Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
12-28-2009, 10:53 AM   #1
Senior Member




Join Date: Dec 2009
Posts: 106
Kx (or K7) Controlling shutter speed?

What techniques are there for holding the shutter speed constant at, say, 1/60th, if the lighting conditions are changeable? Thanks.

12-28-2009, 11:37 AM   #2
Veteran Member




Join Date: Jan 2008
Location: Ste-Anne des Plaines, Qc., Canada
Posts: 2,014
You can always use Tv. It will keep the shutter speed where you put it. It will change aperture and ISO if your camera is set on Auto ISO.
12-28-2009, 11:47 AM   #3
Banned




Join Date: Sep 2006
Location: Millstone,NJ
Posts: 6,491
QuoteOriginally posted by flyer Quote
You can always use Tv. It will keep the shutter speed where you put it. It will change aperture and ISO if your camera is set on Auto ISO.
In video mode ?
12-28-2009, 11:52 AM   #4
Senior Member




Join Date: Dec 2009
Posts: 106
Original Poster
Yep - sorry if I wasn't clear - I'm meaning while in video mode.

12-28-2009, 02:58 PM   #5
Senior Member
netrex's Avatar

Join Date: Apr 2009
Location: Alta
Photos: Gallery | Albums
Posts: 279
How will this be possible on the K-x where you have to choose the video camera icon on the mode dial (where Tv is also).
12-28-2009, 03:14 PM   #6
Veteran Member
Eruditass's Avatar

Join Date: Jul 2009
Location: Pittsburgh, PA
Photos: Gallery | Albums
Posts: 2,206
You can't, unfortunately, you only get Av mode.

Only thing you can do is lock exposure once you get a shutter speed you like.
12-28-2009, 04:41 PM   #7
Banned




Join Date: Sep 2006
Location: Millstone,NJ
Posts: 6,491
QuoteOriginally posted by Eruditass Quote
You can't, unfortunately, you only get Av mode.

Only thing you can do is lock exposure once you get a shutter speed you like.
How do you know what the shutter speed is in video mode ?
12-28-2009, 04:55 PM   #8
Veteran Member




Join Date: Jan 2008
Location: Ste-Anne des Plaines, Qc., Canada
Posts: 2,014
QuoteOriginally posted by jogiba Quote
In video mode ?
It's nice of you to wake me up after such a stupid answer.

I guess I need to catch up on sleep.

12-28-2009, 05:03 PM   #9
Senior Member




Join Date: Dec 2009
Posts: 106
Original Poster
So you can lock exposure? That's good to know - the DP review that just came out seemed to imply that you could only lock aperture, and that gain and shutterspeed would continue to fluctuate.
12-28-2009, 06:42 PM   #10
Banned




Join Date: Sep 2006
Location: Millstone,NJ
Posts: 6,491
AE-L fix on the KX:
[yt]http://www.youtube.com/watch?v=68AQzJE1tdI[/yt]
12-28-2009, 10:02 PM   #11
Senior Member




Join Date: Dec 2009
Posts: 106
Original Poster
Thanks for that - no mention of AE-L whatsoever in the video section of DPReview, and dire warnings about exposure changing during shots, so they apparently missed that feature.

But ... any way to determine what shutter speed the camera is being locked to with AE-L?
12-29-2009, 01:21 AM   #12
Senior Member
netrex's Avatar

Join Date: Apr 2009
Location: Alta
Photos: Gallery | Albums
Posts: 279
I hope they fix manual control. Filming with the wrong shutterspeed with certain lights make everything flicker and look really bad, so it will pretty much be useless in those cases unless you're lucky and get the right shutter speed by chance.
12-29-2009, 04:54 AM   #13
Veteran Member
falconeye's Avatar

Join Date: Jan 2008
Location: Munich, Alps, Germany
Photos: Gallery
Posts: 6,863
QuoteOriginally posted by Coby Quote
But ... any way to determine what shutter speed the camera is being locked to with AE-L?
Back in June, I compiled a chart for the K-7:

Falk Lumo: K-7 as a movie camera -- PART II: Controlling video recording

The K-x should be similiar (except that with 24fps, it should target less than 1/30s -- also, I assume that K-x won't use extended ISO even when enabled and I am not sure if it would use ISO 6400 -- do your own tests and report back). The chart was compiled by observing that the same exposure (in EV terms) is used in video and still LV mode and by observing where the video controls started blinking red.
12-29-2009, 10:42 AM   #14
Senior Member




Join Date: Dec 2009
Posts: 106
Original Poster
Falk, Thank you very much for that link - that chart is exactly what I was hoping might be available. It's encouraging that there is a fairly wide EV range where the K7 maintains a sensible (low) shutter speed - and that it will respond well to ND filters. Some of the K7/Kx footage I've seen online uses way too high a speed in bright light and looks bad.

I bit the bullet last night and ordered a Kx, and will attempt an equivalent EV chart for that camera ....
12-29-2009, 11:01 AM   #15
Veteran Member
falconeye's Avatar

Join Date: Jan 2008
Location: Munich, Alps, Germany
Photos: Gallery
Posts: 6,863
QuoteOriginally posted by Coby Quote
I bit the bullet last night and ordered a Kx, and will attempt an equivalent EV chart for that camera ....
Great, I'll link back to your work then.

If you feel tempted to measure the exact exposure time (I only estimated it) then it is easiest to film a flickering source, pan horizontally and count ghost images looking at a single frame. Some high end audio devices have nice flickering display Some power "LEDs" do flicker, too. Use blurred still photos (no SR) to gauge.
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!
hdslr, shutter, video
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Shutter speed on K-x CrabShadow Troubleshooting and Beginner Help 7 08-14-2010 06:46 AM
what shutter speed did i use? pete_pf Pentax SLR Lens Discussion 9 10-20-2009 01:45 PM
Shutter Speed comovartia Pentax DSLR Discussion 3 12-20-2008 10:38 AM
Shutter speed?! seymop Pentax DSLR Discussion 4 10-02-2007 07:28 PM
Shutter Speed? ryanmkk Pentax DSLR Discussion 4 11-15-2006 03:27 AM



All times are GMT -7. The time now is 12:24 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