ANSI standards for filmholders?

[michael_mutmansky1]

Hello all,

 

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I am intrested in finding out if there are ANSI standards for banquet format filmholders. Specificly 7x17.

 

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I did some searches on the ANSI.ORG site, which linked to another site for ordering, but the only listings that I saw were for radiographic film holders, which are a bit different, and anyway, not available in 7x17 format.

 

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Does anyone out there have the dimensional requirements for a 7x17 holder, per ANSI?

 

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Thanks,

[michael_mutmansky1]

Further search on through the links reveals this ANSI

document.

 

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ANSI/PIMA IT3.108-1998 Photography (Accessories) - Double Film Holders

of the Lock-Rib Type - Dimensions (revision and redesignation of

ANSI PH3.108-1988)

 

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Does anyone know if this is going to cover a 7x17 holder? For $21.00,

I'm not intrested in buying this only to have it not cover.

Ultimately, I just want to be able to check some holders, etc. to a

standard, not build any, so a few simple dimensions will do me.

 

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Thanks,

[carl_weese]

Banquet camera holders aren't standardised like 4x5, 8x10, etc. You

can't use Korona holders in a Folmer & Schwing, for example. Best bet

would be to take accurate measurements from an existing holder, and

bear in mind they may be different for another camera.---Carl

[michael_mutmansky1]

Carl,

 

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That what I thought, but I was just told by a representative from

Lotus that their holders meet the ANSI specs. I am trying to figure

out what that means.

 

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I'll post some information on this once I've gotten it figured out.

In the meantime, if anyone has any specific ANSI information that

relates to this, I would appreciate an email.

 

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Thanks,

[geoffrey_chen]

Do folks at Lotus use ISO, instead of ANSI? I know NIST in

Gaithersburg, MD issues standards for film holders used in medical

products, not in general photography. I suggest you email Kerik

Kouklis. He teaches 7x17 format photography

(http://www.anseladams.com/workshops/feb.html).

[julio_fernandez]

Michael: Different ANSI standards apply to different film size

formats. On 4X5, the ISO and ANSI standards differ -from memory, in

the 4th decimal place. What is important here is not so much the

difference but the fact that the two are not precisely the same, and

that the difference between the two is what Sinar allows for film

curl (on 4X5).

As for 7X17, I think it is possible but most unlikely that there are

any standards, since standards are about standard things and this, is

by definition is non-standard format. Ultimately the standard is of

no consequence whatsoever, as long as the ground glass for your

camera can be adjusted to exactly the depth of the film holders. If

the two do not agree you have a problem if your camera's GG is not

adjustable. PS: testing a 7X17 holder depth I would guess not to be

a piece of cake; you will need a FLAT perforated aluminum plate

somewhat larger, ground to less than 0.001".