Forgot Password
Pentax Camera Forums Home

Show Printable Version Search this Thread
11-12-2012, 09:47 PM   #1
New Member

Join Date: Nov 2012
Posts: 1
K5-11s (or K5) technical query - B setting

New member with technical query! With camera set on iso 80 or 100 and shutter set on B, if shutter is opened (must be in TOTAL darkness) for say 30 minutes and then released will image be completely black without any noise what so ever (ie not to spoil the subsequent flash exposure)? Also would battery last a reasonable time in this situation? Why I ask is before the days of digital I was photographing insects and birds in free flight. My set up used a manual MX with the camera focal plane shutter locked open on B and a secondary electronically controlled shutter attached to front of lens (this used because of almost negligible shutter lag and better flash sync). All controls obviously had to be preset prior to a high speed flash exposure triggered by an infra red beam. The camera body & lens did have to be ‘blacked out’ in places using insulation tape to keep out any stray light as it was sometimes primed (rear shutter open) for 30 minutes plus. I want to dust off my old equipment (it has been boxed up for far too long) and use a similar set up but with a K5-11s (or possibly K5) body therefore any confirmation, advise or comments (prior to my purchase) would help! I believe that there isn't any maximum time for the B setting, although battery usage is also an unknown at this stage.

11-12-2012, 10:31 PM   #2
Site Webmaster
Adam's Avatar

Join Date: Sep 2006
Location: Arizona
Photos: Gallery | Albums
Posts: 43,644
With slow shutter speed noise reduction enabled, yes, they will be noise-free. Note that the camera needs the same amount of time to process the noise reduction as the actual exposure

Can't comment on how long the battery will last, but you can always get a battery grip or power adapter if you need more juice

Adam Webmaster (Site Usage Guide | Site Help | My Photography)'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:

11-13-2012, 12:02 AM   #3
Veteran Member
Dr_who's Avatar

Join Date: Jun 2009
Location: Edmonton, Alberta, Canada
Photos: Gallery | Albums
Posts: 691
For the K5, and I assume the II, IIs you can turn off the dark frame subtraction and just deal with the noise in post and save yourself the 30 minutes of dark frame subtraction.

  • 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!
battery, body, camera, dslr, flash, k-5, k-5 ii, k-5 iis, k5, lens, pentax k-5, shutter
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Similar Threads
Thread Thread Starter Forum Replies Last Post
Lens compatibility confirmation: Will my MZ-30 lenses work on K5 or K5 II? RachaelJamess Visitors' Center 4 11-22-2012 10:23 AM
K5 series: Milky Way rising and setting timelapse kamayok3 General Talk 2 05-22-2012 07:53 PM
K5 High ISO Noise Reduction Setting daphnejohn Pentax K-5 2 11-06-2011 07:45 PM
K5 custom setting: lens adjustment? skyoftexas Pentax K-5 2 03-09-2011 12:07 PM
The best Monochrome setting in K5? kamayok3 Pentax K-5 7 03-07-2011 07:53 AM

All times are GMT -7. The time now is 04:21 PM. | See also:, 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?
Creating a FREE ACCOUNT takes under a minute, removes ads, and lets you post! [Dismiss]