Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
01-19-2014, 10:27 AM   #1
Site Supporter




Join Date: Nov 2006
Location: Candiac, QC, Canada
Photos: Gallery
Posts: 338
A question about flash.

When I use my K30 with a AF360 flash, I can do it in wireless mode. Now for a simple question, Is the controlling done via radio waves or infrared and what is the range? This is not mentioned in the manuals. Thanks for any hint.

01-19-2014, 10:44 AM   #2
Pentaxian




Join Date: Oct 2006
Location: Chicago suburb, IL, USA
Posts: 1,535
Hi VE2CJW,

P-TTL wireless remote is done with light. IIRC, it goes like this: The camera preflashes and gets information for exposure, then flashes again to relay the exposure information to the wireless remote. The remote flash flashes to confirm that it received the information, then the main flash is triggered in sync with the shutter. The optical sensors are infrared sensitive, so I guess you can say it's done with infrared though.

Scott
01-19-2014, 10:56 AM   #3
Site Supporter




Join Date: Nov 2006
Location: Candiac, QC, Canada
Photos: Gallery
Posts: 338
Original Poster
QuoteOriginally posted by snostorm Quote
Hi VE2CJW,

P-TTL wireless remote is done with light. IIRC, it goes like this: The camera preflashes and gets information for exposure, then flashes again to relay the exposure information to the wireless remote. The remote flash flashes to confirm that it received the information, then the main flash is triggered in sync with the shutter. The optical sensors are infrared sensitive, so I guess you can say it's done with infrared though.

Scott
Thanks Scott.
01-19-2014, 10:48 PM   #4
Veteran Member
sterretje's Avatar

Join Date: Dec 2008
Location: Roodepoort, South Africa
Photos: Gallery | Albums
Posts: 3,534
It uses the built-in flash (or an external flash mounted in the hotshoe) for communication and it's based on light, not radio waves.

I don't think that there is two-way communication but I might be wrong; as far as I know it's the camera side that talks to the remote flash and the remote flash does not talk back.

You can set the flash at the camera side to be a controller only. But some people complain that they can still see the effect of the control flash in the picture. In my opinion this indicates that the camera 'instructs' the remote flash to cut the light off during the exposure. Stupid implementation; the camera could have easily told the flash (before the shutter opens) to emit light for e.g. 1/5000 second.

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!
pentax help, question
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Question about off camera flash wowarning Flashes, Lighting, and Studio 6 10-15-2013 08:32 AM
Question about Sunpak Flash jbarnes1114 Troubleshooting and Beginner Help 4 12-27-2012 08:01 PM
Dumb question about flash unit compatibility GibbyTheMole Flashes, Lighting, and Studio 10 10-04-2012 03:59 PM
Question about K-30 flash eachaglimpse Troubleshooting and Beginner Help 6 09-12-2012 09:49 PM
A question about flash photography. Deni Photographic Technique 20 04-21-2008 11:55 PM



All times are GMT -7. The time now is 09:24 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