to get higher shutter speeds.

Even under the main lights the K-x still chose ISO5000 -

ISO5000, f/4.5, 1/25, 40mm

EDIT to ADD -
here's another inadvertently grossly under-exposed shot due to the light level being below the minimum metering limit of the K-x -
frankly I was really surprised by the details that were reveal when I simply increased the brightness/contrast levels -
I mean I could hardly discern anything in the original dark pic:

only increase in brightness/contrast and standard (level 1) sharpening.....

[NOTE: I have replaced the PP increased brightness shots -
because although on my monitor they looked just fine -
I happened to look at them on an over bright huge wide-screen Mac monitor
and the shadow/black areas looked pretty cruddy -
so I just ran these small pp jpgs through deNoise.]

Last edited by UnknownVT; 02-14-2011 at 10:44 PM.
01-29-2011, 07:57 PM   #19
Inactive Account




Join Date: Jan 2008
Location: Ontario, Canada
Posts: 1,972
QuoteOriginally posted by Class A Quote
I think it is worth repeating that this (emphasis above is mine) is not true. Underexposure by decreasing shutter speed can yield a great image whereas the properly exposed one would suffer from unwanted motion blur. What you said is only true for static scenes and the absence of any camera movement.
I'm pretty sure I clearly indicated that it would lead to less dynamic range pending going off the scale.

If you shoot to the left you can bottom out on "0" light. Can't pull info out that doesn't exist.

If you shoot the right you can pull data back into the photo (especially if you shoot RAW).

Properly exposing is always best.

I didn't indicate you couldn't pull up an under exposed shot, just that you run the risk of having no data if you aren't careful with your histogram.

c[_]

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!
camera, dslr, ev, photography, shutter
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
=Can K100d Noise Reduction be turned on for shutter speed faster than 1/4"? mpmetro Pentax DSLR Discussion 0 01-11-2011 01:09 PM
is SDM speed faster on newer bodies? Reportage Pentax DSLR Discussion 7 07-26-2010 10:57 PM
Faster AF-speed!? AndersPS Pentax DSLR Discussion 4 06-09-2010 08:12 AM
Which film has most DR & which classic Pentax cameras have 1/2000 or faster shutter? brkl Pentax Film SLR Discussion 38 04-08-2009 08:16 AM
Is Da 70mm f2.4 faster in AF speed comparing to Fa 77 Ltd? roentarre Pentax SLR Lens Discussion 17 02-10-2007 07:55 AM



All times are GMT -7. The time now is 08:57 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