They just placed the camera at a distance to either use forced perspective or a set of scaled size to achieve the effect. NOTE: This unit is opened and closed with the use of a 26v electric motor / actuator.
Please have a experienced electrician hook this unit up to power / control box.. Otherwise you may burn or short the electronics out which may be costly and be an all round bummer.. I used a simple 24v dewalt battery to open and close it for the pictures. You will probably want to add an AC or DC power supply with a rheostat and a switch for forward and reverse motor control. The Iris opening is 7.Add the movie prop bump and a few dollars more. I included the screen captures from Aliens as an example of the use fo this type of iris in Hollywood films. The item "Motorized Iris Diaphram Film Movie Prop / Rotary Actuator / Sci-Fi/ as Aliens" is in sale since Saturday, January 4, 2020.
This item is in the category "Entertainment Memorabilia\Movie Memorabilia\Props\Originals". The seller is "feed-my-dogs" and is located in Las Vegas, Nevada. This item can be shipped to United States, United Kingdom, Denmark, Romania, Slovakia, Bulgaria, Czech republic, Finland, Hungary, Latvia, Lithuania, Malta, Estonia, Australia, Greece, Portugal, Cyprus, Slovenia, Japan, China, Sweden, South Korea, Indonesia, Taiwan, Thailand, Belgium, France, Hong Kong, Ireland, Netherlands, Poland, Spain, Italy, Germany, Austria, Bahamas, Israel, Mexico, New Zealand, Singapore, Switzerland, Norway, Saudi arabia, United arab emirates, Qatar, Kuwait, Bahrain, Croatia, Malaysia, Brazil, Chile, Panama, Jamaica, Bangladesh, Brunei darussalam, Bolivia, Ecuador, Egypt, French guiana, Guernsey, Gibraltar, Guadeloupe, Iceland, Jersey, Jordan, Cambodia, Liechtenstein, Luxembourg, Monaco, Macao, Martinique, Nicaragua, Peru, Pakistan, Paraguay, Viet nam, Uruguay, Canada, South africa, Colombia, Barbados, Bermuda, Cayman islands, Sri lanka, Maldives, Oman, Reunion, Philippines, Ukraine.