Focus issue solved, faulty camera now replaced

Tom Roper · January 1st, 2007, 12:13 PM

We're sorry, Canon A1 needs to close. Would you like to send a report to Microsoft?

But seriously, the focus speed preset might be an answer for the pulsing. I'm also wondering if servo vibrations while on the tripod have anything to do with it. I can't see any pulsing on handheld with OIS enabled.

Michael Mann · January 1st, 2007, 03:10 PM

Quote:

Originally Posted by Tom Roper

... the focus speed preset might be an answer for the pulsing.

Yes, indeed. I never changed the default AF response speed to see if the pulsing might disapperar. But I will test this. Thanks for your proposal, Jay.

Quote:

Originally Posted by Tom Roper

I can't see any pulsing on handheld with OIS enabled.

I do, Tom. All my "pulsing" slow zoom shots were handheld with OIM on. But I will test slow zooming with OIM switched off.

Tom Roper · January 1st, 2007, 06:15 PM

Quote:

Originally Posted by Michael Mann

I do, Tom. All my "pulsing" slow zoom shots were handheld with OIM on. But I will test slow zooming with OIM switched off.

Okay then. I have to look closer for that.

Michael Mann · January 2nd, 2007, 08:51 AM

Meanwhile I have done some slow zooms with AF switched off - no focus pulsing anymore. So far, so good. Then I turned my focus ring and ... nothing happend:

I cannot change my manual focus while zooming!

Please help! I must have overseen something, right?

Philip Williams · January 2nd, 2007, 08:52 AM

Quote:

Originally Posted by Michael Mann

Meanwhile I have done some slow zooms with AF switched off - no focus pulsing anymore. So far, so good. Then I turned my focus ring and ... nothing happend:

I cannot change my manual focus while zooming!

Please help! I must have overseen something, right?

Nope, you can't focus and zoom at the same time. One motor for both functions I believe, so you can do one or the other.

Michael Mann · January 2nd, 2007, 09:00 AM

Quote:

Originally Posted by Philip Williams

Nope, you can't focus and zoom at the same time. One motor for both functions I believe, so you can do one or the other.

Darned! That's bad. And the manual does not say anything about this limitation.

Chris Hurd · January 2nd, 2007, 09:29 AM

I'm not so sure that the explanation of "one motor for both functions" is correct, but the fact remains that you can't zoom and focus at the same time on any DV or HDV camcorder that has an auto servo lens.

Michael Mann · January 2nd, 2007, 09:43 AM

Quote:

Originally Posted by Chris Hurd

... you can't zoom and focus at the same time on any DV or HDV camcorder that has an auto servo lens.

I didn't know that. Thanks, Philip and Chris.

Tom Roper · January 2nd, 2007, 10:53 AM

I put my right hand inside the wrist strap to hold the cam, my left hand underneath for support with my thumb on the zoom ring. Then I use my third hand to operate the focus ring. Is this how you are doing it?

Chris Hurd · January 2nd, 2007, 11:00 AM

At last Tom, you admit to being a mutant. I had my suspicions all along.

My own technique is left hand under the lens, thumb and first finger on either side of the focus ring. Second finger on the right side of the zoom ring, up behind the XLR block. Third finger on the iris ring if needed.

Michael Mann · January 2nd, 2007, 11:11 AM

Quote:

Originally Posted by Tom Roper

I put my right hand inside the wrist strap to hold the cam, my left hand underneath for support with my thumb on the zoom ring. Then I use my third hand to operate the focus ring. Is this how you are doing it?

Sure, Tom, normally I would have done so ...
No, seriosly: I was zooming with the upper lever (speed 3) and turning the manual focus ring at the same time trying to make a focus "jump".

Brad Tyrrell · January 2nd, 2007, 12:34 PM

Quote:

Originally Posted by Chris Hurd

My own technique is left hand under the lens, thumb and first finger on either side of the focus ring. Second finger on the right side of the zoom ring, up behind the XLR block. Third finger on the iris ring if needed.

Aha! Your hand is attached upside down!

Actually, I'm almost always on a tripod and like my index finger close to the AF button so I do it the other way round.

Just KNEW you wanted and needed that info.

Tom Roper · January 2nd, 2007, 03:01 PM

Quote:

Originally Posted by Chris Hurd

At last Tom, you admit to being a mutant. I had my suspicions all along.

My own technique is left hand under the lens, thumb and first finger on either side of the focus ring. Second finger on the right side of the zoom ring, up behind the XLR block. Third finger on the iris ring if needed.

Lol...

I'm going to try that, but 3 or 4 fingers operating the rings is guitar-like dexterity I don't have, plus you have to get accurate focus feedback from the eye and maintain the framing. Would you really juggle those 3 rings together at once?

Michael Mann · January 3rd, 2007, 03:15 AM

Meanwhile I did some tests to check whether AF response speed (low, middle, high) has any influence on the frequency of the focus pulsing:

My first impression is, that it has no influence.

Alex Leith · January 3rd, 2007, 04:32 AM

Quote:

Originally Posted by Tom Roper

Would you really juggle those 3 rings together at once?

Oh for a double armed tripod, with focus demand under one hand and zoom demand under the other.

January 2nd, 2007, 08:51 AM	#79
Michael Mann Major Player Join Date: Dec 2005 Location: Kelkheim, Germany Posts: 375	Cannot change manual focus while zooming! Meanwhile I have done some slow zooms with AF switched off - no focus pulsing anymore. So far, so good. Then I turned my focus ring and ... nothing happend: I cannot change my manual focus while zooming! Please help! I must have overseen something, right? __________________ Michael

January 2nd, 2007, 09:29 AM	#82
Chris Hurd Obstreperous Rex Join Date: Jan 2001 Location: San Marcos, TX Posts: 27,366 Images: 513	I'm not so sure that the explanation of "one motor for both functions" is correct, but the fact remains that you can't zoom and focus at the same time on any DV or HDV camcorder that has an auto servo lens. __________________ CH Search DV Info Net \| 20 years of DVi \| ...Tuesday is Soylent Green Day!

January 2nd, 2007, 11:00 AM	#85
Chris Hurd Obstreperous Rex Join Date: Jan 2001 Location: San Marcos, TX Posts: 27,366 Images: 513	At last Tom, you admit to being a mutant. I had my suspicions all along. My own technique is left hand under the lens, thumb and first finger on either side of the focus ring. Second finger on the right side of the zoom ring, up behind the XLR block. Third finger on the iris ring if needed. __________________ CH Search DV Info Net \| 20 years of DVi \| ...Tuesday is Soylent Green Day!

January 3rd, 2007, 03:15 AM	#89
Michael Mann Major Player Join Date: Dec 2005 Location: Kelkheim, Germany Posts: 375	Does AF response speed influence focus pulsing? Meanwhile I did some tests to check whether AF response speed (low, middle, high) has any influence on the frequency of the focus pulsing: My first impression is, that it has no influence. __________________ Michael

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

January 1st, 2007, 12:13 PM	#76
Tom Roper Trustee Join Date: Jun 2004 Location: Denver, Colorado Posts: 1,891	We're sorry, Canon A1 needs to close. Would you like to send a report to Microsoft? But seriously, the focus speed preset might be an answer for the pulsing. I'm also wondering if servo vibrations while on the tripod have anything to do with it. I can't see any pulsing on handheld with OIS enabled.

January 2nd, 2007, 10:53 AM	#84
Tom Roper Trustee Join Date: Jun 2004 Location: Denver, Colorado Posts: 1,891	I put my right hand inside the wrist strap to hold the cam, my left hand underneath for support with my thumb on the zoom ring. Then I use my third hand to operate the focus ring. Is this how you are doing it?