Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
06-24-2008, 11:10 AM   #1
New Member




Join Date: May 2008
Location: MARYVILLE, TENNESSEE
Photos: Gallery
Posts: 20
Pentax k20 flash question

Hi everybody. i am new to using the k20 and I need some help please. i just upgraded from the k10 and I still love it but I thought I would give this a try. I bought this camera on june 21st and love it. But I have notice that when i am using the aperture mode and the camera is telling me to use the flash, the shutter speed never changes. Forgive me If I don't explain this to well. here is a example. I have the ISO set on AUTO- 100-800. The camera gives me a reading of f8 at 1/30 with the ISO reading at 800. when i pop up the flash unit UP, it still is showing a shutter reading of 1/30 but the ISO has changed to 100. I'm sorry for this being so long. My question is this. Even though the ISO did change due to using the flash, shouldn't the shutter reading have changed too? it stayed at 1/30

Any help wold be great, thanks

06-24-2008, 11:30 AM   #2
Veteran Member




Join Date: Jan 2008
Location: Ste-Anne des Plaines, Qc., Canada
Posts: 2,014
What mode were you using! In most situations, the camerqa will go for the lowest ISO compatible with the situation, taking into account the focal length to keep the image free from movement blur, and still retain as much as ambient light as possible to preserve the "atmosphere". If you put the camera an "Tv", or manual, or"X synch", then you have control of shutter speed. BUT, I noticed that sometime, on "Tv", if I take the shutter speed down to a "long" exposure, IT WON'T GO BACK UP IF I TRY TO COME BACK TO MY ORIGINAL EXPOSURE. When that happens, I have to turn the camera "off", then back "on". Fortunately, it doesn't happen to often. Hopefully, it's a glitch in the firmware that will be corrected with future upgrade.
06-24-2008, 11:31 AM   #3
Senior Member
mk07138's Avatar

Join Date: Mar 2008
Location: Frostburg Maryland
Photos: Gallery | Albums
Posts: 151
I think I have this right but if I'm not someone please correct me. Since the K20 and the K10 use the P-ttl flash system the shutter speed and aperture aren't actually adjusted until the preflash fires when you are taking the picture. When you take your pictures do they come out properly exposed? check the recorded shutter speed and aperture on the info screen in camera after taking the picture and see if they are different than what the camera was saying just before the picture was taken.

Hopefully that makes sense.
06-24-2008, 11:55 AM   #4
New Member




Join Date: May 2008
Location: MARYVILLE, TENNESSEE
Photos: Gallery
Posts: 20
Original Poster
all my test shots have been in the av mode at 28mm and having the ISO set to auto at 100 to800. i was used to seeing the change in the shutter speed when i popped up the flash in my k10 but dont seeing this happening with my k20. even when my camera is telling me i have shutter at1/30 and to use flash, it still gives me the same shutter reading at 1/30 even when the flash pops up. ALWAYS STAYS THE SAME AT 1/30. . is this normal on the k20?

06-24-2008, 12:28 PM   #5
Senior Member
mk07138's Avatar

Join Date: Mar 2008
Location: Frostburg Maryland
Photos: Gallery | Albums
Posts: 151
Ok, just picked up my k20 to play with and noticed once i popped up the flash the shutter speed remained that same regardless of the aperture. But as I panned over various lighted regions in the room my shutter speed did change. and the shutter speed did change when the flash popped up, went from 1/8 to 1/50 with my lens set to 28mm.
06-24-2008, 12:34 PM   #6
New Member




Join Date: May 2008
Location: MARYVILLE, TENNESSEE
Photos: Gallery
Posts: 20
Original Poster
I just panned mine also and it also had changes in the shutter speed. so confusing to me. I guess i worry that seeing the shutter at 1/30 i would have blurry pictures. But all of my shots are nice and clear. THANKS EVERYBODY for your help
06-24-2008, 01:03 PM   #7
Veteran Member
mattdm's Avatar

Join Date: Feb 2007
Location: Boston, MA
Photos: Gallery
Posts: 2,964
QuoteOriginally posted by eddieking Quote
I just panned mine also and it also had changes in the shutter speed. so confusing to me. I guess i worry that seeing the shutter at 1/30 i would have blurry pictures. But all of my shots are nice and clear. THANKS EVERYBODY for your help
The flash duration is much shorter, so that freezes the action, presuming the flash is the primary light source. If there's a lot of ambient light, you can still get blur from a slow shutter speed.

I'd be interested to know how the K20D works in P mode with a flash.

With the K10D (regardless of what you set the program line to in the custom menu), if you have a flash attached and ISO is 400 or higher, you get small apertures (f/8 or so). If the ISO is 320 or lower, it suddenly prefers wide-open apertures (at least, on my f/2.8 prime; not sure what it'd do on a f/1.4). Because of this, I don't use AutoISO when I'm using the flash: too unpredictable.

I normally use P-shift on the front dial and EV+/- on the back, and then Ok-front for ISO, but as I type this I'm thinking that when I use the flash, what I really want to be in is Sv mode.
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, help, iso, k20, love, photography, question, shutter
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Vivitar ring flash with Pentax K20 help. Applianceguy Flashes, Lighting, and Studio 3 06-08-2010 04:05 PM
Basic Pentax K-x, hot-shoe, flash, flash bracket, wireless question MrPetkus Flashes, Lighting, and Studio 5 04-27-2010 10:57 PM
K20 P-TTL question K-9 Pentax DSLR Discussion 8 07-28-2009 04:33 PM
K20 Newbie Photo Question... scorpionbowl Pentax DSLR Discussion 9 07-21-2009 08:01 PM
K200 v K20 question dougiewill Pentax DSLR Discussion 1 01-10-2009 11:04 AM



All times are GMT -7. The time now is 05:26 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