I have 6 ETC Source Four Zooms (15-30 degree). One unit in particular is giving me problems maintaining the sharp/soft focus of a template once it is inserted. For example - the gobo I was using was focused as sharp as it possibly could be, matching its counterpart. When the light first came up, the focus was fine. But after about 1 minute of being on (at about 60% intensity), the gobo lost its focus and would soften out. The other unit maintained its focus, so this obviously was a very noticeable issue.
Once the light was off for a scene, it would go back to its original focus when it was brought up again, but just as before, would lose its focus after about 1 minute of being on.
I swapped the unit out for another working zoom, and when I opened up the problem unit, I couldn't see anything visibly wrong. Has anyone else had this issue? I'm pretty certain it is some kind of heat issue, I just can't figure out exactly what.
Once the light was off for a scene, it would go back to its original focus when it was brought up again, but just as before, would lose its focus after about 1 minute of being on.
I swapped the unit out for another working zoom, and when I opened up the problem unit, I couldn't see anything visibly wrong. Has anyone else had this issue? I'm pretty certain it is some kind of heat issue, I just can't figure out exactly what.