Longitudinal Colour Corrector

Steve Phillipps · May 16th, 2008, 07:33 AM

When HD first hit the big time Optex introduced a Longitudinal Colour Corrector, which was said to make film lenses useable on HD cameras by changing the way the light was focussed on the 3 CCDs (with film lenses it focusses to a single plane only). Now at the time I thought it was a load of tosh and just a way to make money by selling something that we don't really need. Anyone have much experience with using one though? I've used Canon 300 and 150-600 on Sony 750/Varicam and thought the images looked OK, but just wondering if I'm missing something?
Steve

George Kroonder · May 16th, 2008, 02:40 PM

No experience with it, but I'm with you on the 'tosh' wagon.

There's a very good seminar on HD optics and sensors by John Galt, Head of Advanced Digital Imaging at Panavision, and Larry Thorpe (Canon Broadcast): Demystifying Digital Camera Specifications

It gives a good overview of the challenges for HD glas, touches on 1 vs 3 imager system, bayer sensors and on how MTF really defines system quality over the different comonents.

I can wholly recomend it.

George/

Steve Phillipps · May 16th, 2008, 03:05 PM

Thanks George, I've seen it via a link on REDUser. I agree, it's well worth a look if only to give an overview of general principles.
Steve

May 16th, 2008, 07:33 AM	#1
Steve Phillipps Major Player Join Date: Apr 2006 Location: Wales Posts: 547	Longitudinal Colour Corrector When HD first hit the big time Optex introduced a Longitudinal Colour Corrector, which was said to make film lenses useable on HD cameras by changing the way the light was focussed on the 3 CCDs (with film lenses it focusses to a single plane only). Now at the time I thought it was a load of tosh and just a way to make money by selling something that we don't really need. Anyone have much experience with using one though? I've used Canon 300 and 150-600 on Sony 750/Varicam and thought the images looked OK, but just wondering if I'm missing something? Steve

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May 16th, 2008, 02:40 PM	#2
George Kroonder Major Player Join Date: Jan 2008 Location: Utrecht, NL \| Europe 3rd Rock from the Sun Posts: 576	No experience with it, but I'm with you on the 'tosh' wagon. There's a very good seminar on HD optics and sensors by John Galt, Head of Advanced Digital Imaging at Panavision, and Larry Thorpe (Canon Broadcast): Demystifying Digital Camera Specifications It gives a good overview of the challenges for HD glas, touches on 1 vs 3 imager system, bayer sensors and on how MTF really defines system quality over the different comonents. I can wholly recomend it. George/

May 16th, 2008, 03:05 PM	#3
Steve Phillipps Major Player Join Date: Apr 2006 Location: Wales Posts: 547	Thanks George, I've seen it via a link on REDUser. I agree, it's well worth a look if only to give an overview of general principles. Steve