Does anyone have a link that explains how ISO and on camera hotshoe flashes work together? When I worked as a second shooter for my last wedding I was told to leave it on auto 400-800 ISO while in E-TTL but that was with a pentax k20d.
Nickc84 Goldmember  2,064 posts Likes: 80 Joined Jul 2010 More info | Mar 06, 2011 16:00 | #1 Does anyone have a link that explains how ISO and on camera hotshoe flashes work together? When I worked as a second shooter for my last wedding I was told to leave it on auto 400-800 ISO while in E-TTL but that was with a pentax k20d.
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Wilt Reader's Digest Condensed version of War and Peace [POTN Vol 1]  More info | Mar 06, 2011 16:06 | #2 Canon ETTL compatible flashes all can take the ISO information from the camera. You need to give me OK to edit your image and repost! Keep POTN alive and well with member support https://photography-on-the.net/forum/donate.php
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RandyMN Goldmember 3,131 posts Likes: 2 Joined Aug 2005 More info | Mar 06, 2011 16:11 | #3 I always just change ISO on camera which changes the flash unit. Never used auto ISO on the camera.
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gonzogolf dumb remark memorialized More info | Mar 06, 2011 16:14 | #4 I cant think of any benefit to using auto ISO when using a flash.
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Mar 06, 2011 16:16 | #5 Sorry, my question was worded wrong. I’m looking for some help understanding how ISO levels work while using a flash in E-TTL. Like.. how 800 ISO would differ from 1600 while shooting in low light during a wedding and with a 580 EXII.
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Wilt Reader's Digest Condensed version of War and Peace [POTN Vol 1] More info | Mar 06, 2011 16:18 | #6 Nickc84 wrote in post #11968249  Sorry, my question was worded wrong. I’m looking for some help understanding how ISO levels work while using a flash in E-TTL. Like.. how 800 ISO would differ from 1600 while shooting in low light during a wedding and with a 580 EXII. The flash would output 1/2 the amount of light because the ISO of the camera is 2x more sensitive to light You need to give me OK to edit your image and repost! Keep POTN alive and well with member support https://photography-on-the.net/forum/donate.php
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Mar 06, 2011 16:21 | #7 Wilt wrote in post #11968260 The flash would output 1/2 the amount of light because the ISO of the camera is 2x more sensitive to light Thanks
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bobbyz Cream of the Crop 20,506 posts Likes: 3479 Joined Nov 2007 Location: Bay Area, CA More info | Mar 06, 2011 16:27 | #8 Wilt wrote in post #11968260 The flash would output 1/2 the amount of light because the ISO of the camera is 2x more sensitive to light In addition you will get twice the ambient in your shot. Fuji XT-1, 18-55mm
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apersson850 Obviously it's a good thing  More info | That too, so it works like it always does. Anders
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pbelarge Goldmember  2,837 posts Joined Jun 2010 Location: Westchester County, NY More info | Here is a link to help you get started. just a few of my thoughts...
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Mar 06, 2011 17:52 | #11 pbelarge wrote in post #11968447 Here is a link to help you get started. http://photonotes.org/articles/eos-flash/ Thank you
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