Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
04-30-2013, 03:20 PM   #1
Junior Member




Join Date: Sep 2012
Posts: 34
Using Bulb Mode on K5

Just curious if anyone had any advice on using the Bulb mode on the K5. I was hoping to try and get some star shots but I have never used it.

04-30-2013, 03:46 PM   #2
Site Supporter
jatrax's Avatar

Join Date: May 2010
Location: Oregon
Photos: Gallery | Albums
Posts: 10,749
There is a setting in the menu that determines whether the remote operates as: press to open shutter / press again to close shutter OR press and hold remote button and release when you want to close the shutter. Set this as you prefer.

Not much other advice, except have fun.
04-30-2013, 04:13 PM   #3
Veteran Member
kcobain1992's Avatar

Join Date: Dec 2010
Location: Bucharest, Romania
Photos: Gallery
Posts: 1,409
Hi, for long exposures, you need a sturdy tripod, a remote control and a lot of patience Basically, for anything longer than 30 seconds, the camera automatically takes another picture of same length, but shutter closed, so it gets a black frame, but with the same noise pattern. Then it subtracts the noise from the first picture and you get a clean frame. This is called dark frame subtraction and can take a lot of time, so the K-5 also has the option of bypassing it (it's called slow shutter noise reduction in the menu, I believe), but at the cost of getting slightly noisier pictures. It's your choice
04-30-2013, 04:19 PM   #4
Site Supporter
JimJohnson's Avatar

Join Date: Jan 2012
Location: Lake Superior - Michigan
Photos: Gallery
Posts: 2,266
Dark Field Extraction .... when you take a long exposure, the camera by default will take an equally long exposure with the shutter closed. The camera can then identify any pixels that show exposure when they shouldn't and use that data to subtract those pixels from the exposed image. The goal is to reduce noise. There are lots of posts in this Forum where photographers didn't realize this and thought their camera had died.

05-01-2013, 01:57 AM   #5
Site Supporter
AussieTrev's Avatar

Join Date: Jul 2010
Location: Queensland
Photos: Gallery | Albums
Posts: 3,245
If you set the long exposure shutter mode to one press to open and one to close you can use the infrared remote to operate the shutter which removes any chance of shake. Also experiment with mirror up, which is another menu choose, this is another area of camera shake. Also turn noise reduction off, it just takes too long and use a noise reduction plug in for Lightroom, Aperture or Photoshop. I use both Topaz and Nik Software and either use one or the other or both.
10-01-2013, 05:35 PM   #6
Senior Member
em-tx's Avatar

Join Date: Jul 2012
Posts: 206
QuoteOriginally posted by AussieTrev Quote
If you set the long exposure shutter mode to one press to open and one to close you can use the infrared remote to operate the shutter which removes any chance of shake. Also experiment with mirror up, which is another menu choose, this is another area of camera shake. Also turn noise reduction off, it just takes too long and use a noise reduction plug in for Lightroom, Aperture or Photoshop. I use both Topaz and Nik Software and either use one or the other or both.
Hi, I was wondering about mirror lock up. I looked up in menu and it seems to me connected with sensor cleaning which is moment I can not take a pictures. Can you please share how to work out mirror lock up? Thank you.
10-01-2013, 07:14 PM   #7
Site Supporter
JimJohnson's Avatar

Join Date: Jan 2012
Location: Lake Superior - Michigan
Photos: Gallery
Posts: 2,266
The K-5 may have an actual mirror lock-up for exposure function (as opposed to locking it up for sensor cleaning), I don't know. On the other hand, the entire line of current Pentax dSLRs has a short self-timer function. The purpose is to lift the mirror and keep it up a couple seconds prior to activating the shutter. This is supposedly enough to dampen normal camera movement during the exposure.
10-01-2013, 07:59 PM   #8
Site Supporter
jatrax's Avatar

Join Date: May 2010
Location: Oregon
Photos: Gallery | Albums
Posts: 10,749
K-5 has true "mirror up" it is under the drive mode button. When set first press of the shutter button lifts the mirror and second press takes the exposure. It can be set to use a remote or the shutter button.

10-02-2013, 04:43 AM   #9
Senior Member




Join Date: Mar 2012
Photos: Gallery
Posts: 165
i use irremote with 3sec delay much. When press remotecontrol button mirror is locked up and after 3sec shitter is opened automatically. in bulb mode shutter is open as long as i press remotecontrol button again. no cable causing camerashake with irremote. highly recomended to get cheap one button pentax ir remote. i not use my cable remote anymore, no need to openclose rubberdoor in body anymore, i cound not do that when using L-plate anyway...
10-02-2013, 03:22 PM   #10
Site Supporter




Join Date: Mar 2008
Location: Prince George, BC
Photos: Gallery
Posts: 2,324
I use IR remote and mirror lockup with first press and shutter open on second press for astrophoto work. The only way to ensure all vibrations have damped down before activating shutter. It may take more than 3 seconds at times.

Jack
10-03-2013, 04:43 AM   #11
Senior Member




Join Date: Mar 2012
Photos: Gallery
Posts: 165
Jack, how many secs delay is needed to make 100% sure there is no shake left anymore?
10-03-2013, 04:21 PM   #12
Site Supporter




Join Date: Mar 2008
Location: Prince George, BC
Photos: Gallery
Posts: 2,324
Many factors will determine that: tripod stability, wind speed, tripod head, camera mount, bumping the whole setup (this happens more often than you would think). Trial and error will be your guide. I rarely need to wait more than 5 seconds with my setup.

Jack
10-04-2013, 01:30 AM   #13
Veteran Member
Barry Pearson's Avatar

Join Date: Jul 2013
Location: Stockport
Posts: 870
QuoteOriginally posted by 123jippo Quote
Jack, how many secs delay is needed to make 100% sure there is no shake left anymore?
QuoteOriginally posted by jbinpg Quote
Many factors will determine that: tripod stability, wind speed, tripod head, camera mount, bumping the whole setup (this happens more often than you would think). Trial and error will be your guide. I rarely need to wait more than 5 seconds with my setup.
I often rely on the standard 2-second delay, after firing by hand. But I know professionals who think it should be much longer. (And I use an IR or cable release where convenient).

But trial and error can be tricky. After all, if wind is a factor while waiting for the shot to start, it is still a factor while the exposure is being made.
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!
bulb, bulb mode, camera, dslr, k-5, k-5 ii, k-5 iis, k5, mode, pentax k-5
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
K-R Locks up in bulb mode on longer shots jostafew Troubleshooting and Beginner Help 3 09-08-2012 10:59 AM
Bulb Mode- nr on topside LED after long exposure seachunk2 Troubleshooting and Beginner Help 3 08-21-2012 02:10 PM
K20D will only expose for 0.6 seconds in bulb mode using cheap IR remote fuent104 Pentax DSLR Discussion 4 02-10-2012 08:44 PM
Bulb Mode Problem on K-x krp Troubleshooting and Beginner Help 12 07-15-2011 12:41 AM
Bulb mode on K200D and very long exposure madbrain Pentax DSLR Discussion 34 07-31-2008 01:06 PM



All times are GMT -7. The time now is 07:43 AM. | 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