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new ASA rating for Z1 with Mini35


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#1 Nadav Hekselman

Nadav Hekselman
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Posted 01 January 2007 - 09:05 AM

Hi all,

Im about to start shooting a drama-short using the mini35 adaptor and HDV-Z1.

i rated the camera at about 160 ASA but when i put on the Adaptor i have to zoom in to full tele and i end up with 2.8f on the Z1 lens. how should i rate the camera now than?

It seems logical to me that if the most open iris on the Z1 is 1.6 and i take it down to 2.8, i lose 1 and 2/3 stops, which take the 160 ASA down to 50 ASA, and i use the 35 lenses iris for calcualting... but this doesnt seem right when i measure the light. it seems overexposed. i guess the adaptor itself takes out some light and i need to rate it even less.... cant find nothing about it on p+s technick site...

can anyone help?
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#2 Matt Sandstrom

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Posted 01 January 2007 - 05:38 PM

you mean it seems underexposed, right? anyway, just use whatever asa setting that works. shoot a grey card and check the levels if you're uncertain. there's no mathematical formula that can ever give you the correct light loss factor of a 35mm adapter.

also, a much better strategy for using such an adapter is to set the f-stop on the 35mm lens to a fixed number and adjust the camera aperture instead. much more control without any weird dof changes, plus at some apertures you may start seeing the grain in the ground glass.

/matt
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