Olympus TG-7 with Olympus Circular Fisheye Converter FCON-T02

[GrtDay]

2 pics at 12 inches.

First is standard with Olympus Circular Fisheye Converter FCON-T02.  As  you can see, there is a huge circle of black around the Ikelite housing.  (I know...it needs some lightening but the issue is the back circle.

Second is using the camers's zoom removing the black surround.  Same shooting distance but without the black surround.

 

I've taken this camera on 1 dive trip and found the black circle to be incredibly distracting.  Yes, I know I can use the zoom function and then use PhotoShop to manipulate the image. 

Needless to say, the Ikelite housing has a dome for this wide-angle application.

 

Question:  Should I place camera with Fisheye into the housing and dive, zooming into the image and removing the circular black. 

Seems like imaging would suffer from the zoom in.

 

I'm an accomplished DSLR photographer but this little system has me puzzled!

 

Thanks to all in advance!

[humu9679]

It looks like that port isn’t matched for the FCON-T02.  The lens sits too far back, hence the image. I’m not sure I’d even call that a vignette. 
 

Can you photograph the camera with the conversion lens and the set up that vignettes so much? A grab shot with your phone will suffice. 
 

craig

[shokwaav]

https://www.ikelite.com/blogs/reviews/olympus-fcon-t02-circular-fisheye-and-tough-tg-6-underwater-photos

It seems that the extreme vignette is an expected result from this combination?

[GrtDay]

8 hours ago, shokwaav said:

https://www.ikelite.com/blogs/reviews/olympus-fcon-t02-circular-fisheye-and-tough-tg-6-underwater-photos

It seems that the extreme vignette is an expected result from this combination?

an excellent reference.  Thanks!

[humu9679]

10 hours ago, shokwaav said:

https://www.ikelite.com/blogs/reviews/olympus-fcon-t02-circular-fisheye-and-tough-tg-6-underwater-photos

It seems that the extreme vignette is an expected result from this combination?

 

I stand corrected. Yes, that is apparently what you are getting: a circular fisheye image. Not much to do about that.

[Chris Ross]

It's called a circular fisheye adapter for a reason, it produces a circular fisheye image, just like a Canon/Nikon 8-15mm at 8mm will on a full frame camera.   It's should be about a full 180° field all around

Zooming is perfectly fine I wouldn't expect any image degredation apart from the fact the lens aperture decreases a little as you zoom.  When you zoom in until it just stops the vignette you should have something like the field of view of  a 180° diagonal fishete like an 8-15mm at 15mm on full frame.