RadioPopper JRx Units for your Studio Strobes - Impressive first look

[Kym Kilcrease]

i WANT TO READ LATER!

[gmarblestone]

It depends on what you mean by work with sb600. They are not ittl capable. All the jr's do is send a singal to flash to pop... that is UNLESS you have Alienbee units. IFF you have bees then you can change the power of the strobe from the "master" unit mounted on your hot shoe. For ittl you will need the full version radio poppers.

If you just want to set the sb600 on manual then you can probably make it work with a small adapter to add an input to the flash for triggering.

Hope that rambling helps

Originally Posted by jetblast

do they work wiyh the sb600?

[jetblast]

Originally Posted by gmarblestone

It depends on what you mean by work with sb600. They are not ittl capable. All the jr's do is send a singal to flash to pop... that is UNLESS you have Alienbee units. IFF you have bees then you can change the power of the strobe from the "master" unit mounted on your hot shoe. For ittl you will need the full version radio poppers.

If you just want to set the sb600 on manual then you can probably make it work with a small adapter to add an input to the flash for triggering.

Hope that rambling helps

it does. thanks

[ramiro]

Mike, I am interested in higher speed sync with a DSLR. I remember I could get 1/500 sync on my crappy old Nikon D70s, even with the poverty wizards from China. Sometimes I will use 1/320 on my camera and just keep the dark line from anything important in the frame, but if we could at least get 1/500 (1/800 would be better) sync on any DSLR, that would be great. Also, what about that video on RadioPoppers blog about getting high speed sync with the JrX units and an AlienBee strobe, I think up to 1/8000??

[gmarblestone]

The d70 had a mechanical shutter which allowed the 1/500 sync speed. The newer shutters are electronic and do not really sync above 200 (nikon).

Go to the radio popper site and they have tons of information and answers to your questions. Here is the video you were interested in.
http://radiopopper.com/blog/2009/02/...es-and-others/

Hope it helps

Originally Posted by ramiro

Mike, I am interested in higher speed sync with a DSLR. I remember I could get 1/500 sync on my crappy old Nikon D70s, even with the poverty wizards from China. Sometimes I will use 1/320 on my camera and just keep the dark line from anything important in the frame, but if we could at least get 1/500 (1/800 would be better) sync on any DSLR, that would be great. Also, what about that video on RadioPoppers blog about getting high speed sync with the JrX units and an AlienBee strobe, I think up to 1/8000??

[gregt1310]

What about the CyberCommander? Anyone know how they compare? Price is about the same (I believe).
If only I could get the Jrx to fire my Sekonic meter, then I could give up my PWII's.

[chemisti]

Originally Posted by gmarblestone

The d70 had a mechanical shutter which allowed the 1/500 sync speed. The newer shutters are electronic and do not really sync above 200 (nikon).

Go to the radio popper site and they have tons of information and answers to your questions. Here is the video you were interested in.
http://radiopopper.com/blog/2009/02/...es-and-others/

Hope it helps

Actually I believe that it is the opposite. The D40, D50, and D70 have an electronic shutter. An electronic shutter has no mechanical interference with the light pulse from the flash - it operates by turning the sensor on and back off very quickly. Thus, as long as the flash is synchronized with the on-off cycle, the flash can be used at very high speeds. Nikon artificially set the max to 1/500 in the firmware for these cameras - if the camera doesn't know a flash is attached, they can go even faster. Using radio triggers allows the high sync to work above 1/500, provided the rx triggers are capable of operating that quickly because the DSLR body doesn't know that a flash is being used - it just turns the sensor on and off at the prescribed speed.

NOTE: I may be incorrect, but the bodies above I think actually use a "hybrid" system where an inexpensive and slow mechanical shutter is used. The mechanical shutter is only capable of up to 1/250 second speeds. Above 1/250 seconds, the electronic shutter is actually used. The mechanical shutter still actuates, but the electronic shutter turns on-off while the mechanical shutter is open. As long as the electronic shutter is faster, the mechanical shutter has no effect on exposure.

The classic mechanical shutter on DSLRs allows the entire sensor to be exposed to a flash of light at low speeds (<1/200, 1/250, 1/320 second typically, depending on your body). This means that there is a time during the exposure that all of the sensor or film is exposed to the light path at any one instant. At higher shutter speeds, a "slit" travels across the sensor or film - no longer is the entire sensor or film exposed to the light path. When the very brief (<1/2000 second or less) flash occurs, dark bands cover part of the image. The higher the shutter speed, the less area of the sensor is exposed to the flash.

The high speed sync mode overcomes this by "strobing" the speedlight so that several smaller flashes occur as the shutter slit travels over the sensor. This is a clever engineering trick - but results in a significant reduction in flash power because the flash is really flashing several times very quickly.

[bondarnes]

Originally Posted by gregt1310

What about the CyberCommander? Anyone know how they compare? Price is about the same (I believe).
If only I could get the Jrx to fire my Sekonic meter, then I could give up my PWII's.

Read the second and third post above. Tom asked about the Sekonic meter and Mike said it will work the same.

[ramiro]

Originally Posted by gmarblestone

The d70 had a mechanical shutter which allowed the 1/500 sync speed. The newer shutters are electronic and do not really sync above 200 (nikon).

Go to the radio popper site and they have tons of information and answers to your questions. Here is the video you were interested in.
http://radiopopper.com/blog/2009/02/...es-and-others/

Hope it helps

Actually, I think it's the other way around, the D70 had an electronic shutter and all newer DSLRs now have only a mechanical. That is why the point and shoot cameras can sync at very high shutter speeds, because of the electronic shutter. And Nikon DSLRs, from the D80 and up sync up to 1/250.

I don't know the internal workings and have never used cameras other than 35mm SLR cameras, but if I understand correctly I believe medium format cameras have higher sync speeds, maybe in the 1/500 or 1/1000 range. I don't know if getting higher sync speed on DSLRs is some sort of limitation, but since an older camera had a higher sync speed (D70/s), I just don't see what the issue is for camera manufacturers to do that in current, specially professional level DSLRs like the D700, D3, from Nikon or ID and 1Ds models from Canon.

[rebardwg]

what's the difference between the JRx and the Px systems? Is there a comparison chart I can look at?

update:
is this right?
1)the jrx is not capable of e or i TTL.
2) in order for me to use high speed sync, I have to have a PX transmitter and a JRX receiver?
3) is the PX capable of e or i TTL?

[gregt1310]

Originally Posted by bondarnes

Read the second and third post above. Tom asked about the Sekonic meter and Mike said it will work the same.

I guess I missed that part. Thanks Don. That's a pretty cool feature.

[L Stegall]

Thank you thank you thank you for the update! I have been waiting on these. So good to know what's going on and will be ready to order when the green flag is dropped.

[Debbi]

Originally Posted by rebardwg

what's the difference between the JRx and the Px systems? Is there a comparison chart I can look at?

update:
is this right?
1)the jrx is not capable of e or i TTL.
2) in order for me to use high speed sync, I have to have a PX transmitter and a JRX receiver?
3) is the PX capable of e or i TTL?

I don't believe the jrx is capable of iTTL - but rather meant for strobes. I have the PX system and am capable of iTTL using two SB800's. It's a pretty cool setup - and now the brackets are available!

[gregt1310]

Originally Posted by MyKey

Captain - these guys will still work the same way using light meters - and they WILL Trigger Camera Bodies as well I have been told. I have not had time to test it out but it is in the manual.

Mike - can you elaborate on this a little more? Will the Jrx be able to trigger a Sekonic meter with the Pocket Wizard module? If so, are they using the same frequency as the PW??

Thanks.