1.4TC with 10-17 and 230mm dome
Posted 15 January 2013 - 12:47 PM
Two weeks until we leave for our Socorro-Hawaii trip. I read everyone's posts over the last few years on Blackwater diving set ups (twice). Great info. I am very happy to have this library of info to study beforehand.
I am on the fence between using my 60 or my 10-17 with a 1.4x TC. Query for you on the Tokina-TC set up:
If I get a 1.4TC and use it with my shaved 10-17, can I use my 230mm dome? Normally I use the 10-17 with this dome, but I am wondering if the optical maths don't work if I add the TC. I have a 35mm extension ring so I can put the outer glass on the 10-17 in the same place after adding the TC as before. Trying to avoid buying a minidome since I don't have that many opportunities to use it.
Thanks for your thoughts.
Posted 15 January 2013 - 11:28 PM
Based on my experience with DX cameras you should be able to do this as long as you use the longer extension behind the dome. I've done this with my 200mm Subal dome and 10-17 on a Kenko 1.4X teleconverter and it worked fine. However, you won't achieve the full magnification potential of the combination behind such a large dome as your dome will hit the subject well before you get to minimum focus distance. I get much higher magnification with this lens combo behind my Zen 100mm dome than with the 200mm Subal dome. This article by Alex Mustard explains why about half way down:
If I get a 1.4TC and use it with my shaved 10-17, can I use my 230mm dome?
Edited by Gudge, 15 January 2013 - 11:29 PM.
Canon 7D MkII, Nauticam NA-7DMKII housing, 2 x Inon Z240, 2 x Ikelite DS160, Tokina 10-17, Canon 60 & 100 macro, Sigma 150 macro, Kenko 1.X Teleconverters.
Posted 16 January 2013 - 01:34 PM
I think that I am going to pick up a 1.4TC and give it a go. I like the option of this type of shooting over tighter macro with my 105 and 60. I remember Alex commenting that to him, places like Lembeh are a bit more about the bigger picture (what is around the interesting critter).
I reckon its a slippery slope, so it won't be long before I buy a minidome....