Rollei 8OS and Foma100 Long Exposure

[karlori]

Hi,

I got my hands on some Rollei 80S and Foma 100 and 200 in 120format and would like to know how these films perform with long exposures ?
Can you provide some examples and some correction tables as I wasn't lucky in finding anything useful online.
TiA

Best Regards
Karlo

 

[Sejanus.Aelianus]

I really don't mean to be rude when I suggest that you try it yourself. Once you get to long exposures, so many things contribute to the final outcome that the best intentioned advice from others can be terribly misleading.

That said, I'm sure you realise that your biggest enemy will be reciprocity failure. Dunn and Wakefield suggest the following correction factors as a general starting point, the first figure being seconds, the second figure being the correction...

1 x 1.25
2 x 1.5
5 x 2
10 x 2.5
20 x 3
30 x 3.5
50 x 4
80 x 4.5
120 x 5

The other suggestion I'd make, is to start with Rodinal and use stand developement, say 100:1 for an hour. If you can get your hands on "Exposure Manual" (ISBN-0-85242-762X) by the above mentioned J.F.Dunn and G.L.Wakefield, you'll find much to help you.

 

[Mablo]

Reciprocity failure for Foma 100 is quite steep:

1/2s 1/2s
1 s 2 s
2 s 10 s
4 s 27 s
8 s 1 m
15 s 2 m
30 s 5 m
1 m 13 m
2 m 35 m

Foma 200 is slightly steeper:

1/2 1/2
1 s 3 s
2 s 12 s
4 s 30 s
8 s 1 m
15 s 2 m
30 s 6 m
1 m 14 m
2 m 40 m

Cannot comment on Rollei 80S but I wouldn't hold my breath it's any better.

 

[Sejanus.Aelianus]

Good grief! When you say steep, you're not kidding...

 

[karlori]

Reciprocity failure for Foma 100 is quite steep:

1/2s 1/2s
1 s 2 s
2 s 10 s
4 s 27 s
8 s 1 m
15 s 2 m
30 s 5 m
1 m 13 m
2 m 35 m

Foma 200 is slightly steeper:

1/2 1/2
1 s 3 s
2 s 12 s
4 s 30 s
8 s 1 m
15 s 2 m
30 s 6 m
1 m 14 m
2 m 40 m

Cannot comment on Rollei 80S but I wouldn't hold my breath it's any better.

Holy hell 😱 ... I might as well sit down take a canvas and start drawing what my eyes see 😱.

Thank you for your input

 

[thegman]

This is Rollei 80S:

http://www.rangefinderforum.com/photopost/showphoto.php?photo=155904

About 8 seconds of exposure. I think this film has reciprocity failure after less than a second. To be honest, I think with films like this, you can over expose by many stops, and due to the lessening sensitivity of the film, you'll get away with it.

 

[Freakscene]

I assume Mablo got those here: http://www.foma.cz/upload/foma/prilohy/f_pan_100_en.pdf
Foma calls reciprocity failure "Schwarzschild effect".

Just FYI for next time.

Marty

 

[PMCC]

Yikes. Me, I'm sticking to Acros for long exposures.