16 x manual back focus adjustment at DVinfo.net

James Clarke · February 22nd, 2005, 01:07 PM

can anyone help me to reset the back focus on this lense it is not holding focus throughout the zoom range i need detailed instructions on how to reajust it

help

Richard Alvarez · February 22nd, 2005, 01:37 PM

Mount the camcorder on a tripod. Select an object 2-3m away from the lens, or an object about the same distancs away from the lens as the subject you want to shoot.

1) Use a subject with HIGH CONTRAST so it will be easy to tell when focus is achieved. (I reccomend using a black and white graphic on a large poster board, with fine lines in it)

2) Turn the IRIS/SELECT dial to open the aperture

3) Zoom all the way in to full telephoto

4) Turn the focusing ring and focus on the object

5) Zoom all the way out to full wide angle

6) Fully release the flange back fixing screw on the lens (counterclockwise)

7) Turn the flange ring until you obtain correct focus (The approximate position is where the flange back adjustment indicator is alligned with "F.B." marked on the lens)

8) Repeat steps 3 to 7 untill you obtain the correct focus on both ends.

9) Tighten the flange back fixing screw with the ring set in proper position. (Clockwise)

Chris Hurd · February 22nd, 2005, 01:40 PM

From the operator's manual:

Flange back adjustment of the lens

1) Mount the camcorder on a tripod. Select an object 2-3 m away from the lens, or an object about the same distance away from the lens as your subject. Use a subject with high contrast so it will be easy tell when focus is achieved.

2) Turn the IRIS/SELECT Dial to open the aperture.

3) Zoom all the way in to full telephoto.

4) Turn the focusing ring and focus on the object.

5) Zoom all the way out to full wide angle.

6) Fully release the flange back fixing screw on the lens (counterclockwise).

7) Turn the flange back ring until you obtain correct focus (H) The approximate position is where the flange back adjustment indicator is aligned with “F.B”.

8) Repeat steps 3) to 7) until you obtain the correct focus on both ends.

9) Tighten the flange back fixing screw with the ring set in proper position (clockwise).

Hope this helps,

Chris Hurd · February 22nd, 2005, 01:41 PM

Richard Alvarez -- geez! We were posting the same thing at the same time!

Richard Alvarez · February 22nd, 2005, 01:47 PM

Chris,

I assume my manual was only marginally closer to the keyboard than yours!

R

James Clarke · February 23rd, 2005, 11:44 AM

thanks guys ajustments are worked great its nice to know that this forum his here to adddress your every need

Richard Alvarez · February 23rd, 2005, 12:11 PM

No sweat James... but just for the record,

Not your EVERY need...

February 22nd, 2005, 01:07 PM	#1
James Clarke Regular Crew Join Date: Apr 2003 Location: BARBADOS Posts: 125 Images: 4	16 x manual lense can anyone help me to reset the back focus on this lense it is not holding focus throughout the zoom range i need detailed instructions on how to reajust it help

February 22nd, 2005, 01:40 PM	#3
Chris Hurd Obstreperous Rex Join Date: Jan 2001 Location: San Marcos, TX Posts: 27,368 Images: 513	From the operator's manual: Flange back adjustment of the lens 1) Mount the camcorder on a tripod. Select an object 2-3 m away from the lens, or an object about the same distance away from the lens as your subject. Use a subject with high contrast so it will be easy tell when focus is achieved. 2) Turn the IRIS/SELECT Dial to open the aperture. 3) Zoom all the way in to full telephoto. 4) Turn the focusing ring and focus on the object. 5) Zoom all the way out to full wide angle. 6) Fully release the flange back fixing screw on the lens (counterclockwise). 7) Turn the flange back ring until you obtain correct focus (H) The approximate position is where the flange back adjustment indicator is aligned with “F.B”. 8) Repeat steps 3) to 7) until you obtain the correct focus on both ends. 9) Tighten the flange back fixing screw with the ring set in proper position (clockwise). Hope this helps, __________________ CH Search DV Info Net \| 20 years of DVi \| ...Tuesday is Soylent Green Day!

February 22nd, 2005, 01:41 PM	#4
Chris Hurd Obstreperous Rex Join Date: Jan 2001 Location: San Marcos, TX Posts: 27,368 Images: 513	Richard Alvarez -- geez! We were posting the same thing at the same time! __________________ CH Search DV Info Net \| 20 years of DVi \| ...Tuesday is Soylent Green Day!

February 22nd, 2005, 01:37 PM	#2
Richard Alvarez Inner Circle Join Date: Sep 2002 Location: San Mateo, CA Posts: 3,840	Mount the camcorder on a tripod. Select an object 2-3m away from the lens, or an object about the same distancs away from the lens as the subject you want to shoot. 1) Use a subject with HIGH CONTRAST so it will be easy to tell when focus is achieved. (I reccomend using a black and white graphic on a large poster board, with fine lines in it) 2) Turn the IRIS/SELECT dial to open the aperture 3) Zoom all the way in to full telephoto 4) Turn the focusing ring and focus on the object 5) Zoom all the way out to full wide angle 6) Fully release the flange back fixing screw on the lens (counterclockwise) 7) Turn the flange ring until you obtain correct focus (The approximate position is where the flange back adjustment indicator is alligned with "F.B." marked on the lens) 8) Repeat steps 3 to 7 untill you obtain the correct focus on both ends. 9) Tighten the flange back fixing screw with the ring set in proper position. (Clockwise)

February 22nd, 2005, 01:47 PM	#5
Richard Alvarez Inner Circle Join Date: Sep 2002 Location: San Mateo, CA Posts: 3,840	Chris, I assume my manual was only marginally closer to the keyboard than yours! R

February 23rd, 2005, 11:44 AM	#6
James Clarke Regular Crew Join Date: Apr 2003 Location: BARBADOS Posts: 125 Images: 4	thanks guys ajustments are worked great its nice to know that this forum his here to adddress your every need

February 23rd, 2005, 12:11 PM	#7
Richard Alvarez Inner Circle Join Date: Sep 2002 Location: San Mateo, CA Posts: 3,840	No sweat James... but just for the record, Not your EVERY need...