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Bevanj last won the day on December 20 2018

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About Bevanj

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  1. Bugger. All the newer ports with larger port openings are expensive enough that I'd be tempted to buy a WACP rather than a new port. Still, given I paid ~500USD for the lens, it's no real loss to me. Bevan
  2. Hi All, Have any of you got the forementioned dome port handy and a set of veriners (or a ruler at a push)? I've just scored a Sigma 12-24mm F4 on the cheap in hope that it will fit. However, I don't have my port handy. Unlike most of their other ports, Nauticam don't seem to have the opening diameter listed for this port. Hopefully it'll fit. The lens is 102mm in diameter. If anyone could check the port opening diameter, it would be much appreciated. Bevan
  3. Cheers guys, Yep, very much aware of the benefits of manual flash- it is what I usually use. I was simply playing around and came across the above and thought it odd. Bevan
  4. Gah.... talk about embarrassing. Use quality fiber optic cables - not chunks of cutup toslink for ETTL. Compensation out of the dial on the Z330 is minimal though. At a stab it appears to be ~1/6 stop per click. Lesson learned.
  5. Hi Everyone, I've just been having a play around with my RX100VA, and 7d, along with my Z330 strobes (via optical connection), and have come across a puzzling problem. In STTL mode, no matter what I do, I can't get any FEC control via the EV control knob on the back of the strobe! All exposures come out identical! It would seem that in EV comp, the Z330s are cutting or adding output on the preflash pulse as well as the main pulse. So, the camera gets less return from preflash pulse, aims for +-0EV flash compensation (where the camera is set), then compensates for the Z330s diminished output - thereby nullifying the FEC set on the back of the strobe. This is confirmed if I put a sekonic light meter in front of the strobe, and hit the flash exposure lock on the 7d to produce a preflash. The Z330 EV control knob is 100% having an effect on preflash strength. I've tried the strobes with both the preflash magnet in and out. No difference. Any ideas?! I'm starting to wonder if my strobes have a bug. I've only ever used them in manual mode before now. I know they were from pretty early off the production line. Bevan
  6. Tef-gel is awesome for preventing stainless threads from corroding in aluminium.
  7. Hi Kraken, I could do... let me give it some thought. It took me quite a while to design and tune the circuit for optimum performance. Also, all of the components are only available in tiny packages like SOT-23 which there is pretty much no way to use without hot air soldering and custom designed PCBs. In short, it is some schmitt inverters, logic gates, and an RC circuit to control the time length the LEDs turn on for when triggered. I've got the Canon E-TTL protocol completely worked out now, and can get a Attiny chip to read the communication (MOSI/CLK) from a 5dmk3 to a 580EX2 speedlight and give the correct output responses (MISO) - proving my modeling of the protocol is correct. It is incredibly similar to the SPI protocol, but I have had to do some trick work to get it to function correctly with the Attiny chip. I've also tested this protocol model with other Canon cameras my family own such as a 7Dmk1, 20d and G12 - it successfully works for all of them. Now I just need to design a circuit board to fit in my housing... Bevan
  8. Dave, first pulse is camera dependent. I did some testing with a 20d, 7d and 5d3 and my 580ex2. All of the combinations, along with the 20d and 7d ibternal flash produce different pre-flash times. As for the main pulse, that will be distance dependent also.
  9. Cheers Bill, It's interesting to hear the Z240 numbers are similar. I'd be curious to know just how similar. Bevan
  10. Ok, Z330 0.1T numbers - these I am sure are correct. Wolfgang, light output is not linear relative to time. Have a look at the PDF, you'll see what I mean. Some interesting reading... https://strobist.blogspot.com/2010/06/rise-and-fall-of-machines-understanding.html -6.0 = 37us = ~1/27000 -5.5 = 47us = ~1/21000 -5.0 = 57us = ~1/17500 -4.5 = 67us = ~1/15000 -4.0 = 84us = ~1/11800 -3.5 = 105us = ~1/9500 -3.0 = 137us = ~1/7250 -2.5 = 179us = ~1/5600 -2.0 = 230us = ~1/4300 -1.5 = 312us = ~1/3200 -1.0 = 421us = ~1/2400 -0.5 = 577us = ~1/1750 Full = 2.06ms = ~1/480 Some interesting stuff to be read from this - especially for those shooting mirrorless or point&shoot... If you are cranking up your shutter speed to 1/500 and above, at full power, you are starting to cut into the flash output and loose light in that way. For the rest of us shooting through an actual shutter maxing out at 1/200 sync speed, it's not so much of a concern. Z330 T.1 output.pdf
  11. Oook. That definitely works. At a distance with a sheet of paper to dissipate some more power, I can measure the peak, and thereby generate some 0.1T numbers. Here's my 580EX2 on full power. Full power off the datasheet for this flash is 1/250sec i.e. 4ms. Looks like I'm right on the money.
  12. Yep. Pretty sure they're correct. For example, here's a scope plot for @ -6.0. The photodiode saturates, so I can't take 0.1T measurements where the duration is specified as on the rise at 10% of maximum brightness right through to falling at 10% of maximum brightness. I guess I could put the photodiode a larger distance away from the flash... Bevan
  13. I got bored and have just been doing some testing on my Z330s with an oscilloscope and some photodiodes. If anyone is interested, and as curious as me... here's a rough table of the flash durations of the Z330! They're not T.1 measurements, but are pretty close. FULL = 3300us = 0.0033sec -0.5 = 680us = 0.000680sec -1.0 = 534us = 0.000534sec -1.5 = 430us = 0.000430sec -2.0 = 348us = 0.000348sec -2.5 = 300us = 0.000300sec -3.0 = 257us = 0.000257sec -3.5 = 221us = 0.000221sec -4.0 = 186us = 0.000186sec -4.5 = 165us = 0.000165sec -5.0 = 130us = 0.000130sec -5.5 = 110us = 0.000110sec -6.0 = 97us = 0.000097sec For an interesting comparison of output power.... with the standard -0.3 soft diffuser in place, the Z330 somewhere between -2 and -1.5 (348us-430us) settings puts out the same amount of light as a 580EXII on full power (5600us!) with the wide angle 14mm diffuser flipped down. Impressive! The colour temperature is very different too - but that is to be expected. Bevan
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