liquidair > To create a visbile reflection on the bottle I have used a black back drop and placed my white diffuser to right of the bottle and slightly behind it. The flash, triggered by a Canon ST-E2 infared trigger and set to 1/8 power is on a stand behind the diffuser. I have adjusted the bottle and flash position so the reflection of the light is visible in the flat surface on the side of this triangular bottle.
liquidair > This bottle is lit predominantly by the specular reflection off its right side.
liquidair > Here I have placed my diffuser directly behind the bottle and the flash zoomed to a narrow beam behind it. Exposure is set for the surface of the diffuser which is very bright, so the flash set to 1/128 power to allow an f/8 aperture.

The cross in the light pattern is created by the fresnel lens in the flash at close range. That cross pattern is less than ideal for most photographs so normally I would elimiate it by using double diffusion of my light source. That, however, substantially increases the complexity of the setup.

As a side note, the reason you pay good money for good quality softboxes is that they have an internal baffle specifically designed to smooth out any unevenness in the light source.
liquidair > This bottle has been back lit and is visible because refraction in the glass bends the view (like a lens) to make unlit portions of the background visible as a dark outline.
To create a visbile reflection on the bottle I have used a black back drop and placed my white diffuser to right of the bottle and slightly behind it. The flash, triggered by a Canon ST-E2 infared trigger and set to 1/8 power is on a stand behind the diffuser. I have adjusted the bottle and flash position so the reflection of the light is visible in the flat surface on the side of this triangular bottle.
liquidair > To create a visbile reflection on the bottle I have used a black back drop and placed my white diffuser to right of the bottle and slightly behind it. The flash, triggered by a Canon ST-E2 infared trigger and set to 1/8 power is on a stand behind the diffuser. I have adjusted the bottle and flash position so the reflection of the light is visible in the flat surface on the side of this triangular bottle.
To create a visbile reflection on the bottle I have used a black back drop and placed my white diffuser to right of the bottle and slightly behind it. The flash, triggered by a Canon ST-E2 infared trigger and set to 1/8 power is on a stand behind the diffuser. I have adjusted the bottle and flash position so the reflection of the light is visible in the flat surface on the side of this triangular bottle.
See photo in original gallery.

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