Back Focus Problem at DVinfo.net

Tony Brennan · February 3rd, 2008, 07:50 PM

I have tested two EX1s from a Sony dealer and both seem to have a back focus problem in full manual. If you zoom in and focus on a subject about 20 feet away as you slowly zoom out the focus shifts to the background of the shot from about 25mm to 15mm and the subject you focused on is soft. This with everything set to manual. I tried the back focus function in the service menu but it had no effect. Has any one else got back focus problems?

Steven Thomas · February 3rd, 2008, 07:54 PM

No issues here..

Michael H. Stevens · February 3rd, 2008, 10:13 PM

I tried this test. As I zoom out the DOF increases so that the center of focus is indistiguishable. How do you do this test exactly.

Bill Heslip · February 3rd, 2008, 11:44 PM

Quote:

Originally Posted by Tony Brennan

I have tested two EX1s from a Sony dealer and both seem to have a back focus problem in full manual. If you zoom in and focus on a subject about 20 feet away as you slowly zoom out the focus shifts to the background of the shot from about 25mm to 15mm and the subject you focused on is soft. This with everything set to manual. I tried the back focus function in the service menu but it had no effect. Has any one else got back focus problems?

My focus issues were somewhat different but possibly related. Disregard the cadence mismatch Vimeo seemed to introduce and view at native scale.

http://www.vimeo.com/642741

A solution is in the works, and this anomaly appears to be quite rare.

February 3rd, 2008, 07:50 PM	#1
Tony Brennan New Boot Join Date: Jun 2007 Location: Melbourne Australia Posts: 15	Back Focus Problem I have tested two EX1s from a Sony dealer and both seem to have a back focus problem in full manual. If you zoom in and focus on a subject about 20 feet away as you slowly zoom out the focus shifts to the background of the shot from about 25mm to 15mm and the subject you focused on is soft. This with everything set to manual. I tried the back focus function in the service menu but it had no effect. Has any one else got back focus problems?

February 3rd, 2008, 07:54 PM	#2
Steven Thomas Trustee Join Date: Sep 2005 Location: Gilbert, AZ Posts: 1,896	No issues here..

February 3rd, 2008, 10:13 PM	#3
Michael H. Stevens Major Player Join Date: Sep 2007 Location: Palm Desert, California Posts: 311	I tried this test. As I zoom out the DOF increases so that the center of focus is indistiguishable. How do you do this test exactly.