Re: [Canon-10D] Re: Lens no Focus

I tried a version of your test and they were not conclusive because the 
angle of me standing and looking down, at an angle, at a yardstick and a 
book ( for the AF) vertical at the 20" point. I should have angled the 
book backwards a slight bit so to have a flat surface facing the lens.

I took a photo using the auto focus first and 19" was in focus, not 20". 
I took another photo using manual focus and it was right on at 20".
The lens I used was the 100-400 at 400mm f.5.6.

The problem is that I am not quite sure where the point AF actually 
focus on. If it focused high up on the book, that would put it closer to 
me and 19" might be correct.

I have to do it again and pay attention to the details.

I'll get back to you guys.

Thanks a lot - really helpful.

Gary

On 4/4/2012 1:35 PM, lvthunder1 wrote:
> The best way to test it would be to do the following.  Get a piece of grid or 
> lined paper and tape it to a box.  Put it at about a 45 degree angle to your 
> camera on a tripod.  Either use lights or window light and focus on the 
> center line.  Then look at it on a computer and see where the focus is.  To 
> tell if it's the camera or the lens the easiest way is to use a 2nd body.  
> Borrow one from a friend if you need to.
>
> Stephen Cupp
>
> --- In [EMAIL PROTECTED], "gary.chris"<[EMAIL PROTECTED]>  wrote:
>> This is an interesting thread because I am wondering if my 5D body is
>> not focusing. Just doesn't seem like my shots are very sharp compared to
>> ones taken a couple of months ago.
>>
>> I have used 2 "L" glass lenses and both have similar, just noticeable,
>> 'lack-of-sharpness' in the shots. Could be my imagination, but I need to
>> find out before I send the body in for repair.
>>
>> Can the auto-focus on the camera body have a problem? And how do you
>> check it out?
>>
>> I am going to try to find a similar place I have taken photos before,
>> but none are around here, so it might be a while before I can use that
>> method.
>>
>> Gary
>>
>> On 4/3/2012 9:38 AM, Darrin J. Calcutt wrote:
>>> What are the chances that my 18-200 IS F3.5 - 5.6 lens is outs of wack?
>>>
>>> I'm just not happy with the amount of pictures I take that are out of focus.
>>>
>>> Most of the ime I shot with one point of focus, and re-compose.
>>>
>>> Darrin