Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
03-22-2012, 08:18 PM   #1
Inactive Account




Join Date: Feb 2012
Photos: Gallery
Posts: 24
ISO Settings

Hi,

I have a question concerning ISO going beyond what it has been set. Here were my situations:

Lens: Standard Prime 01
Mode: Aperture Priority f/1.9
D-Range: Auto
ISO Settings: Auto 125-200

Some of my photos under the mentioned situations resulted in ISO250 that was beyond the set range. Mostly, it happened when exposing a rather strong light.

How did this happen....ISO going beyond the set values?

A similar test was done using K-01 (Av f/2.8, D-Range: Auto, ISO Settings: Auto 100-200). The result was the other around. Upon approching a rather strong light, the ISO became smaller (as it should be).

Can anyone explain what happens to the Q?

Regards,

Joe

03-22-2012, 08:29 PM   #2
Administrator
Site Webmaster
Adam's Avatar

Join Date: Sep 2006
Location: Arizona
Photos: Gallery | Albums
Posts: 40,978
It's because you had D-Range set to On on you Q. This doubles the ISO used.

On the K-01, they added an auto option which will honor your ISO range (and conversely not enable itself as often when there's less light).

Adam
PentaxForums.com Webmaster (Site Usage Guide | Site Help | My Photography)



PentaxForums.com's high server and development costs are user-supported. You can help cover those costs by donating. Or, buy your photo gear from our affiliates, Adorama, B&H Photo, or Topaz Labs, and get FREE Marketplace access - click here to see how! Trusted Pentax retailers:

03-22-2012, 08:59 PM   #3
Inactive Account




Join Date: Feb 2012
Photos: Gallery
Posts: 24
Original Poster
D-Range Mode => Auto

QuoteOriginally posted by Adam Quote
It's because you had D-Range set to On on you Q. This doubles the ISO used.

On the K-01, they added an auto option which will honor your ISO range (and conversely not enable itself as often when there's less light).
Adam, thanks for your quick reply.

However, the D-Range Mode was set "Auto" on the Q I was using. The same setting for D-Range for both the Q & the K-01 ("Auto").

Joe
03-22-2012, 09:40 PM   #4
Site Supporter




Join Date: Sep 2006
Location: midwest, United States
Photos: Gallery
Posts: 3,225
The K-01 has a greater dyamic range capability than the Q sensor. Perhaps the K-01 decided it didn't need dynamic range expansion but the Q knew it did and used it. For dynamic range enhancement to work the Iso has to be doubled. You set the Q up for two conflicting commands. Perhaps it went with the setting most likely to capture a decent picture. You could probably avoid this by raisng the auto ISO range to at least allow 250. It is only 1\3 f a step higher.Minimum ISO on K-01 is lowr at 100.
thanks
barondla

03-23-2012, 09:52 AM   #5
Inactive Account




Join Date: Feb 2012
Photos: Gallery
Posts: 24
Original Poster
Thanks...

QuoteOriginally posted by barondla Quote
The K-01 has a greater dyamic range capability than the Q sensor. Perhaps the K-01 decided it didn't need dynamic range expansion but the Q knew it did and used it. For dynamic range enhancement to work the Iso has to be doubled. You set the Q up for two conflicting commands. Perhaps it went with the setting most likely to capture a decent picture. You could probably avoid this by raisng the auto ISO range to at least allow 250. It is only 1\3 f a step higher.Minimum ISO on K-01 is lowr at 100.
thanks
barondla
I tried it again. You're right. Even though the D-Range mode is kept "On" on the Q, it seems the Q prefer expansion over the auto ISO range.

Joe
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!
auto, camera, d-range, iso, light, mirrorless, pentax q, pentax q10, pentax q7, q10, q7, settings, situations
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
ISO settings HarryK Troubleshooting and Beginner Help 11 12-04-2011 11:12 PM
ISO settings strikes Troubleshooting and Beginner Help 5 09-17-2011 03:43 PM
K5 ISO settings for birding. ramiot Pentax K-5 13 08-19-2011 05:59 AM
K-x: What is your iso settings? yusuf Pentax DSLR Discussion 32 04-25-2010 02:19 PM
ISO Settings Fl_Gulfer Pentax Film SLR Discussion 13 08-05-2008 11:50 AM



All times are GMT -7. The time now is 02:04 AM. | See also: NikonForums.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