8mm Forum: Homemade filters

This is topic Homemade filters in forum 8mm Forum at 8mm Forum.

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Posted by Chad Shumaker (Member # 2384) on July 12, 2013, 09:36 PM:

I read online about people placing gels in front of their projectors to correct reddish reels. I gave it a try and purchased a pale yellow and a pale blue.

The gels arrived yesterday and I tried them out on a red print of The Sound of Music I have and found that both gels together made the color look better. My question is- should I just buy a pale green gel to achieve the same correction?

I noticed that two gels darken the picture just a bit, my logic is that one would do the same thing and allow more light thru.

Suggestions?

Posted by Steve Klare (Member # 12) on July 12, 2013, 10:57 PM:

It sounds like a compromise: the filter works by blocking the light you don't want, but that light contributed to the brightness of the image, but if you change the filter to allow more brighness, you get less color correction.

Short of a brighter lamp and a faster lens, you'll need to fish around and find some compromise of brightness and color correction you can be happy with.

You can't have it all! (-at least not all at once!)

Posted by Hugh Thompson Scott (Member # 2922) on July 13, 2013, 06:56 AM:

Hi Chad, I've found that a blue takes the fire out of the print,and the yellow
adds tone, especially to flesh and green (foliage) colours.

Posted by Janice Glesser (Member # 2758) on July 13, 2013, 11:17 AM:

I have a set of 3 filters and a holder that fits over the lens I bought from a guy on eBay. They are all shades of blue that I use in different combination depending on the film I'm projecting. Where are you getting the gel material? I'd like to try using yellow to see the effect.

Posted by Hugh Thompson Scott (Member # 2922) on July 13, 2013, 12:40 PM:

Jan I'll search out my gel supplier, and get back.

Posted by Lee Bombard (Member # 3740) on July 14, 2013, 12:51 AM:

I too purchased these filters off of eBay. They came from a guy named Rick from back in North Carolina I think.
I've been in touch with him and he also offers yellow and peach filters too. I've asked him for pricing details.
By the way I got my hands on some yellow cellophane today and tried that but it wasn't transparent enough and just made the image blurry.

UPDATE - $20.96 for a set of the yellow filters and the peach filters... Ill report back once I get them.

Posted by Maurice Leakey (Member # 916) on July 14, 2013, 05:26 AM:

This is on the 8mm Forum, should it not be on the 16mm Forum as bad colour prints are more likely to be on 16mm?

Here is a link to Hoya filters.

http://www.hoyafilter.com/hoya/products/cat/Colored%20Filters/

Whilst they are obviously for cameras there seems no reason why they could not used for projectors. I just checked the f1.2 lens on my Bell & Howell 644 and it has a screw thread which seems to measure 52mm. Perhaps such threads are standard?

Posted by Janice Glesser (Member # 2758) on July 14, 2013, 12:40 PM:

Maurice, I think this filter topic spans across both 8mm and 16mm formats. I have plenty of 8mm films that have turned reddish. The lens I'm using in my 16mm projector is a 25mm 1.5in lens (probably from a 8mm projector) with an adapter to fit in my Elmo 16CL.

Posted by Hugh Thompson Scott (Member # 2922) on July 14, 2013, 01:03 PM:

Hi Jan, I checked, and mine were made by Roscoe and supplied
by Stage Electrics. There are a number of companies that supply
them inc. terralec.co.uk & LEE Filters. On ebay uk now, just type
in coloured lighting gels, and there are collections you can buy for a few pounds. They are in sheets and not expensive.

Posted by Janice Glesser (Member # 2758) on July 14, 2013, 02:28 PM:

Thanks Hugh...I think I'll wait to hear how Lee likes the yellow filters he has ordered from Richard Meyers.

Posted by Maurice Leakey (Member # 916) on July 14, 2013, 02:52 PM:

Janice
You must have very different weather from where I live in England. I don't think any of my super 8 colour films have actually turned, although some have a slight fade.

Posted by Hugh Thompson Scott (Member # 2922) on July 14, 2013, 03:20 PM:

That's true Maurice, living in a temperate climate sometimes has
it's advantages, but I often buy a faded print of a favoured film,
so a bit of correction does help.

Posted by Adrian Winchester (Member # 248) on July 14, 2013, 08:11 PM:

Maurice - you're VERY lucky and I'd imagine that your collection can't have much in the way of Universal 8 and pre-80s prints from certain other distributors. I have considerably more fader Super 8 films than 16mm.

Posted by Maurice Leakey (Member # 916) on July 15, 2013, 02:39 AM:

Adrian

Perhaps I am lucky, as I said, some of my Super 8 have slight colour fade, but nothing like a few of my 16mm prints.

If you want to buy sheets of stage lighting gels in the UK here is a link. Don't forget they are for stage use and may not be entirely suitable for film projection.

http://www.stagedepot.co.uk/lighting/gels?gclid=COm0wOj8sLgCFWbJtAodWUUA2g

Posted by Dominique De Bast (Member # 3798) on July 15, 2013, 04:52 AM:

I must be lucky, too, I have very few pink or red super 8 films.

Posted by Hugh Thompson Scott (Member # 2922) on July 15, 2013, 07:12 AM:

Terralec sell them ready made for 0.75 pence each.

Posted by Maurice Leakey (Member # 916) on July 15, 2013, 08:41 AM:

As mentioned by Hugh.

http://www.terralec.co.uk/lighting/gels__filters/11478_0c.html

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