Mistery with 4x5 negative

[lourdes_delgado]

It was one of those days. I loaded the two sheets backwards (notches on the left instead of the right upper corner). I went and I took the pictures: two pictures of the same. Come back home. Close myself in the darkromm and realize the mistake. Anyway I developed them. One negative came up ok but underexposed (I can not tell for sure if it was because of the initial mistake or because of one of those days also exposing) the other (and here the big mistery) came up like a flag: the first one third with image, the midle band totally transparent and the last third with image again. Can anybody gave me an explanation of what had happenned?

 

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Thank you very much.

 

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Lourdes Delgado

[andrew_mcphee]

Hi Lourdes,

 

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How did you develop the sheets? In a tray or a drum? Did you develop

them together or separately?

 

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Are the edges of the blank area sharp or fuzzy? Is there any detail

at all visible in the blank area?

 

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Could it have been caused by the two sheets of film sticking together

in the developer do you think?

 

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Just a thought...

Andrew

[doug_paramore]

It could possibly be uneven anti-reflection coating on the back of

the film. Just guessing without knowing a lot of the facts.

 

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Regards,

[david vickery]

Hello,

First, I would like to say that you should change the way that you

load your film holders. Every book that I have and a lot of

instructors that I've talked to say to load the holders in the way

that you are currently doing it. But if you simply turn the film

around and load with the notch code at the lower left corner you can

check the film every time you load, with your left thumb. You never

have to worry if you got the film in upside down, you can also check

the notch code later on to verify what kind of film is in the holder,

and it is easier to load-the notches don't catch on anything.

The film exposure---Ditto the uneven antihalation layer. But that

doesn't mean that there is anything wrong with the film. You should

expect underexposure when exposing through the antihalation layer.

Good luck.

[lourdes_delgado]

Hello. Thanks for trying to help me.

 

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More info (I hope it helps:

1)It was the first time that it happened to me. Normally I check and

I check and sometimes I check again that the notches are on the right

side. But it was one of those days...

 

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2)I developed them with the TBZS tubes. You put one negative for

tube.

 

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3)Are the edges of the blank area sharp or fuzzy? Sharp.

 

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4)Is there any detai at all visible in the blank area? No.

 

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Thanks again.

 

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Lourdes

[adam_friedberg]

david,

 

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the loading method you describe is the same as the book/instructor

taught method. you are just positionong the holder with the flap toward

you rather than away from you as you load.