Reflections in dome ports

There have been some posts regarding this topic in past so I appologise in advance. I have had some problems with reflections showing up in images when using dome ports. Some of the reflections come from the front of the lens (white lettering in the image) which I have fixed after reading some of the other posts on this topic. However, I still get the occasional reflection of the port body (or neck) and flat surface. Can anyone help me resolve this problem?

Cheers

Hugh

Maybe, thin black felt (anything with a flat black finish) applied with double-sided tape to the inside of the port body.

Take Care,

ChrisS

Maybe, thin black felt (anything with a flat black finish) applied with double-sided tape to the inside of the port body.

 

Take Care,

ChrisS

I use a 8" Aquatica dome without the exterior dome shade but I use B+W 77mm Screw-In Folding Rubber Wide Angle Lens Hood #920, which pops into place after the lens barrel is inside the dome. Never had any more problems with internal reflections. You can cut away a small part of the hood so that you can use it with a 12-24 without having corner problems.

i use the wide angle dome shad with my 10-22 and it has fixed the problem for the most part every once and a wile i will still get a pic with a reflection in it but that is the nature of an acrylic ports.

Hugh, take a read of this thread and link from Stephen Frink.

http://wetpixel.com/forums/index.php?showt...p;hl=reflection

I'm new to this and thought this topic would be worth revisiting. I'm currently having a similar problem with dome port reflections popping up. My setup is a Nikon D80 in a Nexus housing and the problem occurs when using the 10.5mm FE lens and 8" dome port.

I think my case differs slightly. While other posts have reported reflections of the concentric rings and/or lettering on the front of the lens, my reflections are that of the focus ring and the gold band on the barrel of the lens.

My strobes are connected via fibre optic cable and is therefore triggered by the camera's internal flash (set on iTTL).

I've figured out that the reflections are a result of the light from the internal flash bouncing in and around the housing, lighting up the barrel of the lens and therefore reflecting off the dome port and back to the lens of the camera. (I hope that made sense)

I've tried the following:

1. Covering the barrel of the lens with a black non-reflective t-shirt fabric. As a result, the fabric is lit and instead of getting the focus ring reflection, I got a fabric reflection!

2. Winding down the built-in flash to its lowest manual setting to trigger the strobes (Inon Z240 III) and adjust the strobe output manually. Worked very well to eliminate the reflections, but the strobes then didn't function properly!! I don't quite understand why, but I believe the strobes work based on the iTTL signal from the camera's in-built flash. I tried adjusting the strobe output manually, but it kept firing at the same low output at different settings. Need some clarification on this strobes functionality.

3. Cut out a circular shape of cardboard to fit over the lens to block any light from passing through to the port. Built-in flash was set to iTTL again. In this case, the strobes worked as designed, but there was still a little bit of light that managed to get through and this caused a reflection as well.

After trying and trying, I'm still frustrated with not being able to eliminate the reflections whilst maintaining full functionality of the strobes.

Wondering if anyone else has experienced this problem with the in-built flash and reflections. Any help would be appreciated.

I have experienced reflections from the gold banding using a compact point and shoot Nikon in an Ikelite housing and got around the problem by taking to it with a black marker pen. Since posting my original comment I have done the same to my Canon lenses and fitted a piece of black felt in the dome port and problem solved. However, this is a good fix if you are prepared to rub black permanent marker over the front of the lens body.

Thanks to all who have posted

I'm new to this and thought this topic would be worth revisiting. I'm currently having a similar problem with dome port reflections popping up. My setup is a Nikon D80 in a Nexus housing and the problem occurs when using the 10.5mm FE lens and 8" dome port.

 

I think my case differs slightly. While other posts have reported reflections of the concentric rings and/or lettering on the front of the lens, my reflections are that of the focus ring and the gold band on the barrel of the lens.

 

My strobes are connected via fibre optic cable and is therefore triggered by the camera's internal flash (set on iTTL).

 

I've figured out that the reflections are a result of the light from the internal flash bouncing in and around the housing, lighting up the barrel of the lens and therefore reflecting off the dome port and back to the lens of the camera. (I hope that made sense)

 

I've tried the following:

 

1. Covering the barrel of the lens with a black non-reflective t-shirt fabric. As a result, the fabric is lit and instead of getting the focus ring reflection, I got a fabric reflection!

 

2. Winding down the built-in flash to its lowest manual setting to trigger the strobes (Inon Z240 III) and adjust the strobe output manually. Worked very well to eliminate the reflections, but the strobes then didn't function properly!! I don't quite understand why, but I believe the strobes work based on the iTTL signal from the camera's in-built flash. I tried adjusting the strobe output manually, but it kept firing at the same low output at different settings. Need some clarification on this strobes functionality.

 

3. Cut out a circular shape of cardboard to fit over the lens to block any light from passing through to the port. Built-in flash was set to iTTL again. In this case, the strobes worked as designed, but there was still a little bit of light that managed to get through and this caused a reflection as well.

 

After trying and trying, I'm still frustrated with not being able to eliminate the reflections whilst maintaining full functionality of the strobes.

 

Wondering if anyone else has experienced this problem with the in-built flash and reflections. Any help would be appreciated.

I have learnt that only the infrared part of the flash light is needed for triggering the remote flashes. There are some films in the market (such as those from Inon) that block the visable light from the camera flash only allowing infrared to pass. This hopefully could solve the problem.

Hugh and PhishSense,

Hi Guys,

I custom installed Inon fibre optic windows into my Nexus D70S housing and was also worried as to reflecting light bouncing all around the place inside the housing.

I spoke with Carey at SeaOptics in SA and he suggested the Inon clear film that is used for the compact cameras. As Edward said, this film blocks out the normal 'bright' spectrum light and only lets the infra red stuff through that is necessary to trigger the Inon strobes. Very clever people at Inon! Anyway, I tried it and problem solved...

I notice that Nexus now also produces a reflective mirror for the inside of their housings. The idea of this is to reflect all the light from the internal flash towards the fibre optic ports so as to guarantee consistent firing of connected strobes... More great ideas from The Orient...

HTH,

Bruce...

Apparently, it was only a problem when shooting in the aquarium. At least, i did not seem to notice the ring in any of my ocean pictures!