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Member Since 14 Jul 2005
Offline Last Active Jan 10 2018 10:48 AM

Posts I've Made

In Topic: Fisheye and wide angle advice

08 December 2017 - 10:31 AM

Because the Canon is more expensive!!  :)


I read a couple of reviews between the two that say that the Canon is a bit sharper. That may be imaginary, and even if so, it's probably negligible. Actually, since I plan on using it with the 1.4TC, the zoom function of the Canon should come in handy. That's really the only reason.


Plus I found my 8-15 used for about the price of the 15 new.

In Topic: Fisheye and wide angle advice

08 December 2017 - 09:25 AM

At any focal length < 14mm, you'll start to see black at the corners. You could shoot there, but you'd have to crop the shot afterwards.


This link shows how the image will look at various focal lengths:



I believe that with the 1.4TC, you will have a useful range of about 15 - 21 before you'd see the black corners.

In Topic: Fisheye and wide angle advice

08 December 2017 - 05:21 AM

I went through the exact same thing. I upgraded from the 7D with the Tokina 10-17 to the 5Dm4. I agonized over it for a long time and made myself (and others) crazy. I eventually sold the 10-17 and bought the Canon 8-15. I also went with the Nauticam 140mm dome. After reading Alex Mustard's article, I decided that 100mm would be a bit small. My concern was also that I didn't want to give up the CFWA. I just returned from my first trip with the new system, and the new port/lens will still focus with the subject touching the port. I think it's a great combination. The only downside, is that there really isn't any zoom with the 8-15; it's just a 15. You can shoot full circle at 8, but it's either that or 15. Ok, the other downside is that I had to spend a lot of money and then justify it to my wife! 


I kept my Kenko 1.4TC but haven't yet tried it underwater. I've played with the above water, and it seems to focus quickly and give sharp results with the 8-15 above water. I'm going to get the necessary extension ring and zoom gear so I can use the TC on my next trip, which will be a big animal trip.


I hope that helps. 

In Topic: best strobe arms

24 October 2017 - 03:37 PM


I like your solution... very simple and looks to be very effective. Thanks, for sharing.

Thanks! But after looking at those photos I was embarrassed and followed my original plan with the SS hardware. Much better.   :) I found little nylon finish washers that fit perfectly.

In Topic: best strobe arms

14 October 2017 - 04:44 AM

On a semi-tangential note... what have been people's experiences with the newer, fine thread ULCS clamps? I've never been thrilled with how tight I've had to crank down my clamps, to keep them from moving - especially with longer arms and some sporty dive conditions.... my thought is that the fine threads should allow significantly greater clamping force for any given torque on the knob....



I like my ULCS arms, but I agree that the clamps can be a bit tough to fully tighten or loosen. I made these handles quickly as a prototype (out of scrap Azek), but they work so well that I haven't improved them yet. I was planning on connecting them via SS screws in lieu of the zip ties, but I've used these for about 100 dives, and I kind of like them. I'm a Canon shooter so I don't mind the white. Nikon shooters will probably prefer black.  ;)