Pushing slide film correction factors?

[tomfrh]

I'm experimenting with pushing slide film at the moment to see what I can get away with.

I've tried Velvia 100 at 200 a couple of time, pushing +1.0. These come out a little dark.

I also did a roll of Provia 400X at 1600, pushing +2.0. This came out too dark, almost a stop.

I read somewhere that you need to push slide film an extra 1/3 per stop to compensate, and this would certainly match my experiences with these films above.

What are your thoughts?

Also, is pushing/pulling set out in the E6 standard?

 

[Terry Christian]

How are you pushing in your development?

 

[John Salim]

Hi Tomfrh,

Here's a list of temperature correction factors for E-6 ( Eastman Kodak ).....

+ 3 stops .... +8.9C
+ 2 2/3 ....... +8.3C
+ 2 1/2 ....... +7.7C
+ 2 1/3 ....... +7.1C

+ 2 stops .... +6.7C
+ 1 2/3 ....... +6.1C
+ 1 1/2 ....... +5.5C
+ 1 1/3 ....... +5.0C

+1 stop ....... +4.4C
+ 2/3 .......... +3.2C
+ 1/2 .......... +2.1C
+ 1/3 .......... +1.0C

Normal ........ 0.0C 'operating temperature reference'

- 1/3 .......... -0.8C
- 1/2 .......... -1.7C
- 2/3 .......... -2.5C

- 1 stop ...... -3.3C
- 1 1/3 ....... -4.3C
- 1 1/2 ....... -5.2C
- 1 2/3 ....... -6.3C

- 2 stops .... -7.2C


Hope that helps,

John S

 

[tomfrh]

How are you pushing in your development?

Writing +1, +2 etc on the roll before I give it to the lab guy. I don't know what happens after that.

 

[tomfrh]

Hi Tomfrh,

Here's a list of temperature correction factors for E-6 ( Eastman Kodak ).....

+ 3 stops .... +8.9C
+ 2 2/3 ....... +8.3C
+ 2 1/2 ....... +7.7C
+ 2 1/3 ....... +7.1C

+ 2 stops .... +6.7C
+ 1 2/3 ....... +6.1C
+ 1 1/2 ....... +5.5C
+ 1 1/3 ....... +5.0C

+1 stop ....... +4.4C
+ 2/3 .......... +3.2C
+ 1/2 .......... +2.1C
+ 1/3 .......... +1.0C

Normal ........ 0.0C 'operating temperature reference'

- 1/3 .......... -0.8C
- 1/2 .......... -1.7C
- 2/3 .......... -2.5C

- 1 stop ...... -3.3C
- 1 1/3 ....... -4.3C
- 1 1/2 ....... -5.2C
- 1 2/3 ....... -6.3C

- 2 stops .... -7.2C


Hope that helps,

John S

I'm confused now - I thought pushing pulling involved developing for longer/shorter times. Do you change the temperature change too?

 

[Terry Christian]

I was just about to say: if your lab guy is going by standard developing time and temperature and isn't doing anything differently, then the film is effectively only underexposed.

 

[John Salim]

Forgive me tomfrh, I'm not sure if you're processing E-6 films yourself or not.

If you're not but sending film to labs, you MUST write on each roll of film for pushing or pulling the amount required ( and tell them ).
The lab will then process those rolls separately from 'normal' films ( which is why most charge for pushing / pulling ).

If you're processing E-6 yourself, then you adjust the 1st developer time or the 1st developer temperature - not both. No other chemical step is adjusted, only the 1st developer.

Hope that's a bit clearer ?
John S

 

[tomfrh]

Forgive me tomfrh, I'm not sure if you're processing E-6 films yourself or not. If you're not but sending film to labs, you MUST write on each roll of film for pushing or pulling the amount required ( and tell them ). The lab will then process those rolls separately from 'normal' films ( which is why most charge for pushing / pulling ). If you're processing E-6 yourself, then you adjust the 1st developer time or the 1st developer temperature - not both. No other chemical step is adjusted, only the 1st developer. Hope that's a bit clearer ? John S

Thanks John. I'm not doing it myself (I'm still new to slide film!). I give it to a lab.

I'm giving clear instructions to the lab, they're acknowledging those instructions, and the invoice always comes back marked with RVP100 +1.0, etc. (This lab doesn't charge extra for it though)

Do you know if labs push/pull inconsistently or omit it at times? I can imagine if I was a lab guy and it was the end of the day that specially marked roll might not get the treatment it necessarily deserves...

 

[John Salim]

OK tomfrh, if you give film to a lab that offers push / pull processing but can't be bothered to take notice of your instructions - walk away !
Pushed or pulled films have to be processed properly, so there's no excuse in processing them incorrectly.

John S

 

[tomfrh]

OK tomfrh, if you give film to a lab that offers push / pull processing but can't be bothered to take notice of your instructions - walk away !
Pushed or pulled films have to be processed properly, so there's no excuse in processing them incorrectly.

John S

I don't think they're ignoring my instructions, as the slides don't look like they were processed normally, however I don't feel they're pushed enough, Hence my original query about people recommending to push an extra 1/3 for every stop as a correction factor.

 

[ME Super]

Provia 100F pushed 1 stop can be shot at 200. If you're pushing it two stops, shoot it at 320. That's been my experience.