[tjack]

Standard Priolite strobes, like MBX 500 or MBX1000, have a very short flash duration of 1/4500 sec at full power. When triggered in HotSync mode (fast shutter speeds) the strobe will only expose a part of the sensor. Most of the sensor will not see the light of the strobes and a black bar will appear. If you want to mix Priolite standard strobes with HotSync strobes, make sure you stay below the sync speed to avoid black bars.

[mikeSF]

I realize this is an older thread but have been looking forward to trying the Priolite strobes for myself to see if the hot sync feature works on the 645Z.

I received the MBX500 HS Ultra, which may be the newer version from what you tested. Straight out of the box I am getting shutter speeds up to 1/4000th(645Z) and 1/8000th(K3 II) with no uneven illumination at all. The test shots all look good.

[Class A]

Straight out of the box I am getting shutter speeds up to 1/4000th(645Z) and 1/8000th(K3 II) with no uneven illumination at all. The test shots all look good.

Are you checking the strobe's illumination for the full frame, i.e. from top to bottom?

Initial tests of the older model only considered illumination in part of the frame (in the middle). Any problems are to be expected near the vertical edges.

[mattb123]

I realize this is an older thread but have been looking forward to trying the Priolite strobes for myself to see if the hot sync feature works on the 645Z.

I received the MBX500 HS Ultra, which may be the newer version from what you tested. Straight out of the box I am getting shutter speeds up to 1/4000th(645Z) and 1/8000th(K3 II) with no uneven illumination at all. The test shots all look good.

That's good to hear! One day I'll get these or something similar once they seem consistent and I can afford it.

[mikeSF]

Are you checking the strobe's illumination for the full frame, i.e. from top to bottom?

Initial tests of the older model only considered illumination in part of the frame (in the middle). Any problems are to be expected near the vertical edges.

Yes and there are no issues.

[UncleVanya]

Yes and there are no issues.

Would you be able to post some pics with full EXIF?

[mikeSF]

Would you be able to post some pics with full EXIF?

Sure, here you go:

Mike Oria Photography | Priolite MBX500 HS ULTRA testing

---------- Post added 01-26-2017 at 01:54 AM ----------

Sure, here you go:

Mike Oria Photography | Priolite MBX500 HS ULTRA testing

These show min power(5.0) and max power(10.0) from 1/1000-1/8000th sec on the K3II, adjusting ISO to accommodate exposure.

Tomorrow I will shoot a few with the 645Z. Please let me know if there is a specific situation you would like me to set up.

---

Last edited by mikeSF; 01-26-2017 at 02:16 AM.

[Class A]

These show min power(5.0) and max power(10.0) from 1/1000-1/8000th sec on the K3II, adjusting ISO to accommodate exposure.

Thanks a lot for the test shots.

Not sure, though why you stated that there aren't any problems. Do you not see the gradient? The bottom part of the frame is consistently brighter than the top part; exactly what one would expect from a HyperSync solution (as opposed to HSS).

I'm not saying the solution produces unusable images but AFAIC, these images show the need for post-processing when using this technique.

[mikeSF]

Thanks a lot for the test shots.

Not sure, though why you stated that there aren't any problems. Do you not see the gradient? The bottom part of the frame is consistently brighter than the top part; exactly what one would expect from a HyperSync solution (as opposed to HSS).

I'm not saying the solution produces unusable images but AFAIC, these images show the need for post-processing when using this technique.

that is light falloff from the beam because I am in a small room with wide angle lens and did not have space to back up or use a modifier. The light is setup below the camera and lighting the bottom of the scene brighter as a result; this is not a function of the shutter sync as far as i can tell. I thought I was looking for black banding across the frame at fast shutter speeds, and do not see any of that in these test shots.

If you like, when I have time to set up in a larger space, I can try again.

[tjack]

I have a MBX 500 and a MBX 1000 Priolite HotSync light and a MBX 300 Breeze now and will post some test shots soon also.

I see no problems but I suppose people that are picky with testing can always find problems with some shots.

With the 645D I can only go to 1/4000 a second shutter speed on the MBX500 and MBX1000 light, and with the MBX300 it is only good at 125th as not HotSync.

Adapting PCB Hard Modifiers to Accept Bowens S Mounts - Mark Kitaoka Photographs

A lot depends on the reflector your using and other modifiers, and how many strobes your using. With just one you will have some darker areas in the shot.

[mikeSF]

Well, I shot an array of tests using he 645Z and am indeed seeing random uneven illumination on these, particularly at the lowest power(5/0) setting with shutter speeds under 1/500th. When I re-shot, the behavior changed a bit, but suffice to say, there could be an issue worth investigating. At this point, I am not sure it would dissuade me from using it in a real world situation, but time will tell.

[clackers]

Well, I shot an array of tests using he 645Z and am indeed seeing random uneven illumination on these, particularly at the lowest power(5/0) setting with shutter speeds under 1/500th. When I re-shot, the behavior changed a bit, but suffice to say, there could be an issue worth investigating. At this point, I am not sure it would dissuade me from using it in a real world situation, but time will tell.

This is an intrinsic problem of hyperync, Mike.

It just isn't HSS.

But someone of your skill will work around it.

[Class A]

This guy didn't have any issues either, 654z or a 1DX Priolite MBX1000 HotSync - Initial Tests - Mark Kitaoka Photographs

In his sample shots, the illumination only pertains to a small middle part of the frame.

Have a look at the results from this disappointed user. As clackers said, this is just HyperSync, it inevitably must feature a bit of a gradient. I'm talking about the older Priolite version but I'd be surprised to learn that they Priolite was able to improve on the gradient issue with newer versions.

[tjack]

Test shot at 1/3200

One light only at 7 precent on a MBX500 HS

Don't see the imaginary gradient that makes it not usable.

Will do some more testing soon, have to get everything set-up.

[UncleVanya]

Test shot at 1/3200

One light only at 7 precent on a MBX500 HS

Don't see the imaginary gradient that makes it not usable.

Will do some more testing soon, have to get everything set-up.

Might be easier to see on a uniform white wall shot.