Developing times for D76,; different films and processes

[Jim Benson]

Different sources give different developing times for the films, developer, and methods that I am using, so I thought I’d check in here for advice.

I am currently using D76 mixed 1:1, 4 x 5 sheet film, and tray developing with constant shuffling.

I’m using some TMax 400 because I needed film in a hurry, and that’s what the store had, but usually I use TXP 320. I shoot both as rated

I plan on switching to using tank development with hanging sheet holders with constant agitation for the 1st minute and 5 seconds agitation each 30 seconds thereafter. The switch is primarily due to scratches showing up on negatives ( I didn’t have thatwhen I worked with this film 3 years ago)

Anyway, what would people recommend for times for these methods with that developer, and those films?

Also, when you change developing time due to a temperature change, does that affect contrast, or is everything the same in every respect.

I'm just looking for a starting point at this time

Thank you for your help.


Jim Benson

 

[Pioneer]

You can never go wrong by starting with the manufacturer's recommendation.

Go here: http://www.kodak.com/global/en/professional/support/techPubs/f4016/f4016.pdf

Use recommendations on Page 7. Use D76 straight, not 1+1. You can re use and replenish. 1+1 is best reserved for daylight tanks in one-shot situations.

 

[Xmas]

Ilford have data Sheets for ID-11 as well.

 

[markbarendt]

Yep, as pioneer says start with the kodak recommendations, season to taste from there.

 

[Xmas]

Also, when you change developing time due to a temperature change, does that affect contrast, or is everything the same in every respect.

Jim Benson

You change time to keep the contrast sensibly the same but toe speed, fog, shoulder,... won't necessarily be the same for large temperature differences if you were to use a densitometer.

 

[cliveh]

You change time to keep the contrast sensibly the same but toe speed, fog, shoulder,... won't necessarily be the same for large temperature differences if you were to use a densitometer.

How will using a densitometer change the toe speed, fog and shoulder?

 

[Bill Burk]

13 minutes 30 seconds.

 

[Bill Burk]

I am currently using D76 mixed 1:1, 4 x 5 sheet film, and tray developing with constant shuffling.

I’m using some TMax 400 .... I shoot ... as rated

Very often I recuse myself from giving specific advice "because it's not exactly what I do"... But this is different, I can help.


The reason I am able to quote you a time is that I use that process and procedure (at 68-degrees F) and 13 minutes 30 seconds is consistently the time for me to develop to 0.62 Contrast Index (ASA parameters) and at that time I expect rated speed.

A densitometer, if you have it, would help you evaluate any tests you might perform and then you can confirm the contrast that you actually get.

I tend to process as close to 68-degrees F as I can. Adjusting time for temperature changes should give you exact same contrast as using the original time and temperature, unless you go wild with temperature changes (and develop at 90-degrees F for example), then I don't have any idea - you'll probably mess things up for complex chemical reasons.

 

[RedSun]

I have two copies of Kodak BW darkroom Databooks. So much info about D-76...

 

[Xmas]

Very often I recuse myself from giving specific advice "because it's not exactly what I do"... But this is different,

A densitometer, if you have it, would help you evaluate any tests you might perform and then you can confirm the contrast that you actually get.

Thanks Bill

 

[Xmas]

Very often I recuse myself from giving specific advice "because it's not exactly what I do"... But this is different, I can help.

...

I tend to process as close to 68-degrees F as I can. Adjusting time for temperature changes should give you exact same @contrast as using the original time and temperature, unless you go wild with temperature changes (and develop at 90-degrees F for example), then I don't have any idea - you'll probably mess things up for complex chemical reasons.

At 90F Id suggest a specilised tropical process is desirable the H&D curve fog toe speed all different...

 

[Bill Burk]

Gerald Koch pointed out in another thread that it is important to state: The time (13 minutes and 30 seconds) is only a suggested starting point.

Because I use tray processing and D-76 1:1, for which there isn't a published time, I hope that my time, is a helpful suggested starting point.

As you continue to try to improve your developing, if you stay with D-76 1:1 I may be able to offer further assistance because I have relevant experience.