Einstein questions answered
/forum/topic/876748/0

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Paul Buff
Registered: Oct 06, 2006
Total Posts: 2797
Country: United States

RE http://www.fredmiranda.com/forum/topic/835412/18#lastmessage
Apparently this topic has been locked, yet legitimate questions remain, which I shall answer here. Moderators - if my presence is not desired on FM, just let me know and I will cease posting.

Question 1:

Paul, does adding an Einstein like reliable communications port to the Zeus make engineering and business sense?

Answer: Sorry, this doesn't make economic sense. To properly implement this would require a complete new product. Ir's very hard to implement IGBT control when capacitors are shared to multiple heads.The current Zeus is considered, by the remote, as a single light. We're I to try to implement IGBT control and remote of the channels separately it would be impossible to obtain any degree of accuracy since what one channel asks from the caps affects what is available to the other channel. Plus, each flash head has a different duration and color temperature so the task of creating the sort of accuracy and control found in Einstein would fall somewhere between impossible and a system even more complex and expensive than Bron.



Paul Buff
Registered: Oct 06, 2006
Total Posts: 2797
Country: United States

Question 2: I assume the zeus can take the CC/CSR+...doesnt that get you a lot of the control. i know you wont get the color temp and flash duration control, but to me, the digital control and modeling lamp control would be a nice feature.

i dont have any of those remotes, but i do plan on adding them at some point to my x3200s and abr800.

Answer: Cyber Commander and CSR+ stores and displays t.1 duration and color temperature info for every possible configuration of Zeus and flash head, but treats one Zeus as one light, and therefore cannot calculate or control two light heads separately.



Paul Buff
Registered: Oct 06, 2006
Total Posts: 2797
Country: United States

Question 3: Paul -

Dumb Question: Does the Einstein use capacitor switching (as the AB Max was to) in addition to IGBT management, or does IGBT technology render capacitor bank switching unnecessary?

Thanks.

Answer: No, the implementation of IGBT control eliminates any need for capacitor switching and provides far more accuracy and performance than capacitor switching schemes. In particular, while capacitor switching can shorten t.1 durations and is a step toward more constant color, there remains the "tail" of the flash discharge curve that still causes motion blur beyond the t.1 time - at an intensity of 3f below the peak exposure. This can still blur lighter color portions of the scene significantly more than the t.1 time would imply. With pure IGBT control there is no "tail" so the action stopping is truly equivalent to the On/Off action of a mechanical shutter. See http://blog.bronimaging.com/2010/01/broncolor-scoro-enhanced-color-temperature-control-ectc/ for a good explanation of properly configured IGBT control.



E-Vener
Registered: Jun 18, 2009
Total Posts: 4260
Country: United States

The Einstein manual is on line: http://www.paulcbuff.com/pcb2009/einstein.html



photomarvin
Registered: Sep 23, 2005
Total Posts: 1789
Country: United States

to be honest I don't see a whole more contained in the manual than what had been already posted on the Einstein site...just reorganzied



Paul Buff
Registered: Oct 06, 2006
Total Posts: 2797
Country: United States

Did you click the download manual link? There is a host of information in this manual.



bacilonur
Registered: Aug 14, 2006
Total Posts: 2706
Country: United States

Same bulb for 110-240 is nice. What's the highest power setting that stays constant at 8 and 5fps? I saw the 1/10 spec, just wondering if you had any high FPS tests.



Paul Buff
Registered: Oct 06, 2006
Total Posts: 2797
Country: United States

bacilonur wrote:
Same bulb for 110-240 is nice. What's the highest power setting that stays constant at 8 and 5fps? I saw the 1/10 spec, just wondering if you had any high FPS tests.


I haven't done complete testing of this yet. Einstein will reach 100% recycle at approximately these rates:
640WS = 1.7 seconds
320WS = .85 seconds
160WS = .43 seconds
80WS = .24 seconds
40WS = .13 seconds

However, Einstein will fire before 100% charge is reached. Even if you speed fire before 100% ready, the nature of the IGBT circuitry is completely different than conventional studio flash in that the capacitors don't completely discharge with each shot so at the lower power settings, only a small portion of the capacitor charge is dissipated with each shot. Thus a fast sequence of shots - faster than the 100% recycle time, will cause much less variation in exposure and color from shot to shot as you would see in a conventional system.

For example, a shot at 1/16 power leaves about 15/16 capacitor charge, thus an immediate second shot will have most of the charge remaining and will not affect the output significantly. A long sequence of shots way before 100% recycle will result in a successive lowering of exposure as the capacitors are discharged at a faster rate than the charging circuit can keep up with. This action is similar to a speedlight set at low power.

At a guess, I would say you could expect good 5fps performance at about 1/10 power (64WS) and 8fps at about 40WS. But don't quote me yet . . . I'll try to do some tests and give you more exact info.



amplexis
Registered: Mar 11, 2005
Total Posts: 331
Country: United States

Paul, is it possible to provide multimax like features like speedcycler and multipop using future firmware updates for Cybersync/Einstein? it seems like IGBT could make very elegant implementations of these features.



Paul Buff
Registered: Oct 06, 2006
Total Posts: 2797
Country: United States

amplexis wrote:
Paul, is it possible to provide multimax like features like speedcycler and multipop using future firmware updates for Cybersync/Einstein? it seems like IGBT could make very elegant implementations of these features.

This sort of stuff is certainly possible but would require a great deal of research and programming. Fortunately, all the elements are in place so it wouldn't require additional hardware costs - at least not at first glance. The biggest concern would be what is needed/desired and potential sales volume VS development costs.



kenyee
Registered: Jul 08, 2008
Total Posts: 1528
Country: United States

Paul Buff wrote:
However, Einstein will fire before 100% charge is reached.


Is there an option to wait for it to reach 100% (or maybe some percentage like 80% to minimize color changes) before it'll fire? Someone's going to gripe about color casts because they fired a sequence w/o waiting for the beep so think of this as a dummy setting :-P



bacilonur
Registered: Aug 14, 2006
Total Posts: 2706
Country: United States

What he's saying is that there won't be a color shift (at least noticeable) when it's partially discharged, due to the IGBT control. It would be nice to enable only firing at 100%, but it's not too bad since it has a piezo now.



Paul Buff
Registered: Oct 06, 2006
Total Posts: 2797
Country: United States

kenyee wrote:
Paul Buff wrote:
However, Einstein will fire before 100% charge is reached.


Is there an option to wait for it to reach 100% (or maybe some percentage like 80% to minimize color changes) before it'll fire? Someone's going to gripe about color casts because they fired a sequence w/o waiting for the beep so think of this as a dummy setting :-P

They won't be nearly as unhappy with shots that need a little post work than with blank frames. That's why we allow fire before 100%. If your at a fixed motor drive speed and you're shooting 5% faster than 100% cycle you'll get every other frame blank without this feature.



kenyee
Registered: Jul 08, 2008
Total Posts: 1528
Country: United States

Paul Buff wrote:
They won't be nearly as unhappy with shots that need a little post work than with blank frames.


...no doubt they'd gripe about the blank frames



kenyee
Registered: Jul 08, 2008
Total Posts: 1528
Country: United States

Paul Buff wrote:
They won't be nearly as unhappy with shots that need a little post work than with blank frames.


...no doubt they'd gripe about the blank frames



bacilonur
Registered: Aug 14, 2006
Total Posts: 2706
Country: United States

Paul, another question:

What is the length with the cover on compared to the current ABs with the short flash cover? Will it be close enough to pack like this without removing the pyrex dome?

http://i42./35jmjiw.jpg



Paul Buff
Registered: Oct 06, 2006
Total Posts: 2797
Country: United States

Those are the only two choices with any flash if you fire before 100% ready.



Paul Buff
Registered: Oct 06, 2006
Total Posts: 2797
Country: United States

bacilonur wrote:
Paul, another question:

What is the length with the cover on compared to the current ABs with the short flash cover? Will it be close enough to pack like this without removing the pyrex dome?

http://i42./35jmjiw.jpg

Einstein would be about two inches longer unless you took out the model lamps and the glass dome. Even then it would be around 3/4" longer. The short AB covers shown require removing the model lamps.



bacilonur
Registered: Aug 14, 2006
Total Posts: 2706
Country: United States

Gotcha. So the short covers don't fit on the Einstein?



Paul Buff
Registered: Oct 06, 2006
Total Posts: 2797
Country: United States

Short cover will fit, but you would have to remove the glass dome and the modeling lamp. The Einstein body is 1" longer than AB but 1/2" smaller in height and width. I would recommend leaving the dome on. It's not hard to remove, but not as easy as the short cover - and it protects the lamps. Sorry to mess up you tidy little package. Complete Einstein dimensions are in the download manual.



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