Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
12-24-2010, 10:35 AM   #1
New Member




Join Date: Dec 2010
Location: NY
Posts: 21
Flash Blow out?

When I use a manual lens and the pop up flash on the k-x I almost always get a completely white washed pic. Does someone have a good setting for shooting a manual pentax lens with the pop up flash indoors, or is it just not a good idea?

12-24-2010, 10:47 AM   #2
Veteran Member
sterretje's Avatar

Join Date: Dec 2008
Location: Roodepoort, South Africa
Photos: Gallery | Albums
Posts: 3,534
ISO 100, a shutterspeed slower than or equal to 1/180s. Read the camera manual about maximum and minimum distances for flash.

My guess is that your camera goes to ISO6400 or something silly like that trying to achieve a normal exposure.
12-24-2010, 11:02 AM   #3
Ira
Inactive Account




Join Date: Mar 2009
Location: Coral Springs, FL
Photos: Gallery | Albums
Posts: 5,218
Do you have it set for manual ISO?

It might be doing nutty things if you don't and using a manual lens.

Are you shooting in M or Av?
12-24-2010, 11:03 AM   #4
Loyal Site Supporter
Canada_Rockies's Avatar

Join Date: Nov 2007
Location: Sparwood, BC, Canada
Photos: Gallery | Albums
Posts: 9,450
With a manual lens, the flash always fires at full power. The guide number is in the manual for the camera. The guide number for my K10 on board flash is 11 in meters. Here is a short, quick version of what a guide number is and does, and how you use it. The guide number is a measure of how powerful your flash is. The AF540FGZ has a guide number of 54 in meters at ISO 100. If you are metrically challenged, your guide number is 36 in feet at ISO 100. (11 m = 36 ft close enough). I see you are in New York, so I'll use GN 36 in feet for the example.
  1. Make sure that [Using Aperture Ring] is set to [Permitted]. If you don't the lens won't stop down when you release the shutter, and you need to change the aperture to affect the flash effect.
  2. Set the mode dial on the camera to X to select the top shutter speed for flash or M and set any shutter speed lower than 1/180. If you use a shutter speed more than 1/180, one of the shutter curtains will be in the way when the flash goes off, and part of the picture will see no flash.
  3. Change the ISO to 100
  4. Focus on the subject and read the distance off the focus ring scale.
  5. Example: distance = 9 feet. Divide 36 by 9 getting 4.
  6. Set the aperture on the lens to 4

If you cannot get enough flash (not your problem if things are washed out) then you have to change the guide number. The power of a light changes with the square of the distance, so if you change the ISO to 400 (4X) you double the guide number to 72.

I hope this points you in the right direction.

12-24-2010, 11:04 AM   #5
New Member




Join Date: Dec 2010
Location: NY
Posts: 21
Original Poster
Worked great. thanks
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, flash, lens, pentax help, photography, pop
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Will a YN-560 Flash Blow Up My K-x? DaveHolmes Troubleshooting and Beginner Help 18 12-02-2010 10:52 AM
Blow Up benjikan General Talk 11 02-14-2010 09:50 PM
Blow Taff Post Your Photos! 9 03-06-2009 08:53 PM
Before I Blow a $1000.oo Fl_Gulfer Pentax SLR Lens Discussion 16 01-17-2009 12:05 AM
Off Camera Flash: A New Way to Blow Money Mike Cash Flashes, Lighting, and Studio 19 10-11-2007 05:20 AM



All times are GMT -7. The time now is 07:45 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