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what ratio is this ground glass?


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#1 Joshua Dannais

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Posted 01 May 2008 - 01:50 AM

this is on a npr, optical electro house in culver did the s16 conversion... i tried to figure it out using a chart but couldn't get it lined up enough.... anybody know what it is? thanksDSC_001.jpg
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#2 Chris Keth

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Posted 01 May 2008 - 02:06 AM

It looks to me like a 1.85 with a 1.66 superimposed.

If you want to be super precise and check, shine a bright light through the eyepiece with the camera close to, parallel to, and focused on a wall. It will project the groundglass onto the wall large enough to comfortably measure. It's also the best way I know of to get really precise framing charts done in checkout, BTW.

Edited by Chris Keth, 01 May 2008 - 02:09 AM.

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#3 Joshua Dannais

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Posted 01 May 2008 - 02:58 AM

thanks chris... but are you talking about a flash light, or something like a hmi?
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#4 chuck colburn

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Posted 01 May 2008 - 04:50 AM

thanks chris... but are you talking about a flash light, or something like a hmi?


One of those xenon bulb type flashlights or one with a bright LED will work fine. A medium focale length lens wide open is good.
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#5 Joshua Dannais

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Posted 01 May 2008 - 10:24 AM

thanks... i'll give it a try
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#6 Deepak Bajracharya

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Posted 01 May 2008 - 06:35 PM

Namaste,

To me, this is the 1.85:1 but the superimposed marking lies somewhere arround 1.50, quite unusual.

Regards,
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#7 Deepak Bajracharya

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Posted 02 May 2008 - 06:57 PM

Namaste,

As I posted guessing it is 1.50:1 which will come to roughly equivalent of 14:9 and remembered the UK Dp ( location shooting in Nepal ) composing for 14:9 aspect ratio as he said most of the UK television stations demand for the composition within 14:9 as the safety for both the High def TV and 4:3 tv.

with best regards,
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#8 Mitch Gross

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Posted 03 May 2008 - 12:18 AM

It's a copy of the old Aaton "Combi" screen. The outermost box is thw full 1.66 frame of Super-16. The two vertical lines inside that represent the cutoff of 1.33 for TV. The centerpoint cross is self explanatory. TV 16x9 (1.77) is so close to the 1.66 as not to be worth marking. It is an extremely slight cropping on the top & bottom, about two line thicknesses on the shown ground glass.
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