so , just to be absolutely sure i understand this, the 400d comes with a standard kit lens thats has 18-55mm written on the side. This means that attaching this lens onto the 400d, with a FLM of 1.6 the lens becomes a 2.8 - 88mm lens. Is this correct?
How does this affect the apature size? I would imagine that a 35mm lens at 2.8f, would be a much larger apature than a digital camera lens at 2.8, as the digital camera has a smaller sensor. is there a formula here to work out the f value?
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Sigma 70-300mm APO DG (Macro) F4-5.6.
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Not quite correct. The 300D and 400D have the same C size sensor. The only difference is the number of pixels on the sensor - which has no effect on the image size - only the quality.
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so , just to be absolutely sure i understand this, the 400d comes with a standard kit lens thats has 18-55mm written on the side. This means that attaching this lens onto the 400d, with a FLM of 1.6 the lens becomes a 2.8 - 88mm lens. Is this correct?
How does this affect the apature size? I would imagine that a 35mm lens at 2.8f, would be a much larger apature than a digital camera lens at 2.8, as the digital camera has a smaller sensor. is there a formula here to work out the f value?
No - an 18-55mm lens becomes the equivalent of a 28.8 - 88mm, this then gives you the zoom effect. Aperature is a different story altogether. The C sensor in the 400D has no effect at all on Aperature.
Aperature (in F numbers) is a function of the size of the opening e.g. 58mm for a typical SLR lens and the focal length of the lens plus a couple of other bits and bobs that I haven't yet researched. Generally speaking the longer the focal length of the lens the bigger the F number will become (same as scopes). In order to get a F2.8 on a 500mm lens the bigger the business end will become, hence the price will increase dramatically.
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Sigma 70-300mm APO DG (Macro) F4-5.6.
Yep I have one of these too and highly recommend it as being great value for money. Great for regular photography too.
You just can't beat this for the price.
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GROUP BY `m`.`id`,`mm`.`hold`232μs832B/libraries/kunena/src/Forum/Message/KunenaMessageHelper.php:539CopySELECT *
FROM `tifas_kunena_attachments`
WHERE `mesid` IN (62147)95μs1.45KB/libraries/kunena/src/Attachment/KunenaAttachmentHelper.php:234CopySELECT *
FROM `tifas_kunena_attachments`
WHERE `mesid` IN (62147)85μs1.45KB/libraries/kunena/src/Attachment/KunenaAttachmentHelper.php:234CopySELECT m.id, mm.hold, m.catid AS category_id, m.thread AS topic_id,
SUM(mm.time<m.time) AS before_count,
SUM(mm.time>m.time) AS after_count
FROM `tifas_kunena_messages` AS `m`
INNER JOIN `tifas_kunena_messages` AS `mm` ON `m`.`thread` = `mm`.`thread`
WHERE `m`.`id` IN (62147)
GROUP BY `m`.`id`,`mm`.`hold`221μs832B/libraries/kunena/src/Forum/Message/KunenaMessageHelper.php:539CopySELECT *
FROM `tifas_kunena_attachments`
WHERE `mesid` IN (62148)106μs1.45KB/libraries/kunena/src/Attachment/KunenaAttachmentHelper.php:234CopySELECT *
FROM `tifas_kunena_attachments`
WHERE `mesid` IN (62148)89μs1.45KB/libraries/kunena/src/Attachment/KunenaAttachmentHelper.php:234CopySELECT m.id, mm.hold, m.catid AS category_id, m.thread AS topic_id,
SUM(mm.time<m.time) AS before_count,
SUM(mm.time>m.time) AS after_count
FROM `tifas_kunena_messages` AS `m`
INNER JOIN `tifas_kunena_messages` AS `mm` ON `m`.`thread` = `mm`.`thread`
WHERE `m`.`id` IN (62148)
GROUP BY `m`.`id`,`mm`.`hold`208μs832B/libraries/kunena/src/Forum/Message/KunenaMessageHelper.php:539CopySELECT *
FROM `tifas_kunena_attachments`
WHERE `mesid` IN (62149)108μs1.45KB/libraries/kunena/src/Attachment/KunenaAttachmentHelper.php:234CopySELECT *
FROM `tifas_kunena_attachments`
WHERE `mesid` IN (62149)113μs1.45KB/libraries/kunena/src/Attachment/KunenaAttachmentHelper.php:234CopySELECT m.id, mm.hold, m.catid AS category_id, m.thread AS topic_id,
SUM(mm.time<m.time) AS before_count,
SUM(mm.time>m.time) AS after_count
FROM `tifas_kunena_messages` AS `m`
INNER JOIN `tifas_kunena_messages` AS `mm` ON `m`.`thread` = `mm`.`thread`
WHERE `m`.`id` IN (62149)
GROUP BY `m`.`id`,`mm`.`hold`192μs832B/libraries/kunena/src/Forum/Message/KunenaMessageHelper.php:539CopySELECT *
FROM `tifas_kunena_attachments`
WHERE `mesid` IN (62150)99μs1.45KB/libraries/kunena/src/Attachment/KunenaAttachmentHelper.php:234CopySELECT *
FROM `tifas_kunena_attachments`
WHERE `mesid` IN (62150)97μs1.45KB/libraries/kunena/src/Attachment/KunenaAttachmentHelper.php:234CopySELECT m.id, mm.hold, m.catid AS category_id, m.thread AS topic_id,
SUM(mm.time<m.time) AS before_count,
SUM(mm.time>m.time) AS after_count
FROM `tifas_kunena_messages` AS `m`
INNER JOIN `tifas_kunena_messages` AS `mm` ON `m`.`thread` = `mm`.`thread`
WHERE `m`.`id` IN (62150)
GROUP BY `m`.`id`,`mm`.`hold`202μs832B/libraries/kunena/src/Forum/Message/KunenaMessageHelper.php:539CopySELECT *
FROM `tifas_kunena_attachments`
WHERE `mesid` IN (62152)100μs1.45KB/libraries/kunena/src/Attachment/KunenaAttachmentHelper.php:234CopySELECT *
FROM `tifas_kunena_attachments`
WHERE `mesid` IN (62152)82μs1.45KB/libraries/kunena/src/Attachment/KunenaAttachmentHelper.php:234CopySELECT m.id, mm.hold, m.catid AS category_id, m.thread AS topic_id,
SUM(mm.time<m.time) AS before_count,
SUM(mm.time>m.time) AS after_count
FROM `tifas_kunena_messages` AS `m`
INNER JOIN `tifas_kunena_messages` AS `mm` ON `m`.`thread` = `mm`.`thread`
WHERE `m`.`id` IN (62152)
GROUP BY `m`.`id`,`mm`.`hold`216μs832B/libraries/kunena/src/Forum/Message/KunenaMessageHelper.php:539CopySELECT 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 ASC632μs4.03KBParams/libraries/src/MVC/Model/BaseDatabaseModel.php:166CopySELECT *
FROM `tifas_kunena_announcement`
WHERE `published` = 1 AND (`publish_up` = '1000-01-01 00:00:00' OR `publish_up` <= '2025-04-07 22:58:45') AND (`publish_down` ='1000-01-01 00:00:00' OR `publish_down` >= '2025-04-07 22:58:45')
ORDER BY `id` DESC LIMIT 1116μs1.42KB/libraries/kunena/src/Forum/Announcement/KunenaAnnouncementHelper.php:145CopySHOW FULL COLUMNS FROM `tifas_jev_users`423μs1.58KB/libraries/vendor/joomla/database/src/Mysqli/MysqliDriver.php:625CopySELECT `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`293μs3.91KBParams/libraries/src/Categories/Categories.php:375CopySELECT 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 asc171μs584B/components/com_jevents/libraries/dbmodel.php:547CopySELECT 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 asc163μs536B/components/com_jevents/libraries/dbmodel.php:547CopySELECT 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 >= '2024-10-09 00:00:00' AND ev.created <= '2025-10-04 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 10811μs520B/components/com_jevents/libraries/dbmodel.php:271CopySELECT 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 >= '2024-10-09 00:00:00' AND ev.created <= '2025-10-04 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 ASC301μs10.33KB/components/com_jevents/libraries/dbmodel.php:3274CopySELECT `name`,`element`
FROM `tifas_extensions`
WHERE `type` = 'plugin' AND `folder` = 'finder' AND `enabled` = 1487μs736B/administrator/components/com_finder/src/Helper/LanguageHelper.php:134CopySELECT `title`
FROM `tifas_finder_taxonomy`
WHERE `parent_id` = 1 AND `state` = 1 AND `access` IN (1)130μs584B/administrator/components/com_finder/src/Indexer/Taxonomy.php:314CopySELECT *
FROM `tifas_banners`
WHERE
(`reset` <= :date AND `reset` IS NOT NULL) AND
(`checked_out` IS NULL OR `checked_out` = :userId)197μs5.39KBParams/administrator/components/com_banners/src/Helper/BannersHelper.php:69CopySELECT `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 1411μs2.28KBParams/libraries/src/MVC/Model/BaseDatabaseModel.php:166CopyUPDATE `tifas_banners`
SET `impmade` = `impmade` + 1
WHERE `id` IN (:preparedArray1)482μs856BParams/components/com_banners/src/Model/BannersModel.php:315CopyUPDATE `tifas_banner_tracks`
SET `count` = `count` + 1
WHERE `track_type` = 1 AND `banner_id` = :id AND `track_date` = :trackDate605μs832BParams/components/com_banners/src/Model/BannersModel.php:352CopySELECT `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` asc182μs3.16KBParams/administrator/components/com_scheduler/src/Model/TasksModel.php:391CopySELECT `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` asc171μs3.18KBParams/administrator/components/com_scheduler/src/Model/TasksModel.php:391CopySHOW TABLES703μs8.51KB/libraries/vendor/joomla/database/src/Mysqli/MysqliDriver.php:678Copy