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Julian D

Member Since 19 May 2012
Offline Last Active Yesterday, 02:26 AM
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Posts I've Made

In Topic: YS-D1 Cutoff Issue

29 July 2014 - 01:11 AM

Hi.  Here's a couple few things you can try at home (with gear setup)

 

(1) Try increasing your ISO and reducing your flash power and see if this reduces the number of shots with the shutter showing.  Flash strength is proportional to duration so half strength will be roughly twice as fast and therefore allow a bit more latitude for the full flash while the shutter is open. Flash duration is very small but at full power on a small strobe I'm not sure it is as short as the conventional wisdom would lead us to believe.

 

(2) I read on a post here that someone noticed that the frequency of shutter appearing was different between landscape and portrait shots.  As the shutter is mechanical a bit of gravity (in the right direction) may possibly help.

 

(3) I've also read that hard wiring with sync cords gives better sync speeds than FO but I haven't seen anything that really explains why.  And that also doesn't explain the difference between your YS110 and D1.

 

Hope that helps.

 

Cheers


In Topic: Land based flash underwater?

13 July 2014 - 04:41 PM

Not sure if this helps or not but there's a Subal flash housing for an SB800 on e-bay at the moment (nothing to do with me). Cheers


In Topic: Complex DSLR system for scientific video -- thoughts on my plan?

30 June 2014 - 01:26 AM

Hi Troutnut, sounds like you have an interesting project on your hands.

 

I'm not an expert in video, and just a learner in still's I'm afraid but one thing that comes to mind reading your post is that if you are using a very wide lens and the fish is 10 feet away it will probably look tiny and you may not be able to see much detail in the footage.

 

I'm a keen trout fisherman and tried mounting my housing on a pole and taking some photos of trout cruising in a backwater not long after I got my housing.  I was using a tokina 10-17 lens and was surprised by how far away the fish looked even though they seemed very close.  Below is a photo of a trout 3 or 4 feet from my camera taken with natural light only (just a screen grab sorry). The water had a slight bit of turbidity but you can see in this photo that already the colour and detail is dropping off significantly.

 

Also I had a bike cable pulling the shutter lever and I noticed that when the trout were very close either the sound of the shutter or the slight movement of the lever spooked them a bit (not an issue with video I guess but worth considering). 

 

There is a guy on wetpixel who takes awesome photos of spawning salmon (the attached was a wild trout in a back country stream in summer).  I think his name is Tom Kliene (sp?) and I think he is also a salmon researcher so suggest you look him up and pm him.

 

Hope that is of some use and good luck with you project (make sure you post some footage).  It's winter here and I'm hopefully going to try again on some spawning rainbows soon.

 

Cheers


In Topic: What setup for good rig buoyancy with Aquatica D7000?

27 June 2014 - 02:07 PM

Thanks, that's good to know. Down in this part of the world I can't just rock into the local UW photo store and pick some of these up - it will be an international shipment with the freight likely costing as much as the floats.

 

The float belt works well but I find it creates a twisting force with so much buoyancy low down (maybe the port is heavier than the nauticam equivalent?).  It seems like a good idea to get the floatation up higher.  I'll up the buoyancy on my arms but I may try out adding just a few floats on the port when I have the 105 setup on.

 

Given there isn't really that many setups that we use, a table of housings with balanced buoyancy options would be a useful reference for putting together a new setup (without giving preference to any one brand).

 

Same experience with the z240's although my Ikelites were good too.  The size difference is useful - I can fit both 240's in the spot in my pelican case where I had just one Ikelite. I also tend to shoot in greenish water.

 

Still interested to hear from anyone who has used a different setup eg  mega float arms?


In Topic: What setup for good rig buoyancy with Aquatica D7000?

27 June 2014 - 03:08 AM

Thanks John, sounds good. I guess I must have regular size stix floats at the moment. 

 

Just to be clear - you don't need a float belt around the macro port with this setup?  If so it seems like less than I have now as the port float belt has 7 or 8 floats on it.  (I have the old 105mm and the manual focus port if that makes a difference?).