cactus v2 reciever, interfering with camera sensor?

i never realized this on my XTi, but on the 5d & cactus trigger, i notice some weird interference on the top of my images.

if i shoot without the cactus trigger, there is no banding issue up top. these are the v2s.

i dont know what would be causing this, other than cheap manufacturing. i used to stand behind my triggers, but not after i am seeing this. my cactus trigger is modded with the antenna also, which could be why.

-edited- just tested with a non modded trigger, and it seems to be fine. weird... i dont know enough about radio to draw conclusions, but maybe someone could chime in?

so... skyports/radiopoppers/​cybersyncs here i come i guess...

It looks like the flash is out of synch. Cactus trigges are famous for slowing the responce time when the battery drains out.
Try setting the shutter speed to 160 and see if it fixes it.

Papa Carlo wrote in post #7008956
It looks like the flash is out of synch.

Nope. The exposure goes clear to the bottom of the frame.

Sync problems result in black bottoms.

Curtis N wrote in post #7009197
Nope. The exposure goes clear to the bottom of the frame.

Sync problems result in black bottoms.

Now come on, that's a jazz dance from the mid 20s. And sync was NOT their problem...

Curtis N wrote in post #7009197
Sync problems result in black bottoms.

Titus213 wrote in post #7010160
Now come on, that's a jazz dance from the mid 20s. And sync was NOT their problem...

Actually, that line would sound better if were preceded with "Confucius say..."

Maybe try another memory card? Or different picture size? Or ....?

Is it random or consistent?y

Isn't the image inverted on the sensor, so the banding would be on the bottom of the sensor, the furthest from the trigger?

I'd say try another card like 40Dude pointed out.

The banding really looks like a bad card symptom.

In the strobist forum they discovered the same problem you have: http://www.flickr.com …0295239/?search​=5D+cactus Banding or erratic weird problems between cactus radio triggers and the 5D. My best advice is to get another radio trigger, the cybersync are a good option without breaking the bank

I read about the 5D issue too. Well, obviously you're not going to keep the Cactus over the 5D. I'll be the first to offer some cash so they don't end up in a landfill

dan <----- Just doing his part to be green

Very interesting problem.
This comment is easily my favorite from that Flickr thread:
" iaincaradoc Pro User says:
Congratulations! You've discovered why FCC approval is required for devices that emit RF. "

interesting, thanks for the flickr post.

i have two triggers. one modded, and one un-modded. and the unmodded one doesn't give me the banding issue.

sucks though, mine were flawless operation wise

e r y k wrote in post #7023924
interesting, thanks for the flickr post.

i have two triggers. one modded, and one un-modded. and the unmodded one doesn't give me the banding issue.

sucks though, mine were flawless operation wise

Ah, interference from a transmitting unit that does not comform to the same configuration as the test unit provided by the manufacturer for EMI emissions testing...it is no surprise at all.

Using my Vs2 and 5D for a while, I just bumped into that problem the day I made a lowkey shooting session. The banding is exactly the one that you show us on the top picture except that mine is red. I possess two unmoddified units, have the problem with both. But it's hard to see the banding in a very well lit scene...

Never heard of that with my 40D and XT.

lulu65 wrote in post #7125031
Using my Vs2 and 5D for a while, I just bumped into that problem the day I made a lowkey shooting session. The banding is exactly the one that you show us on the top picture except that mine is red. I possess two unmoddified units, have the problem with both. But it's hard to see the banding in a very well lit scene...

Never heard of that with my 40D and XT.

So I need to retract my earlier statement, about "a transmitting unit that does not comform to the same configuration as the test unit "...simply a badly designed product that somehow snuck thru EMI testing!