Forgot Password
Pentax Camera Forums Home

Show Printable Version Search this Thread
02-02-2012, 08:24 PM   #1
Site Supporter

Join Date: Apr 2011
Location: Oklahoma
Posts: 309
Problem with a Sigma EF-610 DG ST

Hello all,

I have recently started having problems with a Sigma EF-610 DG ST and my K-x. I have the following issues, which may be symptoms of one problem or multiple problems. I don't know, so I am coming here! I usually shoot in Apeture Priority mode.

1) The flash often will not zoom to the correct focal length.
2) The camera doesn't seem to be taking the flash's light output, leaving pictures way overexposed.

The only way I have found to solve the first issue is to turn the camera on after I turned the flash on. It used to not matter. The second issue I have found no solution for. I am quite confused and need some help. Thanks for reading!

02-02-2012, 08:25 PM   #2
Site Supporter

Join Date: Apr 2011
Location: Oklahoma
Posts: 309
Original Poster
Oh one more important piece of information - the Sigma flash is for Pentax cameras, so it is supposed to talk P-TTL.
02-08-2012, 11:40 PM - 1 Like   #3
Veteran Member
sterretje's Avatar

Join Date: Dec 2008
Location: Roodepoort, South Africa
Photos: Gallery | Albums
Posts: 3,561
I don't have this flash so can't really help.

The fact that it blasts full power indicates that it is not in pTTL mode. If the flash does not have an indication of the mode, you can check using the 2s delay: in pTTL it should give a pTTL pre-flash when you fully press the shutter and another flash 2 seconds later when the actual picture is taken.

Do the same exercise with the built-in flash. If the results are different, it indicates a camera / flash communication problem. If the results are the same (no pTTL), it indicates a camera or camera / lens communication 'problem'.

What lens do you use when this happens? Are you using M42/K/M lens when this happens? If so, pTTL does indeed not work (see page 162 of the camera manual).

FYI: The manual of a AF540 states to switch the flash on first and the camera next.
02-10-2012, 10:24 AM   #4
Site Supporter

Join Date: Apr 2011
Location: Oklahoma
Posts: 309
Original Poster
Thank you, I will try that and report back.


  • 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, dg, ef-610, flash, issue, lighting, photo studio, sigma, sigma ef-610 dg, st, strobist
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Similar Threads
Thread Thread Starter Forum Replies Last Post
Metz 50 vs Sigma EF 610 Super cali92rs Flashes, Lighting, and Studio 7 10-31-2011 04:56 AM
Sigma EF-610 DG ST mattb123 Pentax Camera and Field Accessories 11 09-08-2011 05:41 AM
Sigma 610 flash wireless mode ChopperCharles Flashes, Lighting, and Studio 8 05-11-2011 08:24 AM
Flash: Metz 50 AF-1 or Sigma DG- 610 Super taiweitai Flashes, Lighting, and Studio 12 05-01-2011 02:11 AM
Inexpensive flash (Sigma EF 610-DG ST or better?) jmbower Flashes, Lighting, and Studio 8 02-25-2011 01:57 PM

All times are GMT -7. The time now is 11:35 PM. | See also:, 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?
Creating a FREE ACCOUNT takes under a minute, removes ads, and lets you post! [Dismiss]