Ektachrome at night - best strategy + color effect filter

[Mendes Nabil]

Hello all,

I'm about to shoot Ektachrome E100 (daylight balanced film) at night on Hasselblad medium format.
I will have two tungsten sources, one with a Tokyo blue filter, one without.

Two strategies to convert my daylight stock to tungsten :

Strategy 1 : 80A filter on the lens.

Issues :
1 : I don't know how much light does my 80A filter cuts "exactly", Ektachrome being a slide film, no error is allowed..
2 : It might introduce some flare or ghost effect
3  :My viewfinder will get dimmer which is an issue at night

Advantage: the ambiant tungsten lights will also be corrected

Strategy 2 : Gelling my two sources with CTB. 

Issues : 
1 : stacking up a ctb + tokyo blue effect is not a combo i'm sure about
2 : Ambient practical light will not get corrected (They will be minor in the scene)

Advantages : No flare issue, and clear viewfinder


What would be your strategy?


Thank you all,

[Mark Dunn]

The 80A absorbs 2 stops, so you would meter at 25 with the filter on the camera. An undamaged filter shouldn't cause flare and if you use a filter holder you can line up your shot then drop the filter in for exposure.

Gelling the lights will likewise cost 2 stops so unless you have a larger wattage lamp you will need to increase your exposure, but you will be metering at 100.