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Ryan

Member Since 22 Feb 2003
Offline Last Active Yesterday, 02:46 AM
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Posts I've Made

In Topic: Panasonic 8mm + Zen DP-100-S3 + PA-N85-S3 = dome petals visible in photo?

16 March 2015 - 02:25 PM

Aleksandar, shoot an email to glass at zenunderwater.com.  You have an older DP-100-S3, from back before Nauticam even existed I think, that was a two piece design.  Now it is a one piece part, placing the glass closer to the Panasonic 8mm lens, and solving this problem.

 

With current parts there is no vignetting with E-M5 and Pansonic 8mm.  


In Topic: Problems: new Nauticam housing w/ Canon 7DII

09 March 2015 - 01:35 PM

Everyone else here is on the right track, AF-Assist needs to be shut off.  I'm guessing on your old system strobes were fired electrically with sync cables, and this one optically, which requires some different strobe settings and other considerations.

 

Z-220 (blast from the past!) doesn't do optical ttl (Inon S-TTL), and my guess is that using it alongside the Z-240 will cause inconsistent results from the Z-240, so the best bet would be to use manual flash (as Alex describe above) on the camera's internal flash, and both external strobes.

 

There is no way to disable firing on a preflash with Z-220 unless you purchased an optional part from Inon called "Focus Light Controller," which I've found listed online below.  This is causing the full power flash behavior you describe (IE strobe unloads all of its energy on preflash or af-assist flash, and has nothing left for the exposure flash).  

 

 

Half power and below will work fine, with the strobe manual double flashing on preflash and exposure flash with the output set on the flash head.

 

Fortunately, with your your system, you don't need this other piece.  Just set the camera popup flash to M, and a low power.  Put the Z-240 Magnet "in", and set the output power manually on each flash head. The Z-220 magnet switch is irrelevant in this case, only having to do with focus light operation.

 

2 - the camera wouldn't take a shot every time.  It was in focus, but no matter how I pulled the trigger nothing would happen.  Missed some shots because the dumb thing wouldn't go.  My buddy heard me screaming in frustration at this point.  Didn't happen consistently and didn't always happen on moving subjects - it also happened when I was shooting something stationary.

 

Two things jump out at me here....  One is focus mode, in One Shot or AI Focus the camera won't take a picture that it doesn't think is in focus, and even if the image appears to be in focus through the viewfinder, if the camera's af brain doesn't agree it won't take the picture.  This is the reason I shoot AI Servo, I can see things as in focus that the camera can't.  This performance should be consistent with your previous systems, so I'm not thinking it is your issue.

 

Internal "pop up" flash recycle time is an issue with all optically triggered systems, and one that has to be managed.  The AF Assist Flash and Flash outputs are draining your internal flash, and it takes some time to recycle.  There are also electronics that prevent the popup flash from overheating, and will regulate performance.  This will be much less of an issue when you switch the popup flash over to manual power and a low fractional output (like as low as it goes...).


In Topic: Upcoming Panasonic GH-4K

05 February 2015 - 08:16 AM

Thanks for the info Peter, I'll certainly see if I can replicate it.  I haven't witnessed it in my own use.

 

Apologies for coming across as rude.  My intention was a common, tongue-in-cheek expression of skepticism...


In Topic: Upcoming Panasonic GH-4K

05 February 2015 - 06:41 AM

My favorite wide angle lens for 4k video on GH4 is 8mm fisheye.  The 4k crop knocks out most of the fisheye distortion.  I don't find 7-14 to be wide enough for many situations.

 

RE: purple reflections in macro video from Keldan lights, I call bs on that one.   I'm willing to be proven wrong if anyone could demonstrate the phenomenon...

 

Moses is very kind with his recommendation, but I think all of the Nauticam dealers in the Americas are pretty on the ball.


In Topic: Panasonic LX-100 Nauticam housing

05 February 2015 - 06:18 AM

Thomas Lam from Nauticam deserves a lot of credit for taking the time to actually measure these (and basically every other lens on the market).  The measurements were actually done twice by Thomas, and verified by Alan Dewey at Reef Photo.

 

The CMC magnification table listed in the press release is actual measured data, in water.

 

Working distance is measured from the front of the housing port, or front of accessory lens.  It is the actual space between the underwater system and subject.

 

All of the systems listed achieved their best "native" magnification at their widest focal length, and very close to the subject.  

 

All of the systems listed achieved the magnifications listed with CMC are at full telephoto.  It is possible, but not likely that some of these could actually have slightly better magnification if you pulled the zoom back a couple of clicks.  In the interest of consistency we didn't try to establish these situations.  We wanted repeatable results.

 

CMC isn't just a simple diopter, so I'm going to try to resist those comparisons.  The actual end magnification with today's top compacts (RX100m3, G7X, and LX100) was in line with simple housed +15 diopter macro lenses.  There were noticeable image quality differences, though.