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Forum: Flashes, Lighting, and Studio 11-03-2014, 06:16 AM  
Cactus V6 misfires on Pentax ME
Posted By manntax
Replies: 12
Views: 1,829
Quite possible - this usually happened in close receiver-transmitter situations. I would say around between 50-100cm (1 meter) - so quite possible. I actually wasn't aware of any minimal distances, but that would explain the 'short' setting in V6.
Forum: Flashes, Lighting, and Studio 11-03-2014, 02:23 AM  
Cactus V6 misfires on Pentax ME
Posted By manntax
Replies: 12
Views: 1,829
From my own quite extensive experience with Cactus V5 - I can say that those misfires are occurying in 3 specific circumstances, from which two are quite obvious :

1) The batteries on either transmiter/receivers or the flash itself were weak and communication either was disturbed or flash simply misfired because was not fully charged ( could happen in your case since you've got through some shooting with K5 before - I assume with the same flashes and no fresh set of batteries). This is my most common reason when I use rechargeable batteries.

2) The communication between the camera and transmitter was disturbed due to transmitter not being tightened in the hot shoe or due to some dirt/grease being on the hot shoe. To remedy this simple use some alcohol-based cleaner and wipe the point of contact with cotton buds.

Now , the last reason isn't that obvious but surprisingly was happening many times ! With some flashes and in *certain* configuration of position of the camera with transmitter on it and the receiver with flash on it - the communication between transmitter and receiver is BLOCKED by the flash itself ! This is happening a lot with some flashes - like older pentax or sunpak flashes.
The remedy was always the same, change the position of receiver+flash combo ( e.g. angled differently ) or position of camera+transmitter combo - by moving slightly - so that flash would not stay in way to the receiver from transmitter. This was happening a lot to me when I had some macro setups with receiver + flash clamped and pointed downwards, and I was shooting from elevated position having my camera on the flash level. The body of flash was blocking the way in direct line from my transmitter to receiver. I was able to position the gear so that I could replicate this misfiring at any rate - this is confirmed, but applies to Cactus V5 , as I haven't gotten the V6 yet.

Hope these help.
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