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DrMark

Member Since 25 Feb 2006
Offline Last Active Aug 01 2012 08:50 AM
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Posts I've Made

In Topic: Pelican Case for Dome Port

19 July 2012 - 12:59 PM

I have an Ikelite 8" dome port with the extender for a Tamron fisheye lens.


I have this dome port on order, and am looking for the same solution. Can you tell me the deminsions of the port (I know it is 8" in diameter, what is the other dimension)?

Thanks,

--Mark

In Topic: Sony SLT-A65, Bigger than a NEX!

16 July 2012 - 06:44 AM

My research has also lead me to the Sigma 8-16.

--Mark

In Topic: Sony SLT-A65, Bigger than a NEX!

15 July 2012 - 02:38 PM

I wasn't so much wondering about switching between auto and manual focus, but rather just being able to force the camera to hold the current focus from within auto focus. So, for example, if I see a whale in the distance, and it happens to be in focus, I want to be able to turn off the auto-focus so that it doesn't continue to focus hunt. I think they call this "focus hold", but from the on-line documentation, it is hard to tell exactly what it does.

--Mark


I went to a local camera store yesterday and played around with the Sony a65 some. I was able to verify that it *is* possible to hold the focus on video when in auto focus mode. In the camera menu, you can map any of a number of functions to the AEL button. One of those features is "focus hold." As long as you depress the button, the auto focus will hold its current focus point. I wish it were a toggle, but this is better than nothing. So, if you see a whale swim by, you can hold down the AEL button and shoot away, not having to worry about the camera focus hunting on you.

--Mark

In Topic: Sony SLT-A65, Bigger than a NEX!

08 July 2012 - 03:50 PM

For most lenses in the Ike housing there is no manual focus option, so there is no way to switch between Auto and Manual.


I wasn't so much wondering about switching between auto and manual focus, but rather just being able to force the camera to hold the current focus from within auto focus. So, for example, if I see a whale in the distance, and it happens to be in focus, I want to be able to turn off the auto-focus so that it doesn't continue to focus hunt. I think they call this "focus hold", but from the on-line documentation, it is hard to tell exactly what it does.

--Mark

In Topic: Sony SLT-A65, Bigger than a NEX!

07 July 2012 - 09:36 AM

How did you find the focusing with the A65 to work underwater? I have recently learned about some serious limitations with the A65 auto focus in video mode, and I don't think you can both manually focus and zoom in an Ikelite housing. The feature I'm most worried about is the ability to hold focus with video to keep the camera from hunting in poor visibility.

I would appreciate any advice you can give on this.

Thanks,

--Mark