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140mm minidome on Nikon D750 FX format


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#1 Alex_Tattersall

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Posted 11 December 2014 - 08:31 PM

Hello all,
 
I’ve just come back from an Alex Mustard workshop in Raja Ampat where I was predominately using a 140mm minidome on the D750. I was using it with the Sigma 15mm and sometimes with the 1.4x Kenko teleconvertor. I have to say that it has changed the way I think about FX underwater as I love the practicality of minidomes but did not want to compromise on quality. I am very pleased with the corner sharpness of the 140mm even up to F7.1 with the Sigma 15mm. Here are some images taken with the minidome.
 
1. D750, Sigma 15mm, F9, 1/60, ISO 500, 140mm minidome
 
15353254264_d520ec8933_c.jpg
 
2. D750, Sigma 15mm, F11, 1/60, ISO 500, 140mm minidome
 
15974862612_c1740bd070_c.jpg
 
3. On peut s’approcher très proche au subjet avec le minidome
D750, Sigma 15mm, F11, 1/125, ISO 320, 140mm minidome
 
15949770106_bebdd4ed0b_c.jpg
 
4. Boo window, D750, Sigma 15mm, F9, 1/60, ISO 500, 140mm minidome
 
15974868122_7d1a7f8e51_c.jpg
 
5. Boo window, D750, Sigma 15mm, 11, 1/80, ISO 320, 140mm minidome
 
15355910763_4813bf2b97_c.jpg
 
6. CFWA with the Kenko 1.4x, D750, Sigma 15mm, Kenko 1.4x, F11, 1/80, ISO 320, 140mm minidome
 
15789794377_e60826a608_c.jpg
 
7. CFWA with the Kenko 1.4x, D750, Sigma 15mm, Kenko 1.4x, F9, 1/80, ISO 320, 140mm minidome
 
15949755566_dc7dc4d10f_c.jpg
 
8. Nemo school, D750, Sigma 15mm, 11, 1/80, ISO 320, 140mm minidome
 
15973538731_9fce5d3f97_c.jpg
 
I hope you enjoy seeing them even half as much as I did taking them. 

Edited by adamhanlon, 16 December 2014 - 05:06 AM.
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#2 Alex_Mustard

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Posted 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


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#3 JamesR

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Posted 12 December 2014 - 08:23 AM

Thank you for putting this together. Nice set of images and comments. 


-James
 

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#4 Alex_Tattersall

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Posted 13 December 2014 - 08:27 AM

Thanks Alex, much credit to your good self for the teachings and putting us in the right locations last week.


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#5 ChrigelKarrer

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Posted 14 December 2014 - 07:42 AM

 

I would warn against shooting the 140mm dome with a fisheye at wider than f/10, unless you know the compromises that brings.

 

Alex Mustard,

just to understand you right:
what compromises - beneath a slower speed - will a higher f/stop than f/10 bring?

 

Thanks!

 

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#6 Alex_Mustard

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Posted 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


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#7 spencerjb22

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Posted 14 December 2014 - 12:41 PM

Wonderful images Alex, looking forward to using this dome in the future.



#8 ChrigelKarrer

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Posted 15 December 2014 - 04:55 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

 

Ah ok, then i was misinterpreting your post.
I use the Hugyfot 127mm glass minidome with the Sigma 15mm on my D800 and it works fine with apertures f/9+ (as long there is enough light)

 

Chris


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#9 Gonzalo P.M.

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Posted 09 October 2018 - 09:25 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

 

Hi Alex,

Would you know to tell us until fstop could be used to have an acceptable sharpness in the corners with a Zen 170mm and a 230mm? I have to choose one to photograph wrecks in ambient light. Zen 170mm with M4 / 3 has been a very good choice. But now I'm going to use a sigma 15mm with Full frame

 

Thnaks

Gonzalo



#10 JackConnick

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Posted 10 October 2018 - 06:45 AM

I have used a 170mm Zen dome with FX for quite a while. On my D800 I could shoot at around f/9 with good results. On the D850 it needs more like a minimum of f/11, really a bit more as the camera has such super high resolution. I also found shooting the Kenko 1.4 TC to not work out at all like it did ont he D800. So I guess it somewhat depends what FX camera you're using...

 

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