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Difraction Grating + Hartmann Exposes Chromatic Distortion

  • mjc
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15 years 10 months ago #78481 by mjc
Difraction Grating + Hartmann Exposes Chromatic Distortion was created by mjc
I was tidying up my laptop after my second (unsuccessful) attempt at deep sky imaging (mist rolled in) and I stumbled across this experiment that I conducted in May last year.

This is am image of Vega - slightly out of focus - with a two hole (small aperture) Hartmann mask and a difraction grating mounted as a 1 1/4" filter.
Thus there are two images of the star and two spectra.

Without the Hartmann mask the spectrum looks fine but the blue end is clearly fish-tailed (I haven't presented an image of this case). With the Hartmann mask the spectra are tighter but curve in opposite directions revealing chromatic distortion at the red end which is not obvious without the Hartmann mask. The scope was my old Meade ETX 70.

I'm sharing this because I find it thought provoking and it might interest others.
1) It would appear that this could be used as a measure of chromatic distortion in optics (e.g., Graph the the distance between any two points - or just eyeball it).
2) Possibly (and only possibly) allow for calibration of chromatic distortion when doing spectroscopy with less than ideal optics.

If nothing else, an interesting phenomena.

Mark
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  • 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 (1582)194μs25KB/libraries/kunena/src/User/KunenaUserHelper.php:247Copy
  • SELECT * FROM `tifas_kunena_attachments` WHERE `mesid` IN (78481)99μs1.47KB/libraries/kunena/src/Attachment/KunenaAttachmentHelper.php:234Copy
  • SHOW FULL COLUMNS FROM `tifas_kunena_attachments`311μs1.45KB/libraries/vendor/joomla/database/src/Mysqli/MysqliDriver.php:625Copy
  • SELECT * FROM tifas_kunena_attachments WHERE `id` = '79'112μs1.47KB/libraries/kunena/src/Tables/KunenaTable.php:111Copy
  • SELECT * FROM `tifas_kunena_user_topics` WHERE (`user_id` = '0') AND (`topic_id` IN (78481))101μs1.27KB/libraries/kunena/src/Forum/Topic/User/KunenaTopicUserHelper.php:159Copy
  • SHOW FULL COLUMNS FROM `tifas_kunena_user_topics`295μs1.42KB/libraries/vendor/joomla/database/src/Mysqli/MysqliDriver.php:625Copy
  • SELECT `code`,`location` FROM `tifas_kunena_smileys`87μs960B/libraries/kunena/src/BBCode/KunenaBBCode.php:1122Copy
  • UPDATE `tifas_kunena_topics` SET `hits` = (`hits` + 1) WHERE `id` = '78481'373μs48B/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`755μs1.86KBParams/libraries/src/Cache/Controller/CallbackController.php:51Copy
  • SHOW FULL COLUMNS FROM `tifas_kunena_polls`292μs1.33KB/libraries/vendor/joomla/database/src/Mysqli/MysqliDriver.php:625Copy
  • SELECT * FROM `tifas_kunena_ranks`101μs1.48KB/libraries/kunena/src/User/KunenaUser.php:1629Copy
  • SELECT userid, MAX(time) AS time FROM `tifas_session` WHERE `client_id` = 0 AND `userid` > 0 AND `time` > '1744190065' GROUP BY `userid` ORDER BY `time` DESC155μs576B/libraries/kunena/src/User/KunenaUserHelper.php:544Copy
  • 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 ASC553μs4.03KBParams/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 09:44:25') AND (`publish_down` ='1000-01-01 00:00:00' OR `publish_down` >= '2025-04-09 09:44:25') ORDER BY `id` DESC LIMIT 1101μs1.42KB/libraries/kunena/src/Forum/Announcement/KunenaAnnouncementHelper.php:145Copy
  • SHOW FULL COLUMNS FROM `tifas_jev_users`392μs1.58KB/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`266μs3.91KBParams/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 asc169μs584B/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 asc167μs536B/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 10754μs520B/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 ASC303μs10.33KB/components/com_jevents/libraries/dbmodel.php:3274Copy
  • SELECT `name`,`element` FROM `tifas_extensions` WHERE `type` = 'plugin' AND `folder` = 'finder' AND `enabled` = 1251μs736B/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)123μs584B/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)173μs5.39KBParams/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 1393μs2.28KBParams/libraries/src/MVC/Model/BaseDatabaseModel.php:166Copy
  • UPDATE `tifas_banners` SET `impmade` = `impmade` + 1 WHERE `id` IN (:preparedArray1)377μs856BParams/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` = :trackDate329μs832BParams/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` asc218μs3.16KBParams/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` asc148μs3.18KBParams/administrator/components/com_scheduler/src/Model/TasksModel.php:391Copy
  • SHOW TABLES678μs8.51KB/libraries/vendor/joomla/database/src/Mysqli/MysqliDriver.php:678Copy