85 Filter

[technicolour]

I dont understand the deal with this 85 filter

When the camera is set up normally what sort of light is it optomised for?

My camera has a little screw thread on the top where the key goes, Do it want the key in while im filmming in daylight or movielight?

Does having the key in increase the asa to 85 asa?

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Jim

[Vurfer]

The Wratten No.85 Filter is a certain orange-tinted filter that converts daylight to tungsten (artificial) light.

Most Super8 stock such as the Kodachrome 40 is optimized to tungsten light, which means that if you use it in such light then the colours in your film will be correct.

If, however, you use a tungsten-light film in daylight, your film will look all blue. The 85-Filter compensates this and allows you to use an indoor film outside.

The effective ASA of a film is lowered with the filter. Kodachrome 40 for example drops from 40 to effectively 25 ASA.

Daniel

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[Vurfer]

Oh, and about the filter key ... the way I know it is that normally the Wratten85-Filter is in the optical path, enabling you to film in daylight.

And when you put in the filter key (for filming inside), the filter is pushed aside, effectively deactivating it.

I'm not entirely sure though and this could be different for every camera. Just tell us which camera you've got and someone is bound to know.

Daniel

[technicolour]

Daniel,

Thanks for your reply, My cameras a Chinon 256 XLS.

So when they key is in the filter is moved aside? Hopefully that is the case because ive done some filmming in daylight with the key out.

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Jim

[MovieStuff]

<BLOCKQUOTE><font size="1" face="Courier, Arial">quote:</font><HR>Originally posted by technicolour:

So when they key is in the filter is moved aside? Hopefully that is the case because ive done some filmming in daylight with the key out.
<HR></BLOCKQUOTE>

The screw you speak of also was used to attach a movie light. That way, when you attached the movie light to the top of your camera, the screw holding it in place would push the filter out of the way.

Roger

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Roger Evans
MovieStuff
http://www.afterimagephoto.tv/moviestuff.html

[technicolour]

Hey rodger,

Ingenious! (if thats how you spell it, which im sure its not!)

So how low lighting with K40 film in? With the key in does it increase the ASA to 40 so it will work better in lower light?


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Jim

[Vurfer]

40 ASA is the standard rating of Kodachrome 40, so that is its effective speed, IF you don't have any filters etc on or behind the lens, that eat up light (such as a 85-filter).

[Nigel]

Beware of in camera filters. I used to use them until I had them ruin many rolls of film. I use only screw on filters now for all of my Super8. Good Luck

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