Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
07-06-2013, 04:52 AM   #1
Site Supporter
ismaelg's Avatar

Join Date: Apr 2009
Location: Puerto Rico
Photos: Gallery
Posts: 952
Is it possible to use manual flash in TAv mode?

Hi,

A previous thread on this was a dead end so let me change the question a bit:
Is it possinble to have manual control of a flash in TAv mode?
More specific, K20D / Pentax AF360 flash combo
I was able to do manual control (1/8 power) once in TAv mode but I can not repeat it. It seems it was a "fortunate error".
Any comments on this?

Thanks,

07-06-2013, 05:20 AM   #2
Site Supporter




Join Date: Jan 2010
Location: Michigan
Photos: Gallery
Posts: 2,082
On the K-01, TAv is selected by using M mode and selecting auto iso.
When I attached the AF360 and selected M mode with fixed iso, the flash would allow selection P-TTL, A, M, SB
Then I selected Auto iso . The flash then only allows P-TTL, SB
07-06-2013, 07:05 AM   #3
Pentaxian
maxfield_photo's Avatar

Join Date: Mar 2011
Location: Cincinnati, OH
Posts: 1,216
I think the 360 doesn't like to function that way by default, but you can force it. The problem is that if the flash is going to contribute significantly to the exposure, say more than 30%, the camera has no way of compensating for it's output. So the camera will try to get the exposure right based on the reflected ambient reading, and then when the flash gets added in you get overexposure by whatever amount the flash is contributing. If you know ahead of time you want a 2:1 ratio you could set the camera tun underexpose by half a stop, but then why not just shoot in manual?

To force the flash to work in manual mode, you can either do as wombat suggests and shoot in manual with auto ISO, or, fool the flash into thinking somehow it's not attached to the camera. Putting electrical tape over the TTL contacts seems to work. then the flash can't tell what mode the camera is in, it just gets the signal to "fire now."
07-09-2013, 11:52 AM   #4
Pentaxian
ScooterMaxi Jim's Avatar

Join Date: Jul 2009
Location: Minnesota
Posts: 1,464
It doesn't make good sense to do anything in auto ISO with flash. You are losing control of a variable, and the camera would not know what you're trying to do. The flash becomes your variable when in use. Best then to set your three camera variables yourself.

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, control, dslr, flash, mode, photography, tav
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Manual mode on my K10D is acting like TAv mode Love my K10D Visitors' Center 9 11-06-2013 11:44 AM
Is it possible to do a manual stroboscopic mode? srn121 Flashes, Lighting, and Studio 3 03-13-2012 05:21 PM
Is Av Shift and/or Tv Shift in TAv Mode possible. robert_s Pentax K-5 3 09-30-2011 09:03 AM
Is it possible to use Nikon flash on K200/K2000? PentHassyKon Flashes, Lighting, and Studio 15 03-21-2009 03:49 PM
Is it possible to use off-camera flash extension cord with AF360 to make it swivel? raider Flashes, Lighting, and Studio 8 10-28-2007 05:38 AM



All times are GMT -7. The time now is 10:18 AM. | 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