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Member Since 07 Nov 2004
Offline Last Active Today, 11:12 AM

Posts I've Made

In Topic: Wetpixel strobe review

09 March 2018 - 01:52 PM

I am just back from Hawaii where I used the Retras for all my underwater shots. I used the battery extension compartment with new black Eneloops for 100% of the shots. I attended the Ocean Sciences Meeting in Portland, OR the week before going to HI. I packed the strobes with fully charged batteries prior to leaving for Portland complete with extenders. I.e., they traveled with eight batteries per strobe inside.  I topped off the batteries upon arrival in HI and indeed found that they needed re-charging.


The strobes worked well. I depleted the strobe batteries by only one LED (of four) worth of charge (when I remembered to check) over the two-week diving period (with a day off to switch islands) and doing multiple dives per charge. I did four blackwater dives and did not bother recharging before doing a dive the next morning (three of the four).


My only mistake was removing the extender compartment together with the door once. It was challenging to pull the door off with my less than dexterous fingers. It is best to hold the compartment against the strobe with one hand while unscrewing the knob with the other. The unscrewing action lifts the door off very nicely. The battery compartment design is much better than other recently used AA-battery powered underwater strobes IMHO - Seacam 60D and Inon Z220 (same battery compartment as 240 and 330).



In Topic: Halation Problems

09 March 2018 - 01:21 PM

The shot showing the glow around the hand is likely due to light scattering by water and stuff in the water. Solutions are to get closer and to move light source more to the side (to avoid straight back reflection of light off subject). These solutions may not be possible for all scenarios. I have had to toss a number of pix because of this myself.


Not sure exactly what the issue is with second pic.  Keep in mind if you are using an underwater camera rig for topside shots there will likely be issues related to the extra glass (not part of the lens design of the lens being used) such as the port. Drops of water being the main problem. However there may be issues like those one gets from using filters: especially lens flare. These issues have not stopped me from taking topside shots with an underwater rig :->>

If the lens or port being used has issues as described by Undertow, then they would factor in as well. However, one can get your glow even with OK optics.

In Topic: What lens for canon FF for rhinopias

04 February 2018 - 01:30 PM

The Canon 60mm EFS macro will work on a Canon FF body if used with the 12mm MkII Extension tube. It will allow for focus up to about 40cm which may be a little tight for your needs. The Canon 50 macro is a good little lens too and despite its slower mechanical focus, works very well in many situations (how did we work with such lenses on film?). The 50 macro is optically good and myself and my wife have both used it successfully on subjects such as jellyfish in temperate waters which are somewhat murky. Either may work for you, and my only reservation on the 100 macro is that it can sometimes be fussy and hunt a little in my experience.


Not enough justification for me to buy the 60 EFS lens IMHO. I have (at least it was cheap!!) and have used the Canon 50 macro under water as well but that is no justifcation for Canon not having brought this lens up to date. Meanwhile how many different Canon 300/2.8 lenses have come??

In Topic: What lens for canon FF for rhinopias

02 February 2018 - 05:13 PM

Keep in mind that a 50mm f/1.4 lens will have 0.45 to 0.5 meter minimum focusing distance (about 1.5 feet). This means that at minimum focus distance your 20cm long subject will appear small. To focus closer one needs to use a diopter lens which will degrade the image as well as narrow the focusing range. If you are using a dome port all bets are off without a diopter since the bare lens can only focus beyond infinity. If you want to bring an f/1.4 lens on a dive trip (e.g. to shoot topside available light shots) a wide angle such as a 35mm f/1.4 would be better because they typically focus closer.



Personally I think its a bit much to write-off your 50/1.4 non-macro. Seems like a subject you could easily shoot with that lens, even if you can't focus down to macro levels.


So you won't get any closeup face or eyeball shots, sure. Does it mean you can't shoot less magnified images? Of course not.


Indeed a macro is more versatile but we often must work with what we have. I think both your 100 macro and 50/1.4 would be options. 

In Topic: What lens for canon FF for rhinopias

28 January 2018 - 02:44 PM

Great point. Here is where Nikon beats Canon infinity to zero. :crazy:

This above opinion is based on actual use as I own both the Canon 50/2.5 and Nikon 60 AFS. As well, the Canon 50 2.5 only focuses to 1:2 whereas the Nikon focuses to 1:1 without extending.



Maybe a better question would be what is a good 50mm macro lens with a fixed lens length for a canon FF. All the 50mm macro lens I can find change lens length with focus point. The Canon 50mm macro 2.5 is shown below.