Well, I spent more time today again playing with bubbles.....this stuff is addictive! I shot a lot of images but came out with only four that were worth processing; one is in the POTD thread and I'll plop the others down in here. Whatever it is I am doing it obviously is not the same technique that is used to get that "colorful bubble planet effect," but next time I'll try yet another strategy.
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Bubbles Within Bubbles
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As @deep diver suggested you have too much light coming through the bubble. The effect you are after is there but is swamped by ambient. The patterns are caused by light interference by reflection from the very thin layers that make the wall of the bubble. If the only light is reflected from the bubble surface then the colours and pattern will be strong. On the other hand if most of the light is by transmission then there will only be a weak pattern and colours. @deep diver arrived at the formula I suggested in the original post so it must be right 😀I had some trouble as well. The only thing that worked for me is minimal ambient light, the camera parallel to the table top, and the light box about 6 inches above the bubble.
I used a zoom lens at about 135mm. I'm going to use a longer lease next time so that I can minimize the cropping. I left a lot of pixels on the cutting room floor.
I think that artifact was a piece of masking tape on the parchment paper. I took it off and I'll find out next time.