No. 85 filter and Beaulieu cams
Moderator: Andreas Wideroe
No. 85 filter and Beaulieu cams
I've heard that with Beaulieu 6008, 7008 and 9008 series cams you should always use Tungsten film speed. For example, with Kodacrome 40 Type A film one would set it to 40 with or without No. 85 filter. Is this right?
You don't have to use tungsten balanced film in these cameras or any other cameras for that matter, you can use daylight balanced film too if you can get it e.g. pro8mm neg stocks.
But when shooting with K40 outdoors in daylight you should always have an 85 filter on your lens and rate the the exposure at 25, not 40, 40 ISO is when you are shooting with indoor tungsten light without the need for a filter. The 85 filter restores the colour balance of the film for daylight otherwise it would look very blue and cold.
You need to rate the film at 25 ISO in daylight because using the 85 filter cuts down on the amount of light reaching the film by 2/3rds of a stop, making the film slower; rating your film at the lower speed of 25 ISO compensates for the light loss but the film needs more exposure which is easier to achieve when working in bright daylight.
But when shooting with K40 outdoors in daylight you should always have an 85 filter on your lens and rate the the exposure at 25, not 40, 40 ISO is when you are shooting with indoor tungsten light without the need for a filter. The 85 filter restores the colour balance of the film for daylight otherwise it would look very blue and cold.
You need to rate the film at 25 ISO in daylight because using the 85 filter cuts down on the amount of light reaching the film by 2/3rds of a stop, making the film slower; rating your film at the lower speed of 25 ISO compensates for the light loss but the film needs more exposure which is easier to achieve when working in bright daylight.
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Ericus
- Posts: 82
- Joined: Sat May 03, 2003 5:15 pm
- Real name: Erkki Tikkanen
- Location: Arctic Circle, Finland
With 85 filter - it is not the camera 6008, 7008 or 9008, it is the lens you are using. E.g. the Schneider 6-70 has an internal 85 filter, Angenieux 6-90 not. You can use both lenses with each of above Beaulieus.
With K40 you always use "tungsten" film speed, inside or outside. Outside you just use your 85 filter.
From the Beaulieu 7008 manual: "Whatever the position of the filter, always bring the index on film speed control opposite the "tungsten" speed of your film (e.g. 40 in case of Kodachrome 40 ISO).
Ericus
With K40 you always use "tungsten" film speed, inside or outside. Outside you just use your 85 filter.
From the Beaulieu 7008 manual: "Whatever the position of the filter, always bring the index on film speed control opposite the "tungsten" speed of your film (e.g. 40 in case of Kodachrome 40 ISO).
Ericus
Tungsten / daylight film speed
Sorry about being bit unclear with my question. I know the filters, it's the film speeds on Beaulieus I'm bit baffled about. As explained by Ericus film speed on Beaulieu 7008 with K40 is always 40 ISO, even if its 3200 k or 5600 k lighting. Why is this?Ericus wrote: With K40 you always use "tungsten" film speed, inside or outside. Outside you just use your 85 filter.
From the Beaulieu 7008 manual: "Whatever the position of the filter, always bring the index on film speed control opposite the "tungsten" speed of your film (e.g. 40 in case of Kodachrome 40 ISO).
Ericus
Yes I forgot, you are right about setting the ISO at 40 when using the 85 filter on the front of the lens because the meter will read the 2/3rd of a stop difference because the filter is in front of the meter whereas in some of the older Beaulieu models (4008) the 85 filter is built in behind the meter so it can't read the proper exposure without setting the meter dial to 25 to compensate for the 2/3rd of a stop light loss.
So do set the lightmeter at 40 ISO with the later Beaulieu 6008-9008 models, the meter will see the light loss through the lens and just indicate to open a stop or so more of exposure.
So do set the lightmeter at 40 ISO with the later Beaulieu 6008-9008 models, the meter will see the light loss through the lens and just indicate to open a stop or so more of exposure.
That explains it. Thanks Escubria!escubria wrote:Yes I forgot, you are right about setting the ISO at 40 when using the 85 filter on the front of the lens because the meter will read the 2/3rd of a stop difference because the filter is in front of the meter whereas in some of the older Beaulieu models (4008) the 85 filter is built in behind the meter so it can't read the proper exposure without setting the meter dial to 25 to compensate for the 2/3rd of a stop light loss.
I have heard that with some Beaulieu 4008 cams, the original 85 filter has deteriorated with age and can degrade the image quality. What is frustrating is that you can't simply remove the internal filter and screw an external 85 filter on to the front of the lens. Apparently, the position of the built in filter is necessary for light transmission or something. To replace the deformed built in filter with a new, clean internal filter involves taking the camera apart by a specialist technician and that costs hundreds of $$$. I wish there was a better way!