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prefocus

Discussion in 'Wiki' started by derekleffew, May 18, 2009.

  1. derekleffew

    derekleffew Resident Curmudgeon Senior Team Premium Member

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    (Literally, Pre Focus.) A type of socket and lamp base designed so that the lamp can only be seated in one orientation. This was more important with the planar filaments of pre-TH lamps (as T/H lamps tend to have symmetrical filaments), but the base type remains and is primarily used today with the BTL family of lamps in most 6" Fresnels.

    A medium prefocus (p28s) socket. Notice the slots for two different sized fins.
    [​IMG]
    Medium Prefocus Lamp Socket was also the standard socket in most radial ERS s, such as Altman 360.

    See this thread: http://www.controlbooth.com/forums/...el-lamp-base-problems.html?highlight=prefocus.

    A mogul prefocus (p40s) socket
    a580001lg.jpg
    used for 1000-2000W lamps. The 1000W BVT of the Altman 75Q 8" Fresnel, the 1500W DTA/DTJ of older incandescent followspots.
     

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