Japanese manufacturer, Ohira Tech Ltd., by Takayuki Ohira (Kawasaki), since 1998.

- 1985: first prototype pinhole (first High School year)

- 1986: prototype "squirrel film" ? (second High School year)

- 1991: prototype (Astroliner)

- 1998: Megastar 1 (1.5 million stars, IPS London)

- 2003: Megastar-I Phoenix (4.1 million stars, first time: closing event of Tokyu Bunka Kaikan (ex Goto planetarium)

- 2004: Megarstar-II Phoenix (Kawasaki City Youth Science Museum) ?

- 2004: Megastar-II Minerva

- 2004: Megastar-II Cosmos (5.6 million stars, National Museum of Emerging Science and Innovation)

- 2005: Megastar-II Titan

- 2006: Megastar Zero (LEDs)

- 2008: Super Megastar-II (22 million stars, announced at the IPS Chicago)

- 2009: Megastar-IIB (first permanent LEDs model for medium dome) at Atsugi Children's Science Museum

- 2010: Megastar-IIA (first LEDs model for large dome) at Yamanashi Pref. Science Center

- 2010: First overseas unit: Megastar-IIB in Nehru Planetarium, New Delhi

- 2012: Megastar-III Fusion (42 million stars) at Kawasaki Municipal Science Center

- 2012: Megastar-IIB Fusion

- 2013: Megastar Jr

- 2015: Gigamask (with Sony DADC Japan: ultra-precision stellar plate: 1 billion stars)

- 2016: Megastar Class

- 2016: Nano Dimmer

- 2017: Megastar Neo

- 2018: Giganium (for 500m dome? Where?)

- 2019: projection (Giganium) on the 200m dome of the Seibu dome (MetLife Dome)

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Megarstar-I

- 2009: Sakado, Saitama, Japan