Check Canon EOS 400D Digital with EF 50mm f/1.4 USM back focus issue

16 Aug

Posted by Jayce as Photography - 213 views

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 http://focusTestChart.com. It is very useful.

Here are the result I got.

Little bit back focus?

Back focus

There result is not consistent. Sometime it is fine but some time it is not. It will have back focus issue in when focus more 5m sometime. This is one of the problem I hate. Another one is focus hunting issue. Will try to find out why it has focus hunting soon.
Related topics:
My Canon EOS 400D Digital and EF 50mm f/1.4 USM are backed!
Focus lock issue with Canon EOS 400D Digital

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7 Responses

Cavin

August 17th, 2007 at 12:28 pm
1

50mm cant get a focus lock if shooting too close to object.

try patch in a close-up filter +4 and focus again.
Jayce

August 17th, 2007 at 2:12 pm
2

It need more than 45cm to lock on focus as the minimum focus range is 45cm for this 50mm. All the shots were took more than 45cm. Yet it still fail to focus sometime. And sometime lock on but back focus. I wonder why…
soohonk

August 25th, 2007 at 2:12 pm
3

IMO, probably is the 50mm F1.4 lens, which is known having backfocus issue….. I am using 400D have not really encounter backfocus problem, do not have 50mm lens. click from Fredmiranda, probably u have read about the backissue problem too over the review there..
Jayce

August 25th, 2007 at 4:08 pm
4

I agreed that 50mm f1.4 is known having back focus issue due to very narrow DOF. Just a slightly focus lose in f1.4, your photo will be out of focus.
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