Originally posted by mcgregni Lets face it, the really major advantage that we all are crying out for is radio triggering for HSS .... and thats the one thing that neither Cactus (nor any other manual system) can yet offer us!!
Certainly not "
all" of us.
I hardly ever need or want HSS -- stopping action is better performed by using 1/180s and a short flash duration -- so more convenient HSS usage would only be a slight bonus for me, but the HSS sympathy mode worked just fine for the few cases I've needed it.
BTW, the Acon triggers should give you HSS through radio. No manual control of groups -- as it is just a radio version of P-TTL, so its useless to me -- but maybe it is what you want.
Originally posted by mcgregni Its the bright light that causes the problems for optical triggering and severely limits the range we can work at.
As I already wrote in
response to awaldram, if you use a V6 close to your on-camera P-TTL flash then optical triggering works fine even in sunlight.
You'd have to use a contraption to guide the light from the flash into the V6 or, as I do, hold the V6 in front of the flash with your left hand, so that's not ideal, but it works.
Originally posted by mcgregni Am I right to say that this issue is one that only Pentax can resolve by engineering a trigger signal above 1/180th sec without an HSS flash on the hotshoe ? Or could a third party devise a 'workaround'?
Yes, as awaldram wrote, a third-party device would "just" have to emulate a P-TTL HSS device.
For other brands (Canon / Nikon) such third-party devices already exist. Pentax is just too small a brand to be of interest to player like Godox, Phottix, Pocket Wizard, Yongnuo, etc. We can be glad that Cactus is not just focusing on Canikon.
Originally posted by mcgregni I must say I am a bit bemused by the V6 optical solution .... (turn the control flash to face the V6 sensor ... ?? Huh?)
What's so funny?
Every time you use optical triggering, the optical sensor has to "see" the control flash. So why is it bemusing when that optical sensor happens to be in a V6?
Have you seen Joe McNally using an extra light stand for a dedicated controller flash that is connected to his camera via a long cable, just so that he can optically trigger his four or more remote speedlights optically? Now that's what I call bemusing.
Originally posted by mcgregni The issue of which optical slave mode to use and what delays to set is still a confusing mush to me ..... and I suspect to many others as well ...
Have you tried reading the manual?
Which part is not clear?
Your P-TTL manual is almost 80 pages long and while some of it is not about P-TTL details, most of it is. Here, we are talking about the choice between two optical triggering modes
- triggering on main flash (S2) -- sufficient in all but a few cases (when using a V6 as an intermediate trigger above a certain shutter spee)
- triggering on pre-flash (S1) -- required in a few cases (see above). Only here, a delay is necessary and it seems multiple people have success using the same delay for all apertures they need.
I elaborated a bit in my
response to awaldram.
Originally posted by mcgregni I'm amazed that it is not more clearly laid out as these Cactus products have been out for some time,,,
I find everything is clearly laid out in the manual.
To be frank, you are the first one to ask that many questions. Other Cactus users either don't use the HSS sympathy mode or figure things out from the manual.
Originally posted by mcgregni There seems to be questions and variation surrounding both the choice of optical slave mode (1 or 2) on the RF60 and the effects of aperture plus shutter speed.
I told you before that the shutter speed is irrelevant.
Also, why don't you try it yourself?
You've got the equipment and taking two test shots at two different shutter speeds would be sufficient to convince you that it isn't really as complicated as you appear to perceive it.
Same with the optical triggering mode. Why don't you just use S2 (triggering on main flash) and see whether you run into problems?
Don't get me wrong, I'm still happy to help, but if it were me, I'd just experiment a bit if things weren't clear from the manual.
Originally posted by mcgregni The issue raised before about the actual timing between a pre-flash and the trigger signal depending on camera (eg K3 being longer) is only applicable to S1 mode I'd presume?
Yes, since if you trigger on the main flash (S2), all the P-TTL delay business becomes irrelevant.
Originally posted by mcgregni I thought it was something to do with the V6. Until I poked around some more and found out that I had inadvertently set my camera flash mode to 'Red Eye Reduction' !!!
The triggering on the main flash (S2) may take care of that. It tries to figure out which flashes belong to the metering phase and which one is the main flash. I'd try it myself, but you won't see me using red-eye reduction in combination with radio triggers.