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Forum: Flashes, Lighting, and Studio 04-27-2018, 11:20 AM  
Cactus vii 645z HSS issue.
Posted By cameradork
Replies: 33
Views: 3,827
Quick question. How much power on average do you all think you are losing on hss? I realize this isn’t a Pentax specific question but my guess is I’m losing about 2 stops.
Forum: Flashes, Lighting, and Studio 04-25-2018, 06:54 PM  
Cactus vii 645z HSS issue.
Posted By cameradork
Replies: 33
Views: 3,827
Hey guys,

Finally my 45-85 arrived today and hss worked immediately, upto 1/4000 (with very slight darkening of the top of the frame) with a Vii on the hot shoe, and one into the sync port on the AD600.


Looking forward to trying the 35A when it shows up.

I have yet to try any other trigger setups, but hoping to try a Profoto b1, a Godox canon trigger and the ft16 setup this weekend.

Thanks for all the help!

-Tony.
Forum: Flashes, Lighting, and Studio 04-22-2018, 04:00 PM  
Cactus vii 645z HSS issue.
Posted By cameradork
Replies: 33
Views: 3,827
Mcgregni looks like that is my issue. I’m using an adapted mamiya shift lens. I’ll try it again this week with an af.

---------- Post added 04-22-18 at 04:30 PM ----------

I am using PEN.A.001
Forum: Flashes, Lighting, and Studio 04-22-2018, 12:35 PM  
Cactus vii 645z HSS issue.
Posted By cameradork
Replies: 33
Views: 3,827
Thanks guys. I have the firmware all updated.

One thing that crossed my mind, is that i am trying to get this to work with a fully manual lens, and that hss requires lens communication to the body.

I’ll try an af lens and see if that gets me anywhere.
Forum: Flashes, Lighting, and Studio 04-21-2018, 10:02 PM  
Maximum ISO for flash work
Posted By cameradork
Replies: 28
Views: 2,000
There is no correct answer this question. Every situation is different.
Forum: Flashes, Lighting, and Studio 04-21-2018, 09:56 PM  
Cactus vii 645z HSS issue.
Posted By cameradork
Replies: 33
Views: 3,827
I have been racking my brains trying to figure this out, and have not yet been able to find a solution.

I recently bought a pair of Cactus Vii to work with my pentax 645z, and Godox ad600, and no matter what I seem to try, there seems to be a communication error.

I have tried-

Cactus V2 with Godox ad600, using the x1N. I know this setup has not been proven to work, so I purchased the Godox FT16/USB receiver setup as described here, and tested setup as reccomended.
HSS Pentax 645Z Godox 600 – Mark Kitaoka Photographs

In addition I have tried Profoto B1, with a Cactus Vii and Profoto remotes, both Canon and Nikon as described here:















You Tube




also tried a cactus vii on camera, and another connected through sync port.

I must be missing something. With these settings.

(c) pentax
(f) manual or auto

I get nothing. The camera won’t fire over 1/125, and in fact sometimes becomes locked at 1/125. Wont allow me to drop the shutter even below that speed. 

Anyone see something I could be missing? I have updated the firmware on both cactus units.
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