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Gudge

Member Since 16 Oct 2005
Online Last Active Today, 08:36 PM
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In Topic: switching from autofocus to manual focus underwater?

15 April 2015 - 05:26 PM

I guess i should specify too, is there an accessory, that I can buy for my nauticam, that allows me to physically move the af/mf switch on the lens?

No, the placement of the AF/MF switch is such that the manual focus gear covers the switch making it inaccessible.


In Topic: switching from autofocus to manual focus underwater?

15 April 2015 - 03:53 PM

This is how I do it with both my 7D and 7D MkII in Nauticam housings:

 

I setup one of the custom mode settings (there are three on the 7Ds mode dial but only one on the 70D) so that Metering Start only is assigned to shutter release at half press.  When I want to shoot with manual focus I switch to this mode so that I can focus manually and when I press the shutter release AF will not occur.  Note that you can always do auto focus in this mode by using the focus now button on the back of the camera.  When I want to go back to normal shooting I just turn the mode dial back to the setting I normally use (Manual) so that AF is once again possible with a half press of the shutter release.


In Topic: Using a teleconverter

22 March 2015 - 11:45 PM

Using a short extension tube has been used to get around this problem, but make sure it will accept EF-S lenses.  I have a Kenko set that does but there are others out there that don't.

 

Autofocus will still work but will be slower than normal due to smaller apparent aperture caused by both teleconverter and extension tube limiting light for autofocus.

 

The other thing to consider is that once you fit an extension tube the maximum working distance will be somewhere short of infinity.


In Topic: Using a teleconverter

22 March 2015 - 12:48 PM

The Canon 60 macro is an EF-S mount lens.  All the non-Canon teleconverters I have (Tamron and Kenko) only accept EF mount lenses and won't accept EF-S lens.


In Topic: Is it possible to test a wet lens above water?

17 March 2015 - 02:29 PM

 

 

Can I test a Subsee macro lens on my housing without getting in the water?

Yes.  The Subsee's have flat glass elements at both ends and have the same power in air and water.  Other wet close-up lenses which have curved glass elements in contact with the water will yield very different results when used in water and air.