Originally posted by dizzyfish I was hoping I could use the Wirelesss (optical) capabilities of my Pentax AF360/540 units... I wanted to use a Pentax AF360/540 on the K-70 (the K-70 internal built in flash does not support wireless flash) to trigger the slave(s) Pentax AF360/540.
OK...that is what you have, so that makes sense.
Originally posted by dizzyfish Added to this, I don't want the triggering on-camera flash to contribute to the image (Control mode)
The easiest way to do this is with radio triggers, though PTTL controller will work as described in other comments above.
Originally posted by dizzyfish and I want the slave(s) to be in manual wireless mode (Not the Pentax SL2 manual optical slave mode).
Here is the disconnect ^ ^ ^.
You have two choices for optical slave with your Pentax-brand flashes and only one choice for a non-contributing optical controller:
- Slave 1 (SL1) : This is PTTL wireless that allows a non-contributing controller, but is always PTTL-controlled and never manual. You can apply from - 3 to +1 EV on the slave.
- Slave 2 (SL2) : This is dumb slave mode and should be used with the slave in full manual. To avoid triggering on the pre-flash, the master should be in manual mode as well.
If you want option #1, you may want to set the slave to maximum -3 EV and/or move it further from the subject; from comments above, it appears the flash is too close. If option #2, you can minimize contribution from the master by setting it to 1/256 strength* and using a snoot or other mask to prevent it lighting the subject. Likewise, you apply up to eight stops (1/256) less contribution from an AF-360 FGZII slave. Note that you can use the K-70's built-in flash in manual mode as master for this case.
Remember that your major points of control are the flash intensity, distance from light to subject, aperture, and ISO. Minor points of control might be flash zoom setting, reflectors, shades (including snoot), and filters.
I hope this helps.
Steve
* 1/256 on the AF-360 FGZII and 1/32 (five stops) on the AF-360 FGZ