| |  | |  | Trouble setting ISO on Canon 40D |  | 
05-09-2008, 01:14 AM
| | Basic Member | | Join Date: Jul 2007 Location: Georgia
Posts: 8
Referrals: 1
| | | Trouble setting ISO on Canon 40D I can not get my 40D to change ISO to 100 OR to the H position (3200). I've read the book, tried and retried. I owned a 20D before this camera and it worked the same way. I thought I had been able to set ISO at 100 and at 3200 some time back on this 40D, but maybe not.
In trying to set 100 ISO, I make sure I'm in "Creative Mode", mash the ISO button and turn the dial, but when it gets down to 200, the next thing that appears is "auto"!
Same thing on the upper end.....I go into Custom Functions and turn the expanded ISO feature on, but when changing the ISO, it won't go above 1600!
Any ideas? Anyone else having this problem?
Thanks for any help! |  | Re: Trouble setting ISO on Canon 40D |  | 
05-09-2008, 09:15 AM
| | Lifetime Member | | Join Date: Mar 2002 Location: Ontario, Canada
Posts: 897
Referrals: 0
| | | Re: Trouble setting ISO on Canon 40D First, I'm pretty sure there is no 100 ISO. We made the switch to 200 and actually, I've been shooting a lot of 400 as standard with no loss of quality.
To get 3200, you have to turn off highlight tone priority. The setting is just under ISO expansion.
I use the 3 presets C1 - 3 to enable and disable the settings much faster. IOW, C1 will be 200 ISO, highlight priority, jpg, 5300K, etc, : C2 will be 3200 ISO, raw, 2500 ISO for a dark church interior. It switches with 1 click and retains your presets.
DougA |  | Re: Trouble setting ISO on Canon 40D |  | 
05-09-2008, 09:26 AM
|  | Lifetime Member | | Join Date: Oct 2003 Location: Weatherford, Texas
Posts: 2,012
Referrals: 0
| | | Re: Trouble setting ISO on Canon 40D Hi, Lamar, Quote:
Originally Posted by Lamar May
In trying to set 100 ISO, I make sure I'm in "Creative Mode", mash the ISO button and turn the dial, but when it gets down to 200, the next thing that appears is "auto"!
Same thing on the upper end.....I go into Custom Functions and turn the expanded ISO feature on, but when changing the ISO, it won't go above 1600! | As Doug Axford notes, you probably have Highlight Tone Priority in effect. Then, the range of ISO settings is limited to 200-1600. As a reminder of this, in the status panel and the viewfinder, the "0"s in the ISO display are replaced by the smaller "o" ( e. g., "16oo").
You can see this in the manual on p. 157 under C.Fn II-3, Highlight Tone priority.
__________________ Best regards,
Doug
Visit The Pumpkin, a library of my technical writings: http://doug.kerr.home.att.net/pumpkin
"Make everything as simple as possible, but no simpler." |  | Re: Trouble setting ISO on Canon 40D |  | 
05-09-2008, 09:31 AM
|  | Lifetime Member | | Join Date: Aug 2007 Location: Tampa, FL
Posts: 169
Referrals: 0
| | | Re: Trouble setting ISO on Canon 40D I just recently purchased a 40D and mine does have the 100 ISO. ISO 3200 will show as "H".
Ron
__________________ "I was really too honest a man to be a politician and live." Socrates. |  | Re: Trouble setting ISO on Canon 40D |  | 
05-09-2008, 11:31 AM
| | Basic Member | | Join Date: Jul 2007 Location: Georgia
Posts: 8
Referrals: 1
| | | Re: Trouble setting ISO on Canon 40D Thanks, guys....you're great! I THOUGHT I had used both 100 and 3200 before and the book clearly says they're there, but I didn't pick up on the highlights priority thing. Does anyone have an opinion on the highlight priority feature....I've had it turned on for a while, and have been pleased with the results I'm getting, but I have not done any tests to compare with and without that feature. Has anyone done that or read any test results?
Thanks again for the reminder!
LM |  | Re: Trouble setting ISO on Canon 40D |  | 
05-09-2008, 11:35 AM
| | Basic Member | | Join Date: Jul 2007 Location: Georgia
Posts: 8
Referrals: 1
| | | Re: Trouble setting ISO on Canon 40D Thanks, Doug....I have not used the custom settings, but that is a great idea....will try it.
LM |  | Re: Trouble setting ISO on Canon 40D |  | 
05-09-2008, 01:40 PM
|  | Lifetime Member | | Join Date: Feb 2001 Location: Florida, USA
Posts: 4,977
Referrals: 1
| | | Re: Trouble setting ISO on Canon 40D I think Doug is saying "under the covers the sensor doesn't really do ISO 100 and the camera is doing digital machinations to provide ISO 100", but I might be wrong. Doug, do you have a reference for this? I find ISO 100 still the most noise-free setting, but I really haven't experimented to find out if I'm losing dynamic range.
Lamar, do you shoot primarily raw or JPEG?
From what I gather Highlight Tone Priority really gains you nothing if you shoot raw.
Even if you shoot JPEGs, expose for the highlights and you can fix the images digitally later.
-Noel | | Thread Tools | Search this Thread | | | | | Display Modes | Linear Mode |
Posting Rules
| You may not post new threads You may not post replies You may not post attachments You may not edit your posts HTML code is On | | | | All times are GMT -4. The time now is 08:06 PM. | | | | |