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Member Since 07 Nov 2004
Offline Last Active Jan 02 2015 01:32 PM

Posts I've Made

In Topic: Your Favourite/Best Image of 2014

02 January 2015 - 12:53 PM

Alex: congratulations on your marriage!


It is always a challenge to pick just one favorite shot! This year I had more than one candidate from the same day of shooting the most challenging local (i.e., location not requiring a plane trip or boat ride to get to) salmonine species to shoot, the Cutthroat Trout. Locally, this species is about three orders of magnitude less abundant than salmon. The alternate pic to the one chosen here is in my Christmas E-card (posted on another thread).

In Topic: Cold water problems

28 December 2014 - 12:16 PM

I see this same phenomenon when shooting in Alaska during the autumn when ambient tempertures, both water and air, are near freezing.  NiMH and to some extent Li batteries show reductions in capacity. One has to live with it, bring batteries to swap out, etc. The shorter day length makes this problem easier to deal with ;-> I typically plant my camera set-ups in a stream for multiple hours at a time; fewer hours as the season progresses.


BTW I have had zeroed out batteries (Seacam strobes have nifty battery charge indicators) show non-zero charge levels back at home after warming.

In Topic: Configuring a MacBook for Dive/Photography Travel

27 December 2014 - 12:02 PM

Steve, check out these two links:



Looks like there have been some recent price reductions probably due to the recent changes in exchange rate in our favor (for a change!).

I am also looking into the 13"MBP, what is particularly attractive is the long battery life as I will be using it quite a bit driving around the state without AC power (other than the vehicle)


do you have a good website for tracking Apple rumored upgrades?  I hadn't seen anything about the next gen air.

In Topic: Happy Holidays!

24 December 2014 - 07:35 PM

Merry Christmas!

In Topic: Full Frame SLR wide angle corrector port tests

21 December 2014 - 04:05 PM

The internal correction lens is essential and you can see it in the top picture. I had it measured in the summer and it is a non-standard lens, matched specifically to the port. I expect it has opposite colour dispersion properties too - but I don't know how to measure that. But I think I should get all the specs so it could be reproduced (if needed).


One frustration are the Zeiss 18mm and 21mm lenses are both 82mm filter threads.



Sounds like the internal lens was designed to screw directly onto the Compur type 38mm Biogon lens so ignore the series VIII bit I wrote above. 67mm filters sort of will fit the mount on the lens but have a different pitch so it is important to only do a partial twist of a filter (probably not advisable for an underwater application). The male threads on your internal correction lens, however, are more problematic. There are Hasselblad series 63 filter adapters that may use the same series VIII retaining rings as the lenses and so would have the same thread. I seem to recall this for the adapter to Bayonet 50 but I have not handled one in decades. One could be cannibalized....


The Sigma 20/1.8 also uses 82mm filters but focuses so close I have not had to use diopters - I have had good luck using this lens for both APSC and FF and the smaller Seacam wideport.