After getting my Canon EOS 400D Digital back from service, I took a lot of shots with it. There is no back focus issue. However, I still face fail to focus lock issue as I mention at Check Canon EOS 400D Digital with EF 50mm f/1.4 USM back focus issue post.

I took lot of my sister baby photos lately. I faced lot of fail to focus lock issue. I did not use flash on baby. I used ISO 800 and above in low light room. But still failed to focus lock sometime. Is this a common issue with Canon EOS 400D Digital?

I am not satisfied. Therefore, I did some test on it. I took wall as sample. I cannot get a focus lock with built-in flash and without even with ISO 1600. Same applied to plain surface. However, I could get focus lock easily with my Canon Speedlite 580EX II even in very low light environment. Below is the shot I take with Canon Speedlite 580EX II. Is my Canon EOS 400D Digital having focus issue? Or just Canon Speedlite 580EX II is too powerful in focusing?

Shot with Canon Speedlite 580EX II

Related topics:
Check Canon EOS 400D Digital with EF 50mm f/1.4 USM back focus issue
My Canon EOS 400D Digital and EF 50mm f/1.4 USM are backed!
How to enable AF-assist beam but disable flash on Canon Speedlite 580EX II with Canon EOS 400D Digital?


I have focus problem with my Canon EOS 400D Digital. It does not perform well in low light even using a very fast lens like EF 50mm f/1.4. It have occasional focus hunting in low light environment issue. I am not sure why. It just cannot get a good focus lock. And sometime I did not get a good focus. The photo look like focusing the back of my main object. Therefore, I ran some test on its back focus issue. How to test back focus issue? I use the focus test chart from It is very useful.

Here are the result I got.

Little bit back focus?


This firmware update (Version 1.1.0) incorporates the following fixes and improvements.

  1. Adds support for the new Media Transfer Protocol (MTP) USB protocol.
  2. Corrects errors in the Simplified Chinese menu screens.

Grab the update at D REBEL XTi / 400D Firmware-E

Updated with Canon response…
Media Transfer Protocol (MTP) USB protocol allow the camera more versatility when connecting to different operating environments. It may be better for the camera to have extra modes like this one, than to not have them embedded in the Menu.


My Canon EOS 400D Digital comes along with Digital Photo Professional 2.2. I am happy that Canon release new version of Digital Photo Professional with lot of features. Hurry, head for Canon website to download it. Below are the changes…

Added functions
1. Support added for Windows Vista.
2. Support was added for EOS-1D Mark III.
3. Support added for single-image display for RAW+JPEG images. (*)
The edited content is applied only to RAW images. File moving, copying, or deleting applies to both the RAW image and the JPEG image. Single image display is only used with CR2-type RAW and JPEG images that were shot simultaneously. (The images used with TIFF-type RAW and JPEG images can not be displayed as a single image).
4. Enabled thumbnail image rearranging using drag & drop.
5. Enabled a frame display in trimmed images in main window or edit image window.
6. Added multi-image synchronizing function in edit window.
7. Supported multi-page printing in detailed setting printing.
8. Enabled a Color Management settings window call function in the detailed setting printing window.
9. Enabled images trimmed in DPP to print as trimmed images when they are printed using Easy-PhotoPrint, Easy-PhotoPrint Pro.
10. The GPS data can be displayed with other shooting information when the GPS data is added to it.