Eli Ranger at 1/8000 with 40D

I just got a set of Yongnuo YN-622Cs today

Manual power setting and ETTL works perfectly (Radio Poppers should be going out of business competing with these).

I plugged a transceiver in the sync port on my Ranger RX pack with an S Head. At power on the A channel both 1.5 and 7.5 I get clean frames as fast a SS as I can go at 1/8000.

8.25 reflector with 11 degree grid at 5 feet wast approx F5.6 at 1/8000.

Unless the camera is messing with me and showing 1/8000 but actually 1/250 then this is effing amazing! As I dialed the SS up, exposure went down, so that should be indicative of this working.

Further tests to come.

Interesting data point.....Have you tried it with any other studio lights? I am curious how they behave with Elinchrom RX600's or AB 800's.

Regards,

110yd

Hi Lloyd

I plan on testing the 500BXRi, DLite4, Quadra and Ranger RX with the A head. The portable packs are what I'm most interested in because that's what I'd be using outside the studio.

I would like to see a sample at 1/8000. Wide angle against a wall 20 feet away would be helpful.

What people tend to forget is that using the "hyper sync" hack is turning the monolight into a constant light source. One that is degrading as the shutter slit travels across the frame. At just over sync speed, presuming the flash duration is slower than shutter travel time, approximately 50% of the total light generated by the tube firing is available. There is a noticeable gradient from the start to finish of the shutter slit travel.

The other consideration is that as shutter speed increases shutter curtain speed does not increase. Rather the slit between leading and trailing curtains narrows. The result is that a smaller percentage of the available light from the flash tail is able to strike a specific portion of the sensor. Thus less exposure.

aroundlsu wrote in post #15187683
I would like to see a sample at 1/8000. Wide angle against a wall 20 feet away would be helpful.

It should look like an exposure at any other shutter speed greater than sync speed. A gradation from beginning of shutter travel when the tail is stronger to end of shutter travel when tail is weaker.

What would be interesting is for someone to shoot the white wall at shutter speeds increasing from Sync speed to top speed and then read, using Lightroom, the different exposure values beginning to end of shutter travel and then decrease in EV for each incremental increase in shutter speed from 250 to 500 to 1000 etc.

This will be complicated by the fall off cone of the light source.

aroundlsu wrote in post #15187683
I would like to see a sample at 1/8000. Wide angle against a wall 20 feet away would be helpful.

this is the best I can do right now. It's from 11 feet, efix is intact. full power on Ranger RX pack A channel (1100 WS)

Fall off on camera right is fall off from the 8.25 reflector with 11 degree grid. This is shot into a dark gray background.

dmward wrote in post #15187867
What would be interesting is for someone to shoot the white wall at shutter speeds increasing from Sync speed to top speed and then read, using Lightroom, the different exposure values beginning to end of shutter travel and then decrease in EV for each incremental increase in shutter speed from 250 to 500 to 1000 etc.rce.

This is on the agenda for the weekend.

Tonight I couldn't reproduce what I had last night, so I don't know WTF is going on. I am getting clean frames though at max sync instead of 1/3 under. I'll have to dweeb with this over the weekend. Weird.

I got my Einsteins back so I'll give it a try too. Interested to see if they will work with the 622s.
Unfortunately, they will have to be a full power so it will be hard to get the sync speed shot not to be overexposed.

I've talked with an Einstien user and he's had no luck.

windpig wrote in post #15188476
I've talked with an Einstien user and he's had no luck.

I know, I've had little luck as well. At full power the tail drops off quickly and there is no tail at slower speeds.