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ChrigelKarrer

Member Since 05 Mar 2010
Offline Last Active Today, 04:41 AM
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Posts I've Made

In Topic: 140mm minidome on Nikon D750 FX format

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


In Topic: 140mm minidome on Nikon D750 FX format

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!

 

Chris


In Topic: Affordable 4K underwater video with the Panasonic LX100

14 December 2014 - 06:31 AM

I personally think that the main difference is:

a) the size of the housing
b) the absence of changable lenses (and the correlated "problems" like having the wrong lens attached)

c) image quality with is undisputable better with the GH4 (especially using the Shogun for raw recording)

 

I would love to have the GH4 but as i have already the D800 both will be rather similar in size and as i wrote in

another tread; i need a small camera to tuck under my right armpit during my work as dive guide and Instructor when permited.

 

In this moment he LX100 is certainly the best option for 4K video in a compact housing and it seems that Nauticam made a great job

developing the new housing for the LX100.
Ikelite still build nice and affordable housings, but unfortunately they stick with their decision to not allow (where possible) to open/add

a internal strobe and so using optical triggered strobes.
Also they "overseen or understimated the need of switching to manual and macro during the dive and this is a serious issue/pita.

 

I tried to stow somehow the LX100 in my Canon G1X MKII  and G12 housings to do some basic and limited underwater testing but
the thicker lens barrel avoid to fit the LX100 inside both housings.

 

It seems that for this time the only way is to use a plastic bag "housing" as used in the red sea video posted a few days ago.

 

Chris


In Topic: strobes for wreck photo

11 December 2014 - 04:54 PM

René,

depend what camera and housing you have and how you will/can trigger them (optical or electrical)

The INON Z-240 gives you the option to use both and is rather powerful and most photographer use them also because they are sturdy and reliable.

 

Triggering them optically gives you the possibiliti to use them remote buying "cheap" bulk optical cable and run it far away.

For shorter distances you still can use them remote as the optical sensor of the Z-240 is very sensible.

 

For WA wreck i use sometimes 3 strobes, left - above center of housing - right, this gives with the SIGMA 15mm a 180° illumination without shadows and hotspots.

 

Chris


In Topic: Thinking about acquiring a viewfinder

09 December 2014 - 05:16 AM

Did you ever thought about a external monitor?
The solve problems with eye weakness and mounted on top of the camera make a nice big orientable viewfinder!
Chris