Does the focal length rule apply in video mode?

Mathieu Kassovitz · January 30th, 2009, 07:10 PM

Yes, a ND filter is the solution. Although, it seems there isn't any solution for the focal length = shutter speed rule. Unless, the manual mode or twisted lens.

Toenis Liivamaegi · January 30th, 2009, 07:17 PM

Chris, how can you get ISO 800 with 1/50 shutter with EF lenses other than with the 50mm one?

Maybe it's all the same from 30th to 100th shutter but I'm loosing more light with 1.2 85mm than with 50mm 1.8 because the apparent focal length to shutter speed rule.

Rack focusing is also almost impossible with USM fulltime electronic manual focus that might be the case of 1.2 L only. Straight from the cam http://www.autonomicum.com/forums_up/MVI_0017_bela.MOV (hear the inconstancy of my hand turning the electronic focusing barrel).

T

Mathieu Kassovitz · January 30th, 2009, 07:24 PM

Quote:

Originally Posted by Jon Fairhurst

The risk is that the tape falls off and gums up your shutter or sensor. I taped a cheap lens - and now I have no idea where the tape ended up.

I like the mylar ring idea much better. Maybe some holes can be cut for power. The key is to find a way to keep it from rotating.

Tape or mylar. You are correct. The mylar ring idea is better.

Christopher Witz · January 30th, 2009, 07:35 PM

Quote:

Originally Posted by Toenis Liivamaegi

Chris, how can you get ISO 800 with 1/50 shutter with EF lenses other than with the 50mm one?

Maybe it's all the same from 30th to 100th shutter but I'm loosing more light with 1.2 85mm than with 50mm 1.8 because the apparent focal length to shutter speed rule.

Rack focusing is also almost impossible with USM fulltime electronic manual focus that might be the case of 1.2 L only. Straight from the cam http://www.autonomicum.com/forums_up/MVI_0017_bela.MOV (hear the inconstancy of my hand turning the electronic focusing barrel).

T

I've been seeing 1/30th most of the time with my 85 1.2 II....

Mathieu Kassovitz · January 31st, 2009, 01:09 PM

There is who has mentioned the focal length = auto shutter speed rule is misleading because it applies only for taking pictures during video recording. Is that so?

Manual Control. The Truth !

Shutter, Aperture, ISO-Display: Are they all wrong?

January 30th, 2009, 07:17 PM	#17
Toenis Liivamaegi Major Player Join Date: Nov 2005 Location: Tartu, Estonia Posts: 579	Back to the topic Chris, how can you get ISO 800 with 1/50 shutter with EF lenses other than with the 50mm one? Maybe it's all the same from 30th to 100th shutter but I'm loosing more light with 1.2 85mm than with 50mm 1.8 because the apparent focal length to shutter speed rule. Rack focusing is also almost impossible with USM fulltime electronic manual focus that might be the case of 1.2 L only. Straight from the cam http://www.autonomicum.com/forums_up/MVI_0017_bela.MOV (hear the inconstancy of my hand turning the electronic focusing barrel). T

January 30th, 2009, 07:10 PM	#16
Mathieu Kassovitz Major Player Join Date: Apr 2006 Location: paris Posts: 289	Yes, a ND filter is the solution. Although, it seems there isn't any solution for the focal length = shutter speed rule. Unless, the manual mode or twisted lens.

January 31st, 2009, 01:09 PM	#20
Mathieu Kassovitz Major Player Join Date: Apr 2006 Location: paris Posts: 289	There is who has mentioned the focal length = auto shutter speed rule is misleading because it applies only for taking pictures during video recording. Is that so? Manual Control. The Truth ! Shutter, Aperture, ISO-Display: Are they all wrong?