How do I avoid a lens flare when using the BigEye Lens?
The lens flare encountered with the BigEye Lens when a light source is pointed directly towards the lens does not have to do specifically with the BigEye Lens, but with almost any dome port made use of underwater. It is often encountered when using dome ports of any kind due to the reflection of the sun or the strobe. Professional photographers deal with the same issue when making use of DSLR dome ports as well.
The following techniques should be followed in order to avoid a lens flare:
1. It is always useful to make sure that the wings of the BigEye Lens are positioned in an angle that blocks the strobe's output, as well as the sun. If required, the angle of the wings can be adjusted by simply rotating them, making sure that they are blocking the sun and direct output of the strobe. Images in which the sun is captured can be usually taken during mornings or afternoons, when the sun is not as strong as during the day. In general, the sun will have a much softer and successful effect during those hours of the day and will also cause less of a flare.
2. Make sure that the strobe is not positioned towards the lens. When shooting a nearby subject, for instance, it is better to position the strobe a little bit in front of the camera housing rather than behind it (so the light doesn't reflect on the BigEye Lens), or if you choose to position the strobe behind the camera housing, make sure it's not pointed towards the lens, but a little bit tilted towards the side.