On several occasions, I have found it useful to hang Source Fours with no barrels in them. At a glance, this appears to produce a circle of light roughly equivalent to that of a Source Four with a 36 barrel, only without the easy ability to shutter, gel, or focus the edge. I don't know exactly, but I'd like to. Are there any specs on the beam and/or field angle of a Source Four devoid of a barrel?
Thanks anyone who knows!
I don't have an answer to your question. I can't find the mirror's focal length published anywhere.
It should be pointed out that the manual says "Do not operate the fixtures without a lens installed". I suspect the UL rating is a fond memory if the bits from an exploding lamp aren't retained by the lens.
In reply to sk8rs_dad:
Good point. Maybe I'll fashion a diaper of mesh or R00 next time.
I just run out of wide lenses and PARs awful fast, so if all I need is NC wash for house lights or lightning flashes, no barrel is better than a 10 or a 19.
Thanks for your input.
In reply to Jodaco:
Source4s with no barrels over a house full of patrons is very much against code. As well as the physical containment of the lamp, there might be a UV/IR filter on the lenses that you are losing.
In reply to Xander:
I would suggest that the circle of light you're getting is just the cut-off from a combination of the gate or the end of the barrel. I also agree with the others that running the lamp without a lens is both a hazard from flying glass and UV radiation.
In reply to Andrew Bruton:
With all respect to whichever of my valued coworkers you might spoke to: "Do not operate the fixtures without a lens installed". As noted above , this is a safety risk. (I'm also assuming a tungsten lamp BUT the safety warning is also included in the Source Four LED User Manuals)
In reply to ueliriegg:
In reply to mmeskill: