DTR
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- Joined
- Jun 24, 2010
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I don't know much about beam expanders but you say the beam needs to be slightly defocused when you go into the expander for it to work right? My first thought is are you trying both unfocused(pre focus) and overfocused(past focus). If you are prefocus maybe you are getting some light hitting the rim of the lens barrel but if you are past focus and closer to the diode it may clear that up. Just a thought.