Hi,

I have read somewhere that the focus calibration or "backfocus" problem is due to the camera's auto focus and not the lens'. How can I test my camera if I have this problem?

Thanks for any input.


- Doy

I have found this site to be very helpful. I recommend everyone to use this whenever purchasing 2nd hand lenses and purchasing third party lenses...

http://www.photo.net/learn/focustest/

Thanks John. I will try manually focusing, then auto focusing to check if I have a focus calibration error. Will post my results.


- Doy

Thanks John. I will try manually focusing, then auto focusing to check if I have a focus calibration error. Will post my results.


- Doy

Hi Doy,

I once had a problem with the alignment of the af of my 70-200. Took it to the shop (Canon) they did some tests and they were able to realign it. I suggest you take it to the shop to have it professionally checked on. It only took 1 minute for the test. Better then running some do it yourself test since the accuracy is much higher.

Hope this helps.:)

Thanks, Pilar. I looked around but I don't have an authorized service center here in Olando. Will do the test here just for my comfort level.

Thanks to all replies.

Hi,

I have read somewhere that the focus calibration or "backfocus" problem is due to the camera's auto focus and not the lens'. How can I test my camera if I have this problem?

Thanks for any input.


- Doy
DOY, yes you're right. we may find some tips here

http://www.digitalphotographer.com.ph/forum/showthread.php?t=3786&page=4&highlight=backfocus


to test your camera ... you may do this too.

HOW TO TEST SENSOR WIDTH
A good way to test your camera's sensor location is to use Digital Darrell's patent-pending Featureless Blank Wall Method. Here is a summary and detail of the process:

Summary

* Autofocus on a blank wall, and let it rack in and out once.
* Keep the shutter button down half way so that the AF system keeps seeking a subject.
* Slowly move the camera toward a window frame until the sensor detects it and focuses.
* Look to see exactly where that happened in the viewfinder.
* Repeat for all the sensors.


for the details, we may find them by visiting http://www.nikonians.org (http://www.nikonians.org/) tips-n-tricks.