ANSI Film Holder Details : LUSENET : Large format photography : One Thread

I know this has been asked before, but I couldn't find a suitable answer in the archives.

Where can I find the ANSI measurements (in millimetres, preferably)for a 5x4" film holder ?

Also, what is the normal thickness of film (Kodak Tri-x)?

Finally, I stripped down a 5x4" film holder a few years ago, but can't remember how the light-trap was constructed. Is it brushes, rubber or felt, or something else.

I'm planning to make some film holders that use a plate instead of film.

Thanks in advance.

David Nash

-- David Nash (, October 31, 2000


If you know the ANSI specification (or document number), you can go to and perform a search. You can search for other text, but you'll get narrowed results if you know the ANSI reference info.

You can also look up design information for particular manufacturers on the US Patent Office web site.

-- Chad Jarvis (, October 31, 2000.

The URL for the US Patent Office is

-- Chad Jarvis (, October 31, 2000.

Sorry for three in a row. These are the correct links:


-- Chad Jarvis (, October 31, 2000.

The ANSI document # is Z38.1.51-1951 Inasmuch as this is an American standard, the measurements are in inches. There should be a European standard as well. If you need a specific dimension, let me know and I'll look it up. The light trap is typically a piece of spring metal, cut in such a way as to create "fingers" and covered in velvet. It just press fits in such a way that it straddles the septum. This is just one type. Over the years as the style and materials changed, I'm sure there have been other designs. Hope this helps.

-- Robert A. Zeichner (, October 31, 2000.

Robert: Could not find the document you gave the number for in an ANSI search, however, I found the following in a search: 2E108%2D1998

There the following document is shown: Document Number: ANSI/PIMA IT3.108-1998 Photography (Accessories) - Double Film Holders of the Lock-Rib Type - Dimensions (revision and redesignation of ANSI PH3.108-1988)

-- Julio Fernandez (, November 01, 2000.

That sounds like it. I've obviously got an old, old document. But then again, my film holders are old.

-- Robert A. Zeichner (, November 02, 2000.

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