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bvanant

Member Since 01 Apr 2002
Offline Last Active Mar 24 2015 12:42 AM
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#358641 Is underwater photography actually possible without a strobe? using the right...

Posted by bvanant on 07 March 2015 - 11:34 PM

Yes it can be done, I wrote a short article that is on the Optical Ocean Sales blog site about it. Of course you can do it, using relatively  bright LED lighting but you can't capture action and will have little DOF control. 

Bill




#357668 A6000 : can I use an external slave TTL flash? on a full M(Menual) mode? an w...

Posted by bvanant on 10 February 2015 - 08:49 AM

-2 to 2 stops on flash compensation is not manual flash control, at least in my opinion since 2 stops is only 1/4 power. Yes you can use TTL mode on the YS03 and it will work some of the time. The reason that I would like to have manual control (I too use the strobes on manual even though the camera is doing TTL) is that after a few shots at full power the strobe recycle time on the camera gets long, presumably because of heat concerns.  

I don't think any camera that can set an S value in A mode, that's why there is manual mode on the camera.

Bill




#357577 A6000 : can I use an external slave TTL flash? on a full M(Menual) mode? an w...

Posted by bvanant on 08 February 2015 - 04:39 PM

The Sony only has TTL, no manual mode at all so this should work fine. Just remember that Sony's implementation of TTL (on land) is not quite as nice as Canon or Nikon

 

Bill




#357246 Marine grade double sided tape?

Posted by bvanant on 30 January 2015 - 02:09 PM

3M 4941 VHB Double-Sided Acrylic Foam Tape

great stuff, works great, use it for many aquatic uses.

Bill




#356356 Movng to mirrorless or not ?

Posted by bvanant on 06 January 2015 - 08:48 AM

You can use the D7000 in live view, why not?

Bill




#354429 Zeiss Touit 2.8/50M for Sony E-Mount

Posted by bvanant on 17 November 2014 - 04:16 PM

Yes indeed I did mean the Zeiss 50 (is there a 60?) :lightbulb: In any case, I do have the pre-AF off and it is still quite slow to focus. I would manual focus but then everything would be blurry 

Bill




#354368 60mm VS 100mm DOF

Posted by bvanant on 15 November 2014 - 01:02 PM

For me, my go to lens on DSLR was always the 60 mm with a 1.4 teleconverter.  That being said in u4/3 I now use either the Oly 60 or the Panasonic 45 for macro stuff.

 

Bill




#353857 Missing C-Clip in Nauticam NA-EM5 housing. How to replace?

Posted by bvanant on 29 October 2014 - 10:48 AM

You can get c-clips from McMaster Carr, but I would call Scott at Bluewater and see if he has one or at least tell you what size it should be. On my EM-1 housing, the fn1 shaft is 2 mm diameter and the total width is 3.9 mm suggesting that the correct c-clip is 

98543A070
 

 from mcmaster. You can get 50 for $9, my guess is that it would cost you that much to ship the one from Reef.

Bill




#353681 WTB - Inon Fiber Optic Cable - parts or whole

Posted by bvanant on 24 October 2014 - 05:49 PM

Just buy the adapter from Inon-Sea &sea from Divervision and some optical cable from "thefiberopticsstore.com and you will be good to go.

Bill




#353654 Lens choices for a MFT system

Posted by bvanant on 24 October 2014 - 12:19 AM

The 12-50 is moderately wide and moderately macro. The nauticam port lets you switch;

Bill




#353443 F'n Stop - big rookie mistake

Posted by bvanant on 17 October 2014 - 11:40 PM

On the back of my 7d housing is a label that says "flash up?"
Bill


#352444 People Magazine

Posted by bvanant on 08 September 2014 - 05:06 PM

This week's People Magazine (Sharon Tate on the cover) had a blurb in things to watch that highlighted DiveFilm HD and the Secret World of Sea Slugs in particular. That video is coincidentally by my wife and Wetpixel member Nannette Van Antwerp. You can see it at dive film HD or at

http://www.blueviews...s13_640x360.mov

 

Enjoy

 

Bill




#351767 Help! Nauticam lubricant for blue S&S o-ring?

Posted by bvanant on 19 August 2014 - 08:04 AM

That is why I use Tribolube 71. Christolube in my hands at least stays "wet" for more than 6 months but it does dry out in a year, so far Tribolube hasn't dried in over 15 months.
Bill




#351635 How to shoot like Japanese UW photographer?

Posted by bvanant on 16 August 2014 - 08:49 AM

I think Bokeh is not the appropriate idea here. Bokeh is a characteristic of a lens (not a style). You can shoot shallow depth of field with any lens/camera that will allow it, but as far as I understand it Bokeh means the "pleasingness" of the out of focus areas and has a lot to do with lens design and some magic thrown into it. For a look at how to measure bokeh, take a look at 

http://photo.net/nik...ra-forum/00aDI7

:clapping:

Bill




#350009 TTL, a-TTl, e-TTl, e-TTL II

Posted by bvanant on 08 July 2014 - 07:56 AM

There is a lot of confusion about the whole TTL universe. As far as I understand it (about 2 cm worth) eTTL is Canon's proprietary TTL system that lets Canon cameras talk to Canon strobes. iTTL is Nikon's version of the same. If you are shooting a Canon camera and using a housed Canon strobe then eTTL works fine (if you have the right electrical connections). Same for Nikon.  Neither Canon nor Nikon have published their TTL protocols (they want you to buy their stuff) but several folk have figured out how to emulate Canon and Nikon TTL protocols. If you use electrical sync then there are converters (Weikamp, S&S, Ike) that plug into your cable/hot shoe) and allow you to get TTL functionality from strobes that can speak that version of TTL. If you are using optically fired strobes then you need to emulate TTL (sTTL) for example. This typically works by sending a pre flash from the strobe to the subject then calculating the correct exposure then exposing the scene with the correct strobe duration. 

Hope this helps

Bill


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