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Celestron Founder Tom Johnson, 1923 – 2012

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13 years 3 weeks ago - 13 years 3 weeks ago #92811 by GLIESE 581G
Thomas J. Johnson, the creator of the modern Schmidt-Cassegrain telescope and the founder of Celestron, died early this morning (March 13, 2012), according to Celestron president and CEO Joe Lupica. Johnson was 89.

Celestron's Tom Johnson
Telescope visionary Tom Johnson poses with one of his early Celestron Schmidt-Cassegrain telescopes.
Celestron
He ranked among the most important figures shaping the last half century of amateur astronomy.

Johnson was in his early 30s when, in 1955, he used his World War II experience as a radar technician, and postwar employment in the electronics industry, to establish a company called Valor Electronics. Based in Gardena, California, Valor made various components for military and industrial customers, and by the early 1960s it had expanded to roughly 100 employees.

As Valor was growing, so too was Johnson’s own interest in amateur astronomy. After first purchasing 4-inch and later a 10-inch Newtonian reflector, Johnson then headed down a path followed by many amateurs of the day and turned to the hobby of telescope making. The first scope he made was an 8-inch f/4 rich-field Newtonian, soon followed by a 12-inch Cassegrain. Meanwhile, in 1960 he established an "Astro-Optical" division of Valor.

His next telescope project demonstrated that his telescope-making talent and energy would be truly formidable. This scope was a highly unconventional 18¾-inch Cassegrain, made to be transportable. To reduce the weight of the 3-inch-thick primary mirror, Johnson had a ribbed pattern sandblasted into the back of the glass blank. Six months and about $1,000 later, he had a fork-mounted scope that could be disassembled and packed into a car in about 15 minutes.

Johnson's first really ambitious creation graced the cover of the March 1963 S&T.
S&T
On July 28, 1962, he hauled the scope to the parking area atop Mount Pinos for its public debut at one of the Los Angeles Astronomical Society’s star parties. It made a big impression among the group’s advanced amateurs, who examined it in detail. The telescope was so noteworthy that it became the cover story of Sky & Telescope's March 1963 issue.

But it was another S&T article that prompted Johnson to change history. As he was finishing the 18¾-inch scope, Donald Willey published a seminal analysis of Cassegrain telescope designs in the April 1962 issue. Johnson was intrigued by the excellent off-axis optical performance of the Schmidt-Cassegrain design. Based on his experience building the 18¾-inch scope and a plan to use optics made to order by Perkin-Elmer Corporation, Johnson took the bold step of advertising a 20-inch multipurpose Schmidt-Cassegrain telescope, called the "Celestronic 20," in S&T’s January 1964 issue.

The Astro-Optical Division name quickly morphed to Celestron Pacific, a division of Valor. By December Valor was dropped, and Celestron’s ad introduced pictures of 4-, 6-, 10-, and 22-inch Schmidt-Cassegrain telescopes as well as mention of a 36-inch. But most of Celestron’s sales were for the 10-inch, which cost about $2,000 when outfitted with basic accessories.

Despite his initial arrangement with Perkin-Elmer, Johnson was soon making his own Schmidt-Cassegrain optics. A breakthrough came early on when Johnson created a method for mass producing the telescopes’ optically complex corrector plates. For this and other contributions to optics, Johnson was later awarded the Optical Society of America’s David Richardson Medal; he was one of only a few non-Ph.D. optical engineers to ever receive the honor.

In the late 1960s, Johnson and his colleagues speculated that the sweet spot of the market would be for a compact, quality 8-inch portable Schmidt-Cassegrain costing around $1,000. And unlike most telescopes of the day, it should be as photography-friendly as the technology of the time allowed. Johnson returned to the drafting table, and what emerged was the $850 “classic C8,” first advertised in S&T’s June 1970 issue. With a radically new orange and tan motif, the C8 was an overnight hit. It set the pattern for all the amateur Schmidt-Cassegrains that would follow in the coming decades from Celestron, its competitor Meade Instruments, and others.

Writes Celestron's president and CEO Joe Lupica: "Tom's innovative, pioneering spirit created a revolutionary method of mass producing an affordable Schmidt-Cassegrain telescope design, which allowed millions of amateur astronomers to pursue their passion for astronomy. Other notable achievements include a 1978 David Richardson Medal from the Optical Society of America, a 1993 Bruce Blair Medal from the Western Amateur Astronomers, and a 2009 Lifetime Achievement Award by the Small Telescope & Astronomical Society. Our hearts go out to Tom's wife and family and to all who were touched by his achievements and innovation."

For more about Johnson's life and how his optical innovations revolutionized amateur astronomy, see The Path of Light. Produced by Celestron two years ago, this 17½-minute documentary features interviews with Johnson and others who grew up using his telescopes.





Last edit: 13 years 3 weeks ago by GLIESE 581G.

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13 years 3 weeks ago #92816 by dave_lillis
Replied by dave_lillis on topic Re: Celestron Founder Tom Johnson, 1923 – 2012
as seen on sky&telescopes website,
didnt know there were 22 inch SCTs about the place : blink:

Dave L. on facebook , See my images in flickr
Chairman. Shannonside Astronomy Club (Limerick)

Carrying around my 20" obsession is going to kill me,
but what a way to go. :)
+ 12"LX200, MK67, Meade2045, 4"refractor

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  • SELECT * FROM `tifas_kunena_categories` WHERE `id` = '517'170μs4.66KB/libraries/kunena/src/Tables/TableKunenaCategories.php:295Copy
  • SELECT * FROM `tifas_kunena_categories` WHERE `id` = '3'112μs4.66KB/libraries/kunena/src/Tables/TableKunenaCategories.php:295Copy
  • SELECT * FROM `tifas_kunena_categories` WHERE `id` = '39'120μs4.66KB/libraries/kunena/src/Tables/TableKunenaCategories.php:295Copy
  • SELECT * FROM `tifas_kunena_categories` WHERE `id` = '33'111μs4.66KB/libraries/kunena/src/Tables/TableKunenaCategories.php:295Copy
  • SELECT * FROM `tifas_kunena_categories` WHERE `id` = '2'141μs4.66KB/libraries/kunena/src/Tables/TableKunenaCategories.php:295Copy
  • SELECT * FROM `tifas_kunena_categories` WHERE `id` = '40'110μs4.66KB/libraries/kunena/src/Tables/TableKunenaCategories.php:295Copy
  • SELECT * FROM `tifas_kunena_categories` WHERE `id` = '30'110μs4.66KB/libraries/kunena/src/Tables/TableKunenaCategories.php:295Copy
  • SELECT * FROM `tifas_kunena_categories` WHERE `id` = '45'110μs4.66KB/libraries/kunena/src/Tables/TableKunenaCategories.php:295Copy
  • SELECT * FROM `tifas_kunena_categories` WHERE `id` = '46'109μs4.66KB/libraries/kunena/src/Tables/TableKunenaCategories.php:295Copy
  • SELECT * FROM `tifas_kunena_categories` WHERE `id` = '528'122μs4.66KB/libraries/kunena/src/Tables/TableKunenaCategories.php:295Copy
  • SHOW FULL COLUMNS FROM `tifas_kunena_topics`332μs1.7KB/libraries/vendor/joomla/database/src/Mysqli/MysqliDriver.php:625Copy
  • SELECT * FROM `tifas_kunena_topics` WHERE `id` = '92811'150μs13.81KB/libraries/kunena/src/Tables/TableKunenaTopics.php:223Copy
  • SHOW FULL COLUMNS FROM `tifas_kunena_messages`319μs1.58KB/libraries/vendor/joomla/database/src/Mysqli/MysqliDriver.php:625Copy
  • SELECT m.*,t.message FROM `tifas_kunena_messages` AS `m` INNER JOIN `tifas_kunena_messages_text` AS `t` ON `m`.`id` = `t`.`mesid` WHERE `m`.`id` = 92811199μs2.53KB/libraries/kunena/src/Tables/TableKunenaMessages.php:216Copy
  • SELECT COUNT(*) FROM `tifas_kunena_messages` AS `a` WHERE `thread` = '92811' AND `a`.`hold` IN (0)215μs536B/libraries/kunena/src/Database/Object/KunenaFinder.php:278Copy
  • SELECT a.id FROM `tifas_kunena_messages` AS `a` WHERE `thread` = '92811' AND `a`.`hold` IN (0) ORDER BY a.`time` ASC LIMIT 6155μs552B/libraries/kunena/src/Database/Object/KunenaFinder.php:234Copy
  • SELECT m.*, t.message FROM `tifas_kunena_messages` AS `m` INNER JOIN `tifas_kunena_messages_text` AS `t` ON m.id = t.mesid WHERE `m`.`id` IN (92816)1.22ms2.53KB/libraries/kunena/src/Forum/Message/KunenaMessageHelper.php:120Copy
  • SELECT * FROM `tifas_kunena_thankyou` WHERE `postid` IN (92811,92816)106μs688B/libraries/kunena/src/Forum/Message/Thankyou/KunenaMessageThankyouHelper.php:116Copy
  • SELECT u.name, u.username, u.email, u.block AS blocked, u.registerDate, u.lastvisitDate, ku.*, u.id AS userid FROM `tifas_users` AS `u` LEFT JOIN `tifas_kunena_users` AS `ku` ON `u`.`id` = `ku`.`userid` WHERE `u`.`id` IN (1903,82)213μs25KB/libraries/kunena/src/User/KunenaUserHelper.php:247Copy
  • SELECT * FROM `tifas_kunena_attachments` WHERE `mesid` IN (92811,92816)104μs1.45KB/libraries/kunena/src/Attachment/KunenaAttachmentHelper.php:234Copy
  • SELECT * FROM `tifas_kunena_user_topics` WHERE (`user_id` = '0') AND (`topic_id` IN (92811))125μs1.27KB/libraries/kunena/src/Forum/Topic/User/KunenaTopicUserHelper.php:159Copy
  • SHOW FULL COLUMNS FROM `tifas_kunena_user_topics`306μs1.42KB/libraries/vendor/joomla/database/src/Mysqli/MysqliDriver.php:625Copy
  • SELECT u.name, u.username, u.email, u.block as blocked, u.registerDate, u.lastvisitDate, ku.* FROM `tifas_users` AS `u` LEFT JOIN `tifas_kunena_users` AS `ku` ON `u`.`id` = `ku`.`userid` WHERE `u`.`id` = '1903'180μs24.95KB/libraries/kunena/src/Tables/KunenaUsers.php:575Copy
  • SELECT `code`,`location` FROM `tifas_kunena_smileys`74μs960B/libraries/kunena/src/BBCode/KunenaBBCode.php:1122Copy
  • UPDATE `tifas_kunena_topics` SET `hits` = (`hits` + 1) WHERE `id` = '92811'421μs48B/libraries/src/Table/Table.php:1325Copy
  • SELECT `m`.`id`,`m`.`title`,`m`.`module`,`m`.`position`,`m`.`content`,`m`.`showtitle`,`m`.`params`,`mm`.`menuid` FROM `tifas_modules` AS `m` LEFT JOIN `tifas_modules_menu` AS `mm` ON `mm`.`moduleid` = `m`.`id` LEFT JOIN `tifas_extensions` AS `e` ON `e`.`element` = `m`.`module` AND `e`.`client_id` = `m`.`client_id` WHERE ( ( (`m`.`published` = 1 AND `e`.`enabled` = 1 AND `m`.`client_id` = :clientId AND `m`.`access` IN (:preparedArray1)) AND (`m`.`publish_up` IS NULL OR `m`.`publish_up` <= :publishUp)) AND (`m`.`publish_down` IS NULL OR `m`.`publish_down` >= :publishDown)) AND (`mm`.`menuid` = :itemId OR `mm`.`menuid` <= 0) ORDER BY `m`.`position`,`m`.`ordering`619μs1.86KBParams/libraries/src/Cache/Controller/CallbackController.php:51Copy
  • SHOW FULL COLUMNS FROM `tifas_kunena_polls`338μs1.33KB/libraries/vendor/joomla/database/src/Mysqli/MysqliDriver.php:625Copy
  • SELECT * FROM `tifas_kunena_ranks`110μs1.48KB/libraries/kunena/src/User/KunenaUser.php:1629Copy
  • SELECT * FROM `tifas_kunena_attachments` WHERE `mesid` IN (92811)108μs1.45KB/libraries/kunena/src/Attachment/KunenaAttachmentHelper.php:234Copy
  • SELECT * FROM `tifas_kunena_attachments` WHERE `mesid` IN (92811)86μs1.45KB/libraries/kunena/src/Attachment/KunenaAttachmentHelper.php:234Copy
  • SELECT userid, MAX(time) AS time FROM `tifas_session` WHERE `client_id` = 0 AND `userid` > 0 AND `time` > '1744165539' GROUP BY `userid` ORDER BY `time` DESC170μs576B/libraries/kunena/src/User/KunenaUserHelper.php:544Copy
  • SELECT * FROM `tifas_kunena_attachments` WHERE `mesid` IN (92816)98μs1.45KB/libraries/kunena/src/Attachment/KunenaAttachmentHelper.php:234Copy
  • SELECT * FROM `tifas_kunena_attachments` WHERE `mesid` IN (92816)84μs1.45KB/libraries/kunena/src/Attachment/KunenaAttachmentHelper.php:234Copy
  • SELECT DISTINCT a.id, a.title, a.name, a.checked_out, a.checked_out_time, a.note, a.state, a.access, a.created_time, a.created_user_id, a.ordering, a.language, a.fieldparams, a.params, a.type, a.default_value, a.context, a.group_id, a.label, a.description, a.required, a.only_use_in_subform,l.title AS language_title, l.image AS language_image,uc.name AS editor,ag.title AS access_level,ua.name AS author_name,g.title AS group_title, g.access as group_access, g.state AS group_state, g.note as group_note FROM tifas_fields AS a LEFT JOIN `tifas_languages` AS l ON l.lang_code = a.language LEFT JOIN tifas_users AS uc ON uc.id=a.checked_out LEFT JOIN tifas_viewlevels AS ag ON ag.id = a.access LEFT JOIN tifas_users AS ua ON ua.id = a.created_user_id LEFT JOIN tifas_fields_groups AS g ON g.id = a.group_id WHERE ( (`a`.`context` = :context AND `a`.`access` IN (:preparedArray1)) AND (`a`.`group_id` = 0 OR `g`.`access` IN (:preparedArray2)) AND `a`.`state` = :state) AND (`a`.`group_id` = 0 OR `g`.`state` = :gstate) AND `a`.`only_use_in_subform` = :only_use_in_subform ORDER BY a.ordering ASC517μs4.03KBParams/libraries/src/MVC/Model/BaseDatabaseModel.php:166Copy
  • SELECT * FROM `tifas_kunena_announcement` WHERE `published` = 1 AND (`publish_up` = '1000-01-01 00:00:00' OR `publish_up` <= '2025-04-09 02:55:39') AND (`publish_down` ='1000-01-01 00:00:00' OR `publish_down` >= '2025-04-09 02:55:39') ORDER BY `id` DESC LIMIT 1109μs1.42KB/libraries/kunena/src/Forum/Announcement/KunenaAnnouncementHelper.php:145Copy
  • SHOW FULL COLUMNS FROM `tifas_jev_users`359μs1.58KB/libraries/vendor/joomla/database/src/Mysqli/MysqliDriver.php:625Copy
  • SELECT `c`.`id`,`c`.`asset_id`,`c`.`access`,`c`.`alias`,`c`.`checked_out`,`c`.`checked_out_time`,`c`.`created_time`,`c`.`created_user_id`,`c`.`description`,`c`.`extension`,`c`.`hits`,`c`.`language`,`c`.`level`,`c`.`lft`,`c`.`metadata`,`c`.`metadesc`,`c`.`metakey`,`c`.`modified_time`,`c`.`note`,`c`.`params`,`c`.`parent_id`,`c`.`path`,`c`.`published`,`c`.`rgt`,`c`.`title`,`c`.`modified_user_id`,`c`.`version`, CASE WHEN CHAR_LENGTH(`c`.`alias`) != 0 THEN CONCAT_WS(':', `c`.`id`, `c`.`alias`) ELSE `c`.`id` END as `slug` FROM `tifas_categories` AS `c` WHERE (`c`.`extension` = :extension OR `c`.`extension` = 'system') AND `c`.`access` IN (:preparedArray1) AND `c`.`published` = 1 ORDER BY `c`.`lft`263μs3.91KBParams/libraries/src/Categories/Categories.php:375Copy
  • SELECT c.id FROM tifas_categories AS c WHERE c.access IN (1) AND c.published = 1 AND c.language in ('en-GB','*') AND c.extension = 'com_jevents' ORDER BY c.lft asc163μs584B/components/com_jevents/libraries/dbmodel.php:547Copy
  • SELECT c.id FROM tifas_categories AS c WHERE c.access IN (1) AND c.published = 1 AND c.language in ('en-GB','*') AND c.extension = 'com_jevents' AND ((c.lft>=87 AND c.rgt<=88 )) ORDER BY c.lft asc161μs536B/components/com_jevents/libraries/dbmodel.php:547Copy
  • SELECT ev.ev_id FROM tifas_jevents_repetition as rpt INNER JOIN tifas_jevents_vevent as ev ON rpt.eventid = ev.ev_id INNER JOIN tifas_jevents_icsfile as icsf ON icsf.ics_id=ev.icsid INNER JOIN tifas_jevents_vevdetail as det ON det.evdet_id = rpt.eventdetail_id LEFT JOIN tifas_jevents_rrule as rr ON rr.eventid = rpt.eventid WHERE ev.catid IN(-1,68) AND ev.created >= '2024-10-11 00:00:00' AND ev.created <= '2025-10-06 23:59:59' AND ev.state=1 AND ev.access IN (1) AND icsf.state=1 AND icsf.access IN (1) GROUP BY ev.ev_id ORDER BY ev.created DESC LIMIT 10773μs520B/components/com_jevents/libraries/dbmodel.php:271Copy
  • SELECT rpt.*, ev.*, rr.*, det.*, ev.state as published, ev.created as created , YEAR(rpt.startrepeat) as yup, MONTH(rpt.startrepeat ) as mup, DAYOFMONTH(rpt.startrepeat ) as dup , YEAR(rpt.endrepeat ) as ydn, MONTH(rpt.endrepeat ) as mdn, DAYOFMONTH(rpt.endrepeat ) as ddn , HOUR(rpt.startrepeat) as hup, MINUTE(rpt.startrepeat ) as minup, SECOND(rpt.startrepeat ) as sup , HOUR(rpt.endrepeat ) as hdn, MINUTE(rpt.endrepeat ) as mindn, SECOND(rpt.endrepeat ) as sdn FROM tifas_jevents_repetition as rpt INNER JOIN tifas_jevents_vevent as ev ON rpt.eventid = ev.ev_id INNER JOIN tifas_jevents_icsfile as icsf ON icsf.ics_id=ev.icsid INNER JOIN tifas_jevents_vevdetail as det ON det.evdet_id = rpt.eventdetail_id LEFT JOIN tifas_jevents_rrule as rr ON rr.eventid = rpt.eventid WHERE ev.catid IN(-1,68) AND ev.created >= '2024-10-11 00:00:00' AND ev.created <= '2025-10-06 23:59:59' AND ev.state=1 AND ev.access IN (1) AND icsf.state=1 AND icsf.access IN (1) AND ev.ev_id IN (0) ORDER BY ev.created DESC , rpt.startrepeat ASC267μs10.33KB/components/com_jevents/libraries/dbmodel.php:3274Copy
  • SELECT `name`,`element` FROM `tifas_extensions` WHERE `type` = 'plugin' AND `folder` = 'finder' AND `enabled` = 1248μs736B/administrator/components/com_finder/src/Helper/LanguageHelper.php:134Copy
  • SELECT `title` FROM `tifas_finder_taxonomy` WHERE `parent_id` = 1 AND `state` = 1 AND `access` IN (1)121μs584B/administrator/components/com_finder/src/Indexer/Taxonomy.php:314Copy
  • SELECT * FROM `tifas_banners` WHERE (`reset` <= :date AND `reset` IS NOT NULL) AND (`checked_out` IS NULL OR `checked_out` = :userId)178μs5.39KBParams/administrator/components/com_banners/src/Helper/BannersHelper.php:69Copy
  • SELECT `a`.`id`,`a`.`type`,`a`.`name`,`a`.`clickurl`,`a`.`sticky`,`a`.`cid`,`a`.`description`,`a`.`params`,`a`.`custombannercode`,`a`.`track_impressions`,`cl`.`track_impressions` AS `client_track_impressions` FROM `tifas_banners` AS `a` LEFT JOIN `tifas_banner_clients` AS `cl` ON `cl`.`id` = `a`.`cid` WHERE ( ( (`a`.`state` = 1) AND (`a`.`publish_up` IS NULL OR `a`.`publish_up` <= :nowDate1)) AND (`a`.`publish_down` IS NULL OR `a`.`publish_down` >= :nowDate2)) AND (`a`.`imptotal` = 0 OR `a`.`impmade` < `a`.`imptotal`) AND `a`.`catid` IN (:preparedArray1) ORDER BY `a`.`sticky` DESC, RAND() LIMIT 1444μs2.28KBParams/libraries/src/MVC/Model/BaseDatabaseModel.php:166Copy
  • UPDATE `tifas_banners` SET `impmade` = `impmade` + 1 WHERE `id` IN (:preparedArray1)401μs856BParams/components/com_banners/src/Model/BannersModel.php:315Copy
  • UPDATE `tifas_banner_tracks` SET `count` = `count` + 1 WHERE `track_type` = 1 AND `banner_id` = :id AND `track_date` = :trackDate374μs832BParams/components/com_banners/src/Model/BannersModel.php:352Copy
  • SELECT `a`.`id`,`a`.`asset_id`,`a`.`title`,`a`.`type`,`a`.`execution_rules`,`a`.`state`,`a`.`last_exit_code`,`a`.`locked`,`a`.`last_execution`,`a`.`next_execution`,`a`.`times_executed`,`a`.`times_failed`,`a`.`priority`,`a`.`ordering`,`a`.`note`,`a`.`checked_out`,`a`.`checked_out_time`,`uc`.`name` AS `editor` FROM `tifas_scheduler_tasks` AS `a` LEFT JOIN `tifas_users` AS `uc` ON `uc`.`id` = `a`.`checked_out` WHERE `a`.`state` = :state AND `a`.`next_execution` <= :now ORDER BY `a`.`title` asc192μs3.16KBParams/administrator/components/com_scheduler/src/Model/TasksModel.php:391Copy
  • SELECT `a`.`id`,`a`.`asset_id`,`a`.`title`,`a`.`type`,`a`.`execution_rules`,`a`.`state`,`a`.`last_exit_code`,`a`.`locked`,`a`.`last_execution`,`a`.`next_execution`,`a`.`times_executed`,`a`.`times_failed`,`a`.`priority`,`a`.`ordering`,`a`.`note`,`a`.`checked_out`,`a`.`checked_out_time`,`uc`.`name` AS `editor` FROM `tifas_scheduler_tasks` AS `a` LEFT JOIN `tifas_users` AS `uc` ON `uc`.`id` = `a`.`checked_out` WHERE `a`.`state` = :state AND `a`.`locked` IS NOT NULL ORDER BY `a`.`title` asc149μs3.18KBParams/administrator/components/com_scheduler/src/Model/TasksModel.php:391Copy
  • SHOW TABLES679μs8.51KB/libraries/vendor/joomla/database/src/Mysqli/MysqliDriver.php:678Copy