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Articles from the Old Site / Re: How to hang, focus, and strike basic lighting instruments
« on: Aug 02, 2013, 09:06 am »Focusing Fresnels:
- Follow steps 1-7 above.
- Loosen the wing nut on the bottom of the instrument. This allows you to slide the lamp back and forth within the casing, allowing you to control the size of the beam. Make your designer happy, and then retighten the wing nut.
- Follow steps 11-12 above.
Small hints:
1. At some Fresnels, the slider gets stuck when not moved over a long period of time. In this case, switch of the lamp, let it cool down, loose the nut and move the slider several times to both ends until it runs freely. Traditional light bulbs do not like beeing moved aprubtly when lit. (I have my own experience...)
2. Focussing Elipsoidal:
Sometimes, it is better to first set the shutters while the light beam is focused perfectly (borders of the shutters can be seen perfectly) and then "run the barell".
Just 2 Cent from a lighting guy working in Europe.