Matte Box + AF<>Manual<>AF at DVinfo.net

Graham Bernard · November 14th, 2006, 01:52 AM

Having seen where a matte box fits, could somebody try this out WITH Auto (PUSH) Focus <> Manual Focus? Please?

TIA - Grazie

Noel Evans · November 15th, 2006, 07:51 AM

Im using a mattebox though all my focus is manual.

Graham Bernard · November 15th, 2006, 08:05 AM

Understood. But CAN you momentarily apply AF? Once applied can you go BACK to MF? I do this with my Manfrotto 521Pro LANC. I'm wishing to know if using a MB does it get in the way of AF?

Chris Hurd · November 15th, 2006, 08:05 AM

I think Grazie is asking for a test, from somebody who has a matte box on their XH (Noel?). It seems that the Push AF button uses the Instant Autofocus feature; at least that's what we've heard. Obviously the I.AF feature is disabled whenever a matte box or other lens attachment blocks that sensor . So the question is, with the I.AF sensor blocked by a matte box, what happens when the Push AF button is pressed while the camera is in Manual Focus mode? My guess is that the Push AF button reverts to Normal AF if the Instant AF is unavailable. Who wants to test this?

Graham Bernard · November 15th, 2006, 08:06 AM

Thank you Chris! My Hero!! Exactly that.

Michael Wisniewski · November 15th, 2006, 09:06 AM

I think there might be a way to assign a custom button as a toggle for the standard autofocus. That may be the solution for those wanting to use a matte box or wide angle lens. I wonder if there's a way to re-assign the Push AF button.

Bill Pryor · November 15th, 2006, 11:06 AM

Noel, what mattebox are you using?

Raymond Toussaint · November 17th, 2006, 03:20 PM

To ask the Q again:
If you block the Instant Autofocus sensor (with a mattebox or test it with some tape), what is happening with the Push AF button?

The autofocus is using two sytems:
1) Distance reading with the instant autofocus sensor
2) and then with the second autofocus system.

What is happening if you block the IAF sensor?

What happens when the Push AF button is pressed while the camera is in Manual Focus mode and the IAF sensor is blocked??

Noel Evans · November 17th, 2006, 04:27 PM

Ill check it out this morning and report back. Im pretty sure though the IAF does not work with a mattbox attached, however the AF does.

Chris Hurd · November 17th, 2006, 04:59 PM

It's established that I.AF does not work with a mattbox attached. The only question is, how does that affect the Push AF button.

Noel Evans · November 17th, 2006, 10:58 PM

I can verify push AF button works with mattebox. Ill post a 3-4 second clip later... setting up for a lit shot atm.

Raymond Toussaint · November 20th, 2006, 02:02 PM

So then it is using the 'classic' AF system that remains operative, thanks for now!

November 14th, 2006, 01:52 AM	#1
Graham Bernard Old Boot Join Date: Aug 2002 Location: London UK Posts: 3,633	Matte Box + AF<>Manual<>AF Having seen where a matte box fits, could somebody try this out WITH Auto (PUSH) Focus <> Manual Focus? Please? TIA - Grazie

November 15th, 2006, 08:05 AM	#4
Chris Hurd Obstreperous Rex Join Date: Jan 2001 Location: San Marcos, TX Posts: 27,368 Images: 513	I think Grazie is asking for a test, from somebody who has a matte box on their XH (Noel?). It seems that the Push AF button uses the Instant Autofocus feature; at least that's what we've heard. Obviously the I.AF feature is disabled whenever a matte box or other lens attachment blocks that sensor . So the question is, with the I.AF sensor blocked by a matte box, what happens when the Push AF button is pressed while the camera is in Manual Focus mode? My guess is that the Push AF button reverts to Normal AF if the Instant AF is unavailable. Who wants to test this? __________________ CH Search DV Info Net \| 20 years of DVi \| ...Tuesday is Soylent Green Day!

November 15th, 2006, 09:06 AM	#6
Michael Wisniewski Wrangler Join Date: Jul 2002 Location: Makati, Metro Manila Posts: 2,706 Images: 32	I think there might be a way to assign a custom button as a toggle for the standard autofocus. That may be the solution for those wanting to use a matte box or wide angle lens. I wonder if there's a way to re-assign the Push AF button. __________________ "Ultimately, the most extraordinary thing, in a frame, is a human being." - Martin Scorsese

November 17th, 2006, 04:59 PM	#10
Chris Hurd Obstreperous Rex Join Date: Jan 2001 Location: San Marcos, TX Posts: 27,368 Images: 513	It's established that I.AF does not work with a mattbox attached. The only question is, how does that affect the Push AF button. __________________ CH Search DV Info Net \| 20 years of DVi \| ...Tuesday is Soylent Green Day!

November 15th, 2006, 07:51 AM	#2
Noel Evans Regular Crew Join Date: Feb 2006 Location: Tokyo, Japan Posts: 157	Im using a mattebox though all my focus is manual.

November 15th, 2006, 08:06 AM	#5
Graham Bernard Old Boot Join Date: Aug 2002 Location: London UK Posts: 3,633	Thank you Chris! My Hero!! Exactly that.

November 15th, 2006, 11:06 AM	#7
Bill Pryor Contributor Join Date: Jan 2003 Location: Kansas City, MO Posts: 4,449	Noel, what mattebox are you using?

November 17th, 2006, 03:20 PM	#8
Raymond Toussaint Regular Crew Join Date: Nov 2005 Posts: 173	To ask the Q again: If you block the Instant Autofocus sensor (with a mattebox or test it with some tape), what is happening with the Push AF button? The autofocus is using two sytems: 1) Distance reading with the instant autofocus sensor 2) and then with the second autofocus system. What is happening if you block the IAF sensor? What happens when the Push AF button is pressed while the camera is in Manual Focus mode and the IAF sensor is blocked??

November 17th, 2006, 04:27 PM	#9
Noel Evans Regular Crew Join Date: Feb 2006 Location: Tokyo, Japan Posts: 157	Ill check it out this morning and report back. Im pretty sure though the IAF does not work with a mattbox attached, however the AF does.

November 17th, 2006, 10:58 PM	#11
Noel Evans Regular Crew Join Date: Feb 2006 Location: Tokyo, Japan Posts: 157	I can verify push AF button works with mattebox. Ill post a 3-4 second clip later... setting up for a lit shot atm.

November 20th, 2006, 02:02 PM	#12
Raymond Toussaint Regular Crew Join Date: Nov 2005 Posts: 173	So then it is using the 'classic' AF system that remains operative, thanks for now!