Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
01-28-2010, 09:26 PM   #1
New Member




Join Date: Jan 2010
Posts: 9
Setting Shutter Speed for Video (A How To Guide)

if you guys are anything like me, you've been having a hard time figuring out how to set the shutter speed using the previous posted trick (seen here). after messing around with the camera today, i may have stumbled upon a different method where you can actually LOCK shutter speed IN STILL MODE.

step 1: use a manual lens (will NOT work with kit lens).
step 2: go to "P" (Program Mode) on the dial (the camera will say it's in Av mode.)
step 3: set ISO to 100 *. achieve desired shutter speed by pointing at (or away from) light source.
step 4: press AF/AE-L. the asterisk will appear on the LCD and the settings will be locked.
step 5: go to VIDEO on the dial. the asterisk will still be locked. the shutter speed locked in P mode will be retained.

* make sure it's in ISO100 or the shutter speed will be divided appropriately. (ie: if you're in ISO400 with a 1/200 shutter selected, the ISO will revert to 100 and shutter speed to 1/50 once in video mode.)

notes: it seems there's a limit to how low the shutter speed can go. i don't see much difference between 1/25 and 1/10. maybe there's only a few different speeds that can be selected?

test this out. see if it's right. maybe there's something i missed?

01-28-2010, 09:52 PM   #2
Senior Member




Join Date: Dec 2009
Posts: 106
You da MAN!!!!!! Definitely seems to be working here!!!

One thing - my guess is that you can't force the shutter below 1/24 (or 1/25?) in video mode. But this is a great way to avoid excessively high shutter speeds ... I'll update the link you referred to.
01-28-2010, 10:23 PM   #3
Senior Member




Join Date: Dec 2009
Posts: 106
OK I've been experimenting with a Pentax-A 50mm f1.4. In "A" mode, the trick won't work. If you move the aperture ring onto manual f-stops the trick works, but the lens is permanently at f1.4 (i.e. it doesnt stop down when you switch to Video mode).

BUT ... if you twist the lens mount slightly to deregister the contacts between body and lens you gain mechinical control of the iris and not only does the trick work but it also provides two very good things: 1) you can adjust the iris to obtain the desired shutter speed, and 2) you can continue to adjust exposure up or down after locking the shutter!

Sadly, my newer zooms with no mechanical aperture ring aren't able to be used in this way
01-28-2010, 11:35 PM   #4
New Member




Join Date: Jan 2010
Posts: 9
Original Poster
i wonder if this method can be used to lock in the ISO instead? i mean, if the lowest the shutter speed goes (by default) is 1/24 (or something around that) than, if we're willing to accept that speed, can we instead push the ISO to 6400 and lock it in?

or is the k-x stuck at ISO 100 in video (as previously thought)?

or am i making no sense at all now? will go test.

01-29-2010, 07:47 AM   #5
Senior Member




Join Date: May 2009
Location: Portugal
Posts: 112
You're THE MAN!

I'm anxious to get home and try it!!!
01-29-2010, 08:56 AM   #6
Forum Member




Join Date: May 2009
Posts: 91
Just tried it and it works, so I have to repeat:

YOU'RE THE MAN!!

But there is something I'm not quite sure about.
I made a test, in P mode I chose ISO 100 and a shutter of 1/25. I think that's the slowest shutter possible for video, at least that would be logic.

I lock it and switch to video mode, the exposure stays as locked, just as johnnybodybags pointed out.

So what exactely happens if I now tweak the AV +/- settings?


I made a test while the P settings being locked in video mode, I hit AV button and turned it to -3 and the exposure got darker. I turned it to +3 and it got brighter.


How can it get darker if settings were already at ISO 100 and shutter 1/25??
EDIT: I wrote a wrong conclusion here before, question is: how can it get darker if shutter is not affected by AV +/- ? Is it affected then?


And if it get's brighter with AV +3, it must be due to a higher ISO if 1/25 really is the slowest shutter speed in video mode, right?


(I was using a full manual lens btw, no auto settings possible)

I'm just confused about what tweaking AV +/- really is affecting in camera...

Last edited by karl79; 01-29-2010 at 09:30 AM.
01-29-2010, 09:03 AM   #7
Senior Member




Join Date: Dec 2009
Posts: 106
Kark, my guess is it gets brighter by adding gain - good find! Will need some testing to confirm....
01-29-2010, 09:05 AM   #8
Forum Member




Join Date: May 2009
Posts: 91
QuoteOriginally posted by johnnybodybags Quote
or is the k-x stuck at ISO 100 in video (as previously thought)?

or am i making no sense at all now? will go test.
You do make sense, I'm quite sure the ISO is not locked to ISO 100 regardless of what might have been said.
I'm afraid it'll take some more experimenting before knowing anything for sure, but you brought it a whole step further with your finding already!

01-29-2010, 09:08 AM   #9
Forum Member




Join Date: May 2009
Posts: 91
QuoteOriginally posted by Coby Quote
Kark, my guess is it gets brighter by adding gain
Hey Coby, so what's the difference between increasing ISO and adding gain (except that "gain" sounds a LOT worse )?
I think I'm mixing these two things a bit?

Last edited by karl79; 01-29-2010 at 09:17 AM.
01-29-2010, 09:10 AM   #10
Inactive Account




Join Date: Dec 2009
Location: Madison, WI
Photos: Albums
Posts: 30
Why, oh why, cannot Pentax (or any other DSLR manufacturer, it seems) simply put a "Full Manual" mode on this camera? Where you manually set ISO, aperture, shutter and focus without having to jump through all these silly hoops?

Pentax sold millions of fully-manual K1000s back in the 35mm day, even against competition that was pushing auto everything. I can't imagine it would cost Pentax a dime to have a fully manual program in the firmware of their DSLR line. Why are they so reluctant to offer it as an option?

Or are there really so few of us manual photography/video purists that it isn't worth even that tiny bit of bother?
01-29-2010, 10:27 AM   #11
New Member




Join Date: Jan 2010
Posts: 18
works fine

adjusting AV +/- settings seems to affect shutter speed only. unless you the shutter speed limit, then up goes ISO

AND

in video mode after locking the exposure, you can use 'optical preview' to preview your adjusted aperture to maintain correct exposure

i think

Last edited by brandoniscool; 01-29-2010 at 11:26 AM.
01-29-2010, 10:42 AM   #12
Senior Member




Join Date: Oct 2009
Location: houston
Posts: 165
Nice im glad ive been buying up cheap manual lenses lately!
01-29-2010, 02:20 PM   #13
Junior Member




Join Date: Dec 2009
Location: New York
Posts: 38
QuoteOriginally posted by brandoniscool Quote
in video mode after locking the exposure, you can use 'optical preview' to preview your adjusted aperture to maintain correct exposure

i think
This is quite true. I set the green button to check 'optical preview'. I find it very useful when shooting video to ensure I have the exposure where I want it before I begin recording.
01-29-2010, 03:31 PM   #14
Banned




Join Date: Sep 2006
Location: Millstone,NJ
Posts: 6,491
QuoteQuote:
Step 5: go to VIDEO on the dial. the asterisk will still be locked. the shutter speed locked in P mode will be retained.
I tried my K-7 with 85mm F1.4 Rokinon and the AE-L asterisk is gone when switched to movie mode.
01-29-2010, 10:55 PM   #15
Senior Member




Join Date: Dec 2009
Posts: 106
Hmmm... I was wonderring about the K-7.

Jogiba - did you see 'Av' at step 2? If not try again, with your lens slightly twisted in the mount to decouple the connectors (if there are connectors on that lens).

Karl79 - adding gain and increasing ISO both mean increasing the camera's sensitivity to low light = the same thing, in this context!

Last edited by Coby; 01-29-2010 at 11:06 PM.
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!
asterisk, camera, hdslr, iso, lens, mode, shutter, step, video
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Any portable guide on exposures, shutter speed, aperture? raider Photographic Technique 24 07-08-2016 07:56 PM
Quick Guide to Shutter Speed/Aperture/ISO Copyright Troubleshooting and Beginner Help 3 10-24-2010 12:06 PM
K-x bottom shutter speed setting? olenl Troubleshooting and Beginner Help 3 09-22-2010 11:17 PM
K-X setting for shutter speed fekish Troubleshooting and Beginner Help 6 09-07-2010 03:18 AM
Setting shutter speed on K200 frankknight Troubleshooting and Beginner Help 5 10-27-2009 08:56 AM



All times are GMT -7. The time now is 12:21 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