Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
09-14-2008, 03:27 PM   #1
Pentaxian
eccs19's Avatar

Join Date: Jul 2008
Location: Lisle, Ontario
Photos: Gallery
Posts: 1,458
Question regarding full manual mode.

I've been playing around with my 50mm lens. It's a full manual lens. I was using it today, and was using the flash with it as well. One issue I ran into was.... When I pop the flash (built in flash) on my *ist D, the camera doesn't seem to adjust the exposure time, so flash goes off, but still long shutter time, and therefore blurry shots. Is this just something I have to live with in full manual mode with this lens, or have I just missed something simple?

09-14-2008, 03:57 PM   #2
Veteran Member
inferno10's Avatar

Join Date: Feb 2007
Location: San Francisco, California
Posts: 342
If I recall correctly, the camera will not operate the flash in P-TTL mode with a manual lens since it cannot communicate with the lens. Therefore, you'll have to adjust the aperture and/or exposure manually.
09-14-2008, 05:51 PM   #3
Pentaxian
Marc Sabatella's Avatar

Join Date: Sep 2006
Location: Denver, CO
Photos: Gallery
Posts: 10,686
QuoteOriginally posted by eccs19 Quote
I've been playing around with my 50mm lens. It's a full manual lens. I was using it today, and was using the flash with it as well. One issue I ran into was.... When I pop the flash (built in flash) on my *ist D, the camera doesn't seem to adjust the exposure time, so flash goes off, but still long shutter time, and therefore blurry shots. Is this just something I have to live with in full manual mode with this lens, or have I just missed something simple?
On fully manual lens, the camera never adjusts anything - it's all up to you, using M mode. If you chose too slow a shutter speed, that's up to *you* to change, not the camera.

But actually, shutter speed is largely irrelevant for most flash shots - the flash is *much* shorter than the shutter. So I don't see how you could have gotten blur from too slow a shutter, unless you had it set so slow that ambient light was able to ight up the scene. The solution is simple - turn up the shutter speed. You're in "M" , just turn the dial.

But the other problem with flash on manual lenses is as mentioned above - the camera will always fire the flash full power with manual lenses. Meaning the exposure is completely dependent on the distance to subject and the aperture & ISO. Do a search on the phrase "guide number" to learn how to set an appropriate aperture & ISO for the subject distance. If the shot you got wasn't horribly overexposed or underexposed, you basically just got lucky and happened to be at a reasonable aperture & ISO for the subject distance.
09-14-2008, 08:57 PM   #4
Loyal Site Supporter
Canada_Rockies's Avatar

Join Date: Nov 2007
Location: Sparwood, BC, Canada
Photos: Gallery | Albums
Posts: 9,134
The camera cannot tell the flash what to do, nor can the flash determine what the camera is thinking when a lens not capable of "A" auto aperture is used. The solution is to use the guide number of the flash (11? 13?) and set the camera to X synchronization, which sets the maximum shutter speed at which the shutter curtains are both clear of the sensor. Then the flash well be providing most of the light.

09-14-2008, 09:45 PM   #5
Ole
Administrator
Ole's Avatar

Join Date: Sep 2006
Location: Copenhagen, Denmark
Photos: Gallery | Albums
Posts: 3,783
The *istD has TTL flash metering and therefore works perfectly well with manual lenses. Marc above is thus wrong when writing that the flash will always fire at full strength. It will not - it will only emit the necessary amount of light.

What shutterspeed you get depends on the exposure mode you're in. If *you* want to decide the shutterspeed, use M (manual exposure) mode and set the shutter to e.g. 1/125. In other modes you may get a slow speed as the camera tries to also get the background exposed correctly based on available light.

Last edited by Ole; 09-14-2008 at 10:22 PM.
09-15-2008, 02:52 PM   #6
Pentaxian
Marc Sabatella's Avatar

Join Date: Sep 2006
Location: Denver, CO
Photos: Gallery
Posts: 10,686
QuoteOriginally posted by Ole Quote
The *istD has TTL flash metering and therefore works perfectly well with manual lenses. Marc above is thus wrong when writing that the flash will always fire at full strength.
Thanks for the correction. The DS also supports TTL, but only for *external* flashes, and I didn't realize the D was different in this way.
09-15-2008, 02:55 PM   #7
Pentaxian
Lowell Goudge's Avatar

Join Date: Jan 2007
Location: Toronto
Photos: Gallery | Albums
Posts: 15,312
QuoteOriginally posted by eccs19 Quote
I've been playing around with my 50mm lens. It's a full manual lens. I was using it today, and was using the flash with it as well. One issue I ran into was.... When I pop the flash (built in flash) on my *ist D, the camera doesn't seem to adjust the exposure time, so flash goes off, but still long shutter time, and therefore blurry shots. Is this just something I have to live with in full manual mode with this lens, or have I just missed something simple?
It really depends on how you approach flash photography.

I generally (for flash) set my camera to 1/150, and let flash do all the work. This insures that the camera does not set (with green button metering) a long shutter to copensate for low light.
09-16-2008, 04:21 AM   #8
Pentaxian
eccs19's Avatar

Join Date: Jul 2008
Location: Lisle, Ontario
Photos: Gallery
Posts: 1,458
Original Poster
Thanks for everyone input.

I tried your suggestion last night (I actually selected 1/125 by mistake), but it did seem to work. Thanks for the tip.

QuoteOriginally posted by Lowell Goudge Quote
It really depends on how you approach flash photography.

I generally (for flash) set my camera to 1/150, and let flash do all the work. This insures that the camera does not set (with green button metering) a long shutter to copensate for low light.


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!
camera, dslr, flash, lens, photography, time
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Maybe An Email Camapign To Persuade Pentax To Give Us Full Manual Video Mode Christopher M.W.T Video and Pentax HDSLRs 136 03-24-2010 10:48 AM
Beginner question about manual mode DSLRnoob Troubleshooting and Beginner Help 7 01-30-2010 05:03 PM
Is there any known official reason why the K7 Didn't Have Full Manual Video Mode? Christopher M.W.T Pentax DSLR Discussion 4 08-24-2009 06:57 AM
Full Manual Mode - How can I get better? Kornbread Photographic Technique 78 08-08-2009 03:50 PM
K100ds and full manual mode w/manual lens dwhopson Pentax DSLR Discussion 10 11-06-2008 10:37 PM



All times are GMT -7. The time now is 01:42 PM. | See also: NikonForums.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