Bounce focus tips??

Discussion in 'Lighting and Electrics' started by venuetech, Jun 7, 2011.

  1. venuetech

    venuetech Well-Known Member Departed Member

    Messages:
    1,453
    Likes Received:
    371
    Occupation:
    aud man out
    Location:
    AK,
    A speed square is usualy hanging around. I taped a string with a small weight onto the back side

    [​IMG]


    with the electric at spike you can stand at the desired focus point, and line up the fixture with the back of the square. make note of the angle

    [​IMG]

    fly the electric in to a working hight then pan the fixture to line up with the focus point, then set the angle to match your notes.

    [​IMG]

    this could work with a protractor
     
    Last edited: Jun 7, 2011
  2. derekleffew

    derekleffew Resident Curmudgeon Senior Team Premium Member

    Messages:
    4,831
    Likes Received:
    3,428
    Location:
    Las Vegas, NV, USA
    [user]venuetech[/user], I suspect there are supposed to be pictures attached to your post. Further, it sounds as though you've made your own inclinometer, and then followed the directions in the article (which, BTW, was written by CB member [user]dwt1[/user], Dana Taylor) referenced in the wiki entry bounce focus.

    In any case, it's a great idea.
     
  3. venuetech

    venuetech Well-Known Member Departed Member

    Messages:
    1,453
    Likes Received:
    371
    Occupation:
    aud man out
    Location:
    AK,
    Well I think I got the photos working.
    I did see Dana's page, the advantage to this is you have likely have a speed square hanging around the shop. a student likely has a protractor in his or her locker. Its a quick low cost solution.
     
    Last edited: Jun 7, 2011
  4. NevilleLighting

    NevilleLighting Active Member

    Messages:
    146
    Likes Received:
    9
    Location:
    Wichita, KS
    Wow, what a great idea. I have a show loading in next week that will probably have at least 120 units over platforms that I can't get a lift to. Considering focus tracks but I really hate them for safety reasons.
     
  5. Footer

    Footer Senior Team Senior Team Premium Member

    Messages:
    9,570
    Likes Received:
    2,061
    Location:
    Saratoga Springs, NY
    I want a picture of Max's face when you tell him what you are planning to do for focus...
     
  6. MrsFooter

    MrsFooter CBMod CB Mods Premium Member

    Messages:
    352
    Likes Received:
    265
    Location:
    Saratoga Springs
    So what do you do for shutter cuts? Personally that's the part I find the most challenging when bounce focusing. Placement I can usually get on the first try, but it's the shutter cuts I end up futzing with.
     
  7. derekleffew

    derekleffew Resident Curmudgeon Senior Team Premium Member

    Messages:
    4,831
    Likes Received:
    3,428
    Location:
    Las Vegas, NV, USA
    VL1000, VL3500 Spot, MAC 2000 Performance. ;)
     
  8. venuetech

    venuetech Well-Known Member Departed Member

    Messages:
    1,453
    Likes Received:
    371
    Occupation:
    aud man out
    Location:
    AK,
    Add Bounce.


    I really have only used this once or twice as it just occurred to me when I was fiddling with a speed square on stage one day.

    for all i know there could be a inclinometer app for your iPhone, so you could do the same thing with your phone.
    my phone just talks to me.

    David; I would think that focus tracks would be the way to go with that many units. It is the only proven way you can be assured of quickly getting the desired results.
     
    Last edited: Jun 11, 2011
  9. chausman

    chausman Chase Premium Member Fight Leukemia

    Messages:
    3,002
    Likes Received:
    252
    Location:
    Spokane, WA
    Yes, there is an app for that! Free Level

    Or there are more in the app store that you can pay for that do more things.


    Sent from my iPad using Tapatalk
     
  10. RyanC2186

    RyanC2186 Member

    Messages:
    1
    Likes Received:
    0
    Location:
    Pittsfield, MA
    Hey everyone! I recently became a part time TD for a local high school and I was wondering if any of you have tips for bounce focusing. I have a winch electric for my FOH position. No ladders will reach. Using a genie is out because the pipe is over the seating. The equipment is also incredibly old. StageBrite system installed in 1970 with no upkeep or maintenance. This winch takes 2-3 minutes to lower and 5-10 minutes and several students to raise. I can't think of anything but bringing it in and out over and over again until we get it right. Are there any tricks or ways to come close on the first shot? Any help would be appreciated! Thanks
     
  11. derekleffew

    derekleffew Resident Curmudgeon Senior Team Premium Member

    Messages:
    4,831
    Likes Received:
    3,428
    Location:
    Las Vegas, NV, USA
    In the wiki entry for bounce focus is a link to an article about one clever method, specifically for TILT. [The link is broken; I've notified the powers that be; here's hoping they fix it.] Basically it involves using a homemade sextant or inclinometer
    ([​IMG] or [​IMG] ,
    or a spirit level app for the iPhone) from the focus point on stage to the fixture at trim, to find the elevation, angle of, then using a protractor/inclinometer with the batten at low trim to manually set the correct angle of depression (same angle). Setting the PAN, or left/right, is that same no matter how high the luminaire. Shutter cuts will always be trial and error, wing and prayer tricky.

    The only "tip" that might lessen the number of trips a batten takes is to assign one student per fixture, and of course they'll get better with practice.
     
  12. AudJ

    AudJ Well-Known Member

    Messages:
    373
    Likes Received:
    112
    Occupation:
    Teacher
    Location:
    Upstate NY
    In addition, I have done the following for area lighting: Do some math, and make a miniature outline of your stage closer to the pipe on the same ratio as the stage, using the angle tools suggested by @derekleffew. Position fixtures within the outline as you would on stage when the pipe is lowered. This does work for shutters and similar adjustments, but again, not perfect, and might require a redo. I have only used this with bars above the stage, so your challenge would be to create a scale flat area, presumably over your seats or pit. Maybe with a tarp or other removable object you can consistently replicate positioning once the math is all completed.

    This does not work for lighting verticals, but it can be a help for approximating scenery and objects if you have a scale model of the stage.
     
    Last edited: Dec 6, 2015
  13. Les

    Les Well-Known Member

    Messages:
    4,111
    Likes Received:
    921
    Location:
    DFW, Tx.
    Also, schedule a rigging inspection!
     
  14. kicknargel

    kicknargel Well-Known Member

    Messages:
    1,294
    Likes Received:
    444
    Location:
    Denver, CO
    As an option, sometimes a Little Giant Skyscraper ladder can get you to hard-to-reach positions. They can be used on a rake and can often straddle seats. Not cheap, however.

    https://www.littlegiantladder.com/skyscraper/
     
  15. JohnD

    JohnD Well-Known Member Fight Leukemia

    Messages:
    2,802
    Likes Received:
    1,242
    Location:
    north central OK
    This may be old news to many here, but looking at the exhibitors list for USITT 2016 there was this company:
    http://lightbulbscaffold.com/
     
    jonliles likes this.
  16. JonathanHarpur

    JonathanHarpur Member

    Messages:
    67
    Likes Received:
    20
    Occupation:
    Theatre Technician
    Location:
    Fredericton, New Brunswick, Canada
    Also, and this may be obvious for the seasoned yo yoiste: For easy adjustments of beam edge at the ground, find an object that's a comparable distance to your throw distance from you, and adjust for focus on that, and then go for any pan/tilt/shutter adjustments as needed. You could actually calculate the distances and measure things out, but with a bit of practice, roughing it in is accurate enough, even for gobos.
     
  17. sk8rsdad

    sk8rsdad Well-Known Member Premium Member Fight Leukemia

    Messages:
    2,435
    Likes Received:
    1,087
    Location:
    Ottawa
    Adding to @JonathanHarpur 's post, this is a great opportunity to put all the stuff the students learn about similar triangles and ratios of sides into practice. All the angles are constant, one of them is a right angle.

    If your batten trim height is consistently 2m for focus (or some other readily reachable height) and the trim height when flown is constant (say 8m for this example), then the ratio is constant (4 in this case). You can build a custom ruler scaled accordingly.

    The catch is tilt and pan needs to be set for each fixture using the scale, measuring out then over. As the batten goes up the focus of each instrument is shifting in 2 dimensions. If you want to focus 2 fixtures to the same spot at high trim, they won't look like the same spot when at low trim.
     
  18. mikeydoesstuff

    mikeydoesstuff Active Member

    Messages:
    101
    Likes Received:
    15
    Location:
    Cincinnati OH
    The last place I worked, we installed a permanent focus chair track with a removable chair for this exact problem. Works great, needs an adult on hand and constant/consistent safety training, but I loved it. Out biggest complaint was the max weight on person-in chair, because often the long armed types were close or over the 200lb limit.
     
  19. venuetech

    venuetech Well-Known Member Departed Member

    Messages:
    1,453
    Likes Received:
    371
    Occupation:
    aud man out
    Location:
    AK,
    it is a great ladder but it is heavy. almost 100lbs a crew of 3 to stand it up.

    A speed square with a string can be made to work
    [​IMG] [​IMG]

    but these days you can get a clinometer app for your phone or pad and use that.
    just glow the filaments

    even if you have a 6' ladder that you can get into position that may save time cranking down and cranking out.
     
  20. kicknargel

    kicknargel Well-Known Member

    Messages:
    1,294
    Likes Received:
    444
    Location:
    Denver, CO
    I have often done it by myself, although not by the recommend procedure. And it's not a lot of fun.
     

Share This Page

  1. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
    By continuing to use this site, you are consenting to our use of cookies.
    Dismiss Notice