EX1R focus problem at DVinfo.net

Koravik Rakpetchmanee · October 9th, 2011, 01:35 PM

Hi,

I just noticed that my ex1r changed focus when zoom in and out.

For example when i set the camera to focus object at z30 and then i zoom in at z50, the object now is out of focus.

I noticed this issue when i used it with letus ultimate when i zoomed all the way to the ground glass and then zoomed out a bit, the ground glass was not in the focus anymore.

Full manual focus was on.

Is this normal?

Is it relate to back focus?

Thank you

Olof Ekbergh · October 9th, 2011, 06:20 PM

Yes do the back focus, it is an automatic procedure.

Here is a thread about how to do it on an EX1R.

http://www.dvinfo.net/forum/sony-xdc...ml#post1524295

Koravik Rakpetchmanee · October 9th, 2011, 09:44 PM

Thank you

I did the back focus setting but it's still the same.

However i think i set it not properly.

I will do it again.

Alister Chapman · October 10th, 2011, 10:09 AM

I tend to do back focus using a patterned wall covering or textured wall (brickwork?) rather than using a siemens chart. I also use place the camera at least 3m (9ft), more often closer to 4m, from the target wall. I've watched the camera focussing on the siemens star chart and I don't think it always nails it all that accurately.

Koravik Rakpetchmanee · October 13th, 2011, 12:08 AM

Alister thank you for the technic.

Juan McFarland · October 14th, 2011, 03:54 AM

I concur with Alister, charts haven't always worked for me either when using the automated backfocus operation.

These cameras sometimes lose backfocus at the worst time, so make sure you know the backfocus procedure.

October 9th, 2011, 01:35 PM	#1
Koravik Rakpetchmanee Regular Crew Join Date: Jan 2011 Location: Melbourne Posts: 37	EX1R focus problem Hi, I just noticed that my ex1r changed focus when zoom in and out. For example when i set the camera to focus object at z30 and then i zoom in at z50, the object now is out of focus. I noticed this issue when i used it with letus ultimate when i zoomed all the way to the ground glass and then zoomed out a bit, the ground glass was not in the focus anymore. Full manual focus was on. Is this normal? Is it relate to back focus? Thank you

October 9th, 2011, 06:20 PM	#2
Olof Ekbergh Sponsor: Westside AV Join Date: Dec 2008 Location: Mount Washington Valley, NH, USA Posts: 1,365	Re: EX1R focus problem Yes do the back focus, it is an automatic procedure. Here is a thread about how to do it on an EX1R. http://www.dvinfo.net/forum/sony-xdc...ml#post1524295 __________________ Olof Ekbergh • olof@WestsideAV.com Westside A V Studios • http://www.WestsideAVstore.com/

October 9th, 2011, 09:44 PM	#3
Koravik Rakpetchmanee Regular Crew Join Date: Jan 2011 Location: Melbourne Posts: 37	Re: EX1R focus problem Thank you I did the back focus setting but it's still the same. However i think i set it not properly. I will do it again.

October 10th, 2011, 10:09 AM	#4
Alister Chapman Inner Circle Join Date: Dec 2005 Location: Bracknell, Berkshire, UK Posts: 4,957	Re: EX1R focus problem I tend to do back focus using a patterned wall covering or textured wall (brickwork?) rather than using a siemens chart. I also use place the camera at least 3m (9ft), more often closer to 4m, from the target wall. I've watched the camera focussing on the siemens star chart and I don't think it always nails it all that accurately. __________________ Alister Chapman, Film-Maker/Stormchaser http://www.xdcam-user.com/alisters-blog/ My XDCAM site and blog. http://www.hurricane-rig.com

October 13th, 2011, 12:08 AM	#5
Koravik Rakpetchmanee Regular Crew Join Date: Jan 2011 Location: Melbourne Posts: 37	Re: EX1R focus problem Alister thank you for the technic.

October 14th, 2011, 03:54 AM	#6
Juan McFarland Regular Crew Join Date: Apr 2008 Location: Honolulu HI Posts: 50	Re: EX1R focus problem I concur with Alister, charts haven't always worked for me either when using the automated backfocus operation. These cameras sometimes lose backfocus at the worst time, so make sure you know the backfocus procedure.