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Panavision Primo L series


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#1 Edgar Dubrovskiy

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Posted 20 October 2009 - 12:58 PM

Hi!

What is idea behind two focus marks on the lens - one yellow and one blue?
Is focus measured from focal plane, or from front element on these series?

Thanks!
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#2 John Holland

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Posted 20 October 2009 - 01:21 PM

Have you ever known of any sort of lens where you measure focus from the front element ? And how about F and T stops ?
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#3 Edgar Dubrovskiy

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Posted 20 October 2009 - 01:29 PM

mm. yes. some Sony broadcast lenses.
it's just someone mentioned on this forum because of the size of the lenses, it comes down as more precise to actually measure from front on L series.
that's why I'm asking.

and what about F and T stops?

Edited by Edgar Dubrovskiy, 20 October 2009 - 01:30 PM.

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#4 Edgar Dubrovskiy

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Posted 20 October 2009 - 01:38 PM

Got the answer.

http://books.google....M...rel&f=false
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#5 Stephen Williams

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Posted 20 October 2009 - 02:21 PM

Hi,

I remember some PV lenses having 2 focus marks, near wide open used a different mark. Look to match the color of the T stop marks with the color of witness mark.

It's a long time since I used any PV lenses, but looking at the lenses it should become clear.

Sephen
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#6 Edgar Dubrovskiy

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Posted 20 October 2009 - 02:37 PM

Hi,

I remember some PV lenses having 2 focus marks, near wide open used a different mark. Look to match the color of the T stop marks with the color of witness mark.
Sephen


Yep. That's the answer, really.
It's just on some the extra mark was blue. On others - black.

Thanks!
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