Replacement septum material for 5"x7" holder.

eli griggs · Jul 29, 2023

I need to find or make a new septum (dark slide) for a 5"x7" sheet film holder and would like to hear suggestions for available materials.

Cheers

BradS · Jul 29, 2023

There was a time when I had extra dark slides for various models of both 5x7 and 4x5 film holders.
Unfortunately, I think I tossed 'em all in the trash long ago - couldn't give 'em away fifteen years ago.

AnselMortensen · Jul 29, 2023

CatLabs sold/sells? new replacement metal dark slides for 8x10 holders...not sure about 5x7.
I have seen Ebay listings for used 5x7 dark slides...

eli griggs · Jul 29, 2023

I suppose I could use blackened brass sheet material which I failed to consider prior, to this post.

It'll also be easier to fit out with a handle.

Thank both of you for your posts.

Kino · Jul 29, 2023

Black micarta sheeting.

Canvas Micarta Sheets

www.makermaterialsupply.com

The 1/16th thickness would do I would think...

Axelwik · Jul 29, 2023

Or get some junk film holders from ebay. Search "lowest price"

Don_ih · Jul 31, 2023

I just measured the thickness of one. It's definitely no more than 1/32" and possibly as little as 0.7mm (almost 0.1mm less than 1/32"). A good source for steel of that thickness: cheap cookie sheets. That's what I used when I made some film holders a few years ago.

Doremus Scudder · Jul 31, 2023

Just for clarity: The septum in a film holder is the central piece that the film slides into. It is built into the holder. The dark slide slides in from the outside and is removed to make the exposure.

Best,

Doremus

Don_ih · Jul 31, 2023

Doremus Scudder said:
The septum in a film holder is the central piece that the film slides into. It is built into the holder. The dark slide slides in from the outside and is removed to make the exposure.

You mean the septum is the divider between the two sides of the film holder. So, the film rests against it. A plate holder can also have a septum and a film sheath could clip into either side and rest against it.

Or that's what I take from the meaning of "septum" (partition).

eli griggs · Jul 31, 2023

Doremus Scudder said:
Just for clarity: The septum in a film holder is the central piece that the film slides into. It is built into the holder. The dark slide slides in from the outside and is removed to make the exposure.

Best,

Doremus

Cheers and, thank you for clearing that up for us.

eli griggs · Jul 31, 2023

With regard to thickness of the missing dark slide, the sister I have is approximately 1mm thick so, 20 gage should fit well enough.

Doremus Scudder · Aug 3, 2023

Don_ih said:
You mean the septum is the divider between the two sides of the film holder. So, the film rests against it. A plate holder can also have a septum and a film sheath could clip into either side and rest against it.

Or that's what I take from the meaning of "septum" (partition).

Yes, indeed. It's the partition function that makes a septum a septum. I was simply thinking of sheet-film holders where the septum also has the raised rails to hold the film and was not being as precise as I should have.

Best,

Doremus

Don_ih · Aug 3, 2023

Doremus Scudder said:
Yes, indeed. It's the partition function that makes a septum a septum. I was simply thinking of sheet-film holders where the septum also has the raised rails to hold the film and was not being as precise as I should have.

Best,

Doremus

I was only being a twit, you should've ignored me

Replacement septum material for 5"x7" holder.

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