How many "films" is a 4x5?

PerTulip · Jan 31, 2022

Hi!

I mixed some fixer yesterday. It says "for 10 films per liter". Ok, easy enough for 135. Do I stick to that with 120?

The trouble I am having wrapping my head around: what if developing 4x5? How many "films" if I develop 2,4 or 6 sheets of 4x5?

I have never run into issues, maybe because I am being to careful....if the fixer sits around for some weeks, I set up a new one. But days are getting longer (slightly), so more photos will happen....

What`s your rule of thumb for fixer (I use Adofix Plus)?

Don_ih · Jan 31, 2022

4x5 sheet is roughly 1/4 of 36 exposure 135 roll.
1 roll 120 is 1 roll of 36 exposure 135.

Vaughn · Jan 31, 2022

A roll of 36 exp 35mm, a roll of 120 film and an 8x10 are all close enough in area to call the same...which is what Don is coming up with above (four 4x5s = one 8x10).

After that it gets screwy and better to go by square inches (or sq cm).
Two 5x7s = 70 sq inches as opposed to 80 for an 8x10.
11x14 is 154 sq inches which is pretty close to two 8x10s.

Edit to add:
I try to keep track of the number of films thru the fixer, but usually have to resort to HypoChek to make sure I don't stretch the fixer too far.

wiltw · Jan 31, 2022

Vaughn said:
A roll of 36 exp 35mm, a roll of 120 film and an 8x10 are all close enough in area to call the same...which is what Don is coming up with above (four 4x5s = one 8x10).

After that it gets screwy and better to go by square inches (or sq cm).
Two 5x7s = 70 sq inches as opposed to 80 for an 8x10.
11x14 is 154 sq inches which is pretty close to two 8x10s.

^^^

Kodak would state that most of its Fixer solutions would do 100 sheets of 8x10 per gallon.
And per Kodak, 1 roll 135-36 = 1 roll 120 = one 8x10 sheet

Sirius Glass · Jan 31, 2022

four 4"x5" sheet is equivalent to 80 square inches or one roll. Not to hard 4x5 = 20 square inches and 20*4 = 80 square inches. This is not hard. I does not require higher math or even Algebra.

In post #4 5"x7" = 70 square inches ~ 80 square inches ==> 1 roll

8"x10" = 80 square inches ==> 1 roll

Isn't science wonderful!

Don_ih · Jan 31, 2022

Sirius Glass said:
In post #4 5"x7" = 70 square inches ~ 80 square inches ==> 1 roll

That'd be 2 5x7 sheets.
Just because I feel you will appreciate the correction

gone · Jan 31, 2022

I just do clip tests. The stuff lasts a lot longer than I thought it would, which is good, because the developers I have don't.

Sirius Glass · Jan 31, 2022

Don Heisz said:
That'd be 2 5x7 sheets.
Just because I feel you will appreciate the correction

I was half way there.

Donald Qualls · Feb 1, 2022

Sirius Glass said:
I was half way there.

Nah, you'd gone the extra mile, twice what was intended...

Sirius Glass · Feb 1, 2022

Sirius Glass said:
I was half way there.

Donald Qualls said:
Nah, you'd gone the extra mile, twice what was intended...

It was one of those annoying "off by one" software error.

wiltw · Feb 1, 2022

Sirius Glass said:
It was one of those annoying "off by one" software error.

Or the loose nut on the calculator that needed tightening

Sirius Glass · Feb 1, 2022

wiltw said:
Or the loose nut on the calculator that needed tightening

I keep my loose nuts low.

PerTulip · Feb 6, 2022

Don Heisz said:
4x5 sheet is roughly 1/4 of 36 exposure 135 roll.
1 roll 120 is 1 roll of 36 exposure 135.

Thanks!

That's easy enough to keep track of. 1 135=1 120=1/4 4x5.

abruzzi · Feb 6, 2022

PerTulip said:
Thanks!

That's easy enough to keep track of. 1 135=1 120=1/4 4x5.

While I'm sure you understand it, I think you have it backwards in the formula, i.e 1x(135)=1x(120)=4x(4x5)

PerTulip · Feb 7, 2022

abruzzi said:
While I'm sure you understand it, I think you have it backwards in the formula, i.e 1x(135)=1x(120)=4x(4x5)

In my head it was correct. :-D

Alan Edward Klein · Feb 7, 2022

When you do a contact sheet of 35mm film of 36 exposures, you use one 8x10 sheet..

summicron1 · Feb 7, 2022

i've never kept count -- with any film I just let it fix for 5 minutes and take a look-- there's no danger of fogging at that point and if it hasn't cleared yet -- still looking milky -- I know the fixer is close to being dead.

RalphLambrecht · Feb 7, 2022

PerTulip said:
Hi!

I mixed some fixer yesterday. It says "for 10 films per liter". Ok, easy enough for 135. Do I stick to that with 120?
the surface area of a roll of 35mm and 120 roll film are both about 8x10 inches, which is roughly equivalent to four 4x5 sheets.
The trouble I am having wrapping my head around: what if developing 4x5? How many "films" if I develop 2,4 or 6 sheets of 4x5?

I have never run into issues, maybe because I am being to careful....if the fixer sits around for some weeks, I set up a new one. But days are getting longer (slightly), so more photos will happen....

What`s your rule of thumb for fixer (I use Adofix Plus)?

Sirius Glass · Feb 7, 2022

abruzzi said:
While I'm sure you understand it, I think you have it backwards in the formula, i.e 1x(135)=1x(120)=4x(4x5)

1x(135)=1x(120)=4x(4x5)~=2x(5x7)

How many "films" is a 4x5?

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