Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
02-22-2007, 10:11 AM   #1
Pentaxian
fevbusch's Avatar

Join Date: Jan 2007
Location: Brooklyn, New York
Photos: Gallery | Albums
Posts: 1,070
AE-L exposure lock stopping down

On my K100D. When using my Sigma 50mm 2.8 lens I stop down after every shot by pressing the AE-L lock, after getting my focus. It also stops the camera from Hunting and I think gives me better depth of field.
While glancing thru the k100d manual I noticed that they say after locking the AE-L you have to hit it again to unlock it after the shot.
Should I be doing that. After all I'm taking many shots at different focuses and I don't think it should stay locked when I'm doing that. What do you advise. Fred

02-22-2007, 11:58 AM   #2
Veteran Member
*isteve's Avatar

Join Date: Nov 2006
Location: London, England
Posts: 1,187
QuoteOriginally posted by fevbusch Quote
On my K100D. When using my Sigma 50mm 2.8 lens I stop down after every shot by pressing the AE-L lock, after getting my focus. It also stops the camera from Hunting and I think gives me better depth of field.
While glancing thru the k100d manual I noticed that they say after locking the AE-L you have to hit it again to unlock it after the shot.
Should I be doing that. After all I'm taking many shots at different focuses and I don't think it should stay locked when I'm doing that. What do you advise. Fred
AE-L does not stop down the lens. It just freezes the exposure reading for however many seconds it says in the metering timer setting. It means you can recompose the shot and refocus without changing the exposure.
02-22-2007, 12:51 PM   #3
Senior Member




Join Date: Feb 2007
Location: Saskatchewan, Canada
Posts: 106
I find the AE-L to be of dubious value. Every time I've tried to use it for the purposes of taking a bunch of shots to stitch together in a panorama, it has expired before the sequence of images are taken. I know the timer can be adjusted but it's easier to just set the camera to Manual.
02-22-2007, 01:02 PM   #4
Pentaxian
fevbusch's Avatar

Join Date: Jan 2007
Location: Brooklyn, New York
Photos: Gallery | Albums
Posts: 1,070
Original Poster
So, Steve, how do I stop down the lens. Somebody once said to move the on off switch of the camera to the "aperture symbol. But when I did that the camera instantly took the picture. Is it supposed to do that? Freddy

02-24-2007, 07:00 PM   #5
Veteran Member




Join Date: Sep 2006
Location: Göteborg, Sweden
Posts: 810
QuoteOriginally posted by fevbusch Quote
On my K100D. When using my Sigma 50mm 2.8 lens I stop down after every shot by pressing the AE-L lock, after getting my focus. It also stops the camera from Hunting and I think gives me better depth of field.
While glancing thru the k100d manual I noticed that they say after locking the AE-L you have to hit it again to unlock it after the shot.
Should I be doing that. After all I'm taking many shots at different focuses and I don't think it should stay locked when I'm doing that. What do you advise. Fred
Hi Fred,

If I read your post correctly there are some misunderstandings here:

QuoteQuote:
I stop down after every shot by pressing the AE-L lock, after getting my focus.
I interprete this as you you aim, focus and get focus and then press the AE-L button. If that is correct you have now the target at the right place and focused. By pressing the AE-L button you also have told the camera to lock the exposure at the values showed in the viewfinder bottom, where a * also is shown now. This doesn't mean you have stopped your lens down. That will happen automatically when you press the trigger, the f-value read in the viewfinder is now locked and the camera stops down and lifts the mirror and opens the shutter the time shown in the viewfinder.

QuoteQuote:
It also stops the camera from Hunting and I think gives me better depth of field.
Hmm... The focus is locked when it is locked. Fixating the exposure values does nothing here. If your camera is set to continues focusing it tries to focus all the time, if it is set to one shot mode it stays where it is as long as you keep the trigger hal pressed.
The depth of field is determined by the aperture opening (presuming you don't move and refocus and zoom (hard with the Sigma) and all that). You check the DOF) loosely at least) by moving the ON-OFF switch to the aperture symbol. You can set the camera to Aperture priority mode and change the aperture with the thumb wheel checking the DOF. When satisfied you know what aperture you want to use. If you have locked the exposure value with the AE-L button you can use the thumb wheel and alter the aperture opening til' you get the value you want (the camera will change the shutter time accordingly not to alter the exposure value (at least with the DS)). Again, the aperture opening determines the DOF and exactly when the lens is stopped down doesn't matter: before taking the picture or not will make no difference as the lens will get stopped down anyway the moment you press the trigger all the way down.

QuoteQuote:
While glancing thru the k100d manual I noticed that they say after locking the AE-L you have to hit it again to unlock it after the shot.
I think they mean you have to press it again to release the camera from the previous order you gave it. When you press the AE-L button the exposure value will be locked, and stay locked as per Steve's reply.

In practise this means you have the camera set to the same exposure value (shutter time and aperture) until you press the AE-L button once again (or the metering time runs out).

This is good if you want to take several pictures of one subject and the light hasn't changed between the shots. If the light changes, or you walk away and decides to take a picture of something else, you can release the meter and let it do it's job again. Your choice.


QuoteQuote:
Should I be doing that. After all I'm taking many shots at different focuses and I don't think it should stay locked when I'm doing that. What do you advise.
If take several pictures of something and want to change the focus only a bit between these pictures you should let the exposure value stay locked. Concentrate upon focusing and rest assured that the exposure will be correct as you allready have measured the light when taking the first picture. Why shouldn't the exposure value be locked?



From the last reply:
QuoteQuote:
So, Steve, how do I stop down the lens. Somebody once said to move the on off switch of the camera to the "aperture symbol. But when I did that the camera instantly took the picture. Is it supposed to do that?
The camera stops the lens down, when taking the picture. If you mean to check the DOF you should turn that ON-OFF switch to the aperture symbol as allready discussed. The camera is not supposed to take a picture because you do that. I guess you pressed the trigger by accident if that happened.

Are you talking macros here? If so I think you should turn the camera to manual focusing. That way you don't have to bother with the trigger and hunting and all that stuff. You can focus, lock the exposure, check the DOF, choose aperture and refocuse til' you are satisfied. I sometimes justtouch the trigger to reactivate the meter so the time doesn't run away from me. Or go to manual exposure alltogehter, determine the exposure and then fiddle with focusing. Then you have to change the shutter time accordingly if you change the aperture value, naturalmente)

A long post... please report back if I misunderstood anything here.
02-24-2007, 09:25 PM   #6
Veteran Member
borno's Avatar

Join Date: Nov 2006
Location: md-usa
Photos: Gallery | Albums
Posts: 2,580
hi fred,
If the k100 is like the k10, the aperture symbol on the on-off switch will take a sample shot for preview unless you set it for optical preview in the menu. That will stop down the lens and let you check depth of field (my eyes aren't good enough for that anymore!) . Hope this helps.
tom b.
02-24-2007, 09:39 PM   #7
Veteran Member




Join Date: Sep 2006
Location: Göteborg, Sweden
Posts: 810
QuoteOriginally posted by borno Quote
hi fred,
If the k100 is like the k10, the aperture symbol on the on-off switch will take a sample shot for preview unless you set it for optical preview in the menu. That will stop down the lens and let you check depth of field (my eyes aren't good enough for that anymore!) . Hope this helps.
tom b.
Thank you for clearing up that part. With the DS I'm not used to that digital preview thing.
02-26-2007, 06:18 PM   #8
Veteran Member




Join Date: Oct 2006
Location: Albuquerque, NM
Photos: Gallery | Albums
Posts: 309
QuoteOriginally posted by Tom Brown Quote
I find the AE-L to be of dubious value. Every time I've tried to use it for the purposes of taking a bunch of shots to stitch together in a panorama, it has expired before the sequence of images are taken. I know the timer can be adjusted but it's easier to just set the camera to Manual.
Hi Tom. I agree for a panorama, manual mode makes the most sense. But the AE-L button has other uses. Two situations I use it for are:

* locking the exposure after setting it with spot metering

* locking the exposure when small changes in framing cause significant changes in exposure (e.g. bright sky at sunset with lots of foreground in the shadows)

Both of these are variants of 'recompose & shoot' that Steve noted.

-Mark

03-02-2007, 12:15 PM   #9
Senior Member
atnbirdie's Avatar

Join Date: Feb 2007
Location: Maryland
Photos: Gallery
Posts: 121
DOF Setting

Don't forget that you have to change the default way the K100D displays the DOF preview. By default, when you push the power switch past "ON", it shows the DOF preview on the LCD (digital preview) using volatile memory (ie., nothing is stored on your card). To make the DOF preview work in your viewfinder (optical; my preference), you have to go into the Custom Settings menu and change the setting from digital to optical.
When in doubt, pull out the manual (p.152) :-)
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!
ae-l, camera, dslr, k100d, photography, shot
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Exposure lock with half press - K7 Yale Quan Pentax DSLR Discussion 3 03-28-2011 07:47 PM
Stopping down fekish Troubleshooting and Beginner Help 21 10-08-2010 01:24 AM
Focus and Exposure lock? BethC Pentax DSLR Discussion 10 04-15-2010 03:39 PM
Exposure lock - problem solving question maxmagnum Troubleshooting and Beginner Help 6 12-23-2009 11:47 PM
Exposure Lock pdangcil Video and Pentax HDSLRs 2 12-20-2009 10:33 PM



All times are GMT -7. The time now is 08:44 PM. | 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