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Alex_Mustard

Member Since 16 Jan 2003
Offline Last Active Yesterday, 04:08 AM
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Posts I've Made

In Topic: 140mm minidome on Nikon D750 FX format

14 December 2014 - 11:48 AM

I would recommend shooting this dome on FX at f/14 with a fisheye lens. If you can. If you have enough light etc.

 

If you have to open up, say to f/10, you will loose corner sharpness. If you are shooting a subject in open water - with nothing but blue in the corners of the frame - then this is not an issue. But in other situations you should be aware of the compromise to image quality - and consider this in your composition. 

 

Alex


In Topic: Long exposure time/night dive/painting with light

14 December 2014 - 01:51 AM

Here are some examples on other subjects:

 

RS13_am-13875.jpg

 

And me at work:

 

rsw13_03.jpg

 

And using a narrow beam!

 

1016567_264899240336393_1915081722_n.jpg


In Topic: D750 or D810 for underwater photography?

14 December 2014 - 01:42 AM

Those interested in this topic should read here too:

http://wetpixel.com/...auticam-na-d750

 

Conclusion: 

http://wetpixel.com/...icam-na-d750/P4

 

Alex


In Topic: 140mm minidome on Nikon D750 FX format

12 December 2014 - 12:52 AM

While it is hard to argue against such a stunning set of images - I do think that the lack of corner sharpness that comes from opening the lens up is evident even at this file size.

 

For example the detail in the reef is blurring out in the top shot (taken at f/9) in the top corner. This does not stop the image working or being eye-catching, but if you were able to shoot at f/14 this would be sharp. I would warn against shooting the 140mm dome with a fisheye at wider than f/10, unless you know the compromises that brings.

 

Anyway, very nice images!

 

Alex


In Topic: Thinking about acquiring a viewfinder

09 December 2014 - 10:30 PM

I agree with David’s point. Unless you are shooting all the time underwater it is not a good idea to be switching back and forward between the two. I really know the angle between my 45 degree viewfinder and my handle and when shooting super macro I can just aim it and I find my subject exactly where I am expecting - none of that hunting around. 

 

Even when I switch to another housing with a 45 degree finder I am not as accurate with this aiming. There is a lot to be said for getting one option and sticking with it. 

 

Alex