Stock strength D23 + HP5 @ 200

Xícara · Jun 28, 2024

Hello, I'm about to mix up some D-23. I have a roll of HP5 Plus 400 exposed at ISO 200 (I had originally planned to develop it in PMK) that I'd like to try with D23 at stock strength. There is no time/temperature data on the Massive Dev Chart for this combination. Has anyone developed HP5 @ 200 with full-strength D23? If so, please send suggestions.
Thanks!

Alex Benjamin · Jun 28, 2024

Xícara said:
Hello, I'm about to mix up some D-23. I have a roll of HP5 Plus 400 exposed at ISO 200 (I had originally planned to develop it in PMK) that I'd like to try with D23 at stock strength. There is no time/temperature data on the Massive Dev Chart for this combination. Has anyone developed HP5 @ 200 with full-strength D23? If so, please send suggestions.
Thanks!

Because of the slight loss of speed of D-23 compared to D-76, my starting point for this developer is to add 15% or 20% development time to the D-76 times. Simple math is to multiply the times by either 1.15 or 1.2. For example, I get good results with HP5+ at 9:00, with a D-76 time listed at 7:30, in D-23 replenished.

Of course, it all depends on the contrast level of the scene, and how much you like (or trust) the recommended times for D-76. But, as I said, adding 15% is a good starting point. That said, remember that you already lose some contrast by shooting at ISO 200, so, depending on your taste, you may need to compensate for that by agitation. D-23 is not a high-contrast developer.

Xícara · Jun 28, 2024

Alex Benjamin said:
Because of the slight loss of speed of D-23 compared to D-76, my starting point for this developer is to add 15% or 20% development time to the D-76 times. Simple math is to multiply the times by either 1.15 or 1.2. For example, I get good results with HP5+ at 9:00, with a D-76 time listed at 7:30, in D-23 replenished.

Of course, it all depends on the contrast level of the scene, and how much you like (or trust) the recommended times for D-76. But, as I said, adding 15% is a good starting point. That said, remember that you already lose some contrast by shooting at ISO 200, so, depending on your taste, you may need to compensate for that by agitation. D-23 is not a high-contrast developer.

That's great. Thanks a lot for the information.

RudyMerz · Jun 28, 2024

Xícara said:
Hello, I'm about to mix up some D-23. I have a roll of HP5 Plus 400 exposed at ISO 200 (I had originally planned to develop it in PMK) that I'd like to try with D23 at stock strength. There is no time/temperature data on the Massive Dev Chart for this combination. Has anyone developed HP5 @ 200 with full-strength D23? If so, please send suggestions.
Thanks!

Just as an example. The attached photo was photographed with my Sinar F2 and the 150mm Nikon on 4x5 HP5+ @ ISO 200, f/22, 1/15s and a red25 filter. I developed it in D23 Replenished at 20C for 7:30 minutes.

Xícara · Jun 28, 2024

RudyMerz said:
Just as an example. The attached photo was photographed with my Sinar F2 and the 150mm Nikon on 4x5 HP5+ @ ISO 200, f/22, 1/15s and a red25 filter. I developed it in D23 Replenished at 20C for 7:30 minutes.

Fine photo! A bit less than 15% more time, when compared with the Massive Dev Charts listing for D76 @ 20°C, but close! Does replenished D-23 need any change in times? I'll be a first time user with fresh D-23 (mixed today) when I finish this roll of film.

Alex Benjamin · Jun 28, 2024

RudyMerz said:
Just as an example. The attached photo was photographed with my Sinar F2 and the 150mm Nikon on 4x5 HP5+ @ ISO 200, f/22, 1/15s and a red25 filter. I developed it in D23 Replenished at 20C for 7:30 minutes.

Beatiful, Rudy!

Xícara said:
Fine photo! A bit less than 15% more time, when compared with the Massive Dev Charts listing for D76 @ 20°C, but close! Does replenished D-23 need any change in times? I'll be a first time user with fresh D-23 (mixed today) when I finish this roll of film.

Yes, he's around 10%. Anything between 10% and 15% is a good start.

For D-23 replenished, I believe John Finch suggests adding another 10% to your regular D-23 times, but I haven't found that necessary.

RudyMerz · Jun 28, 2024

Xícara said:
Fine photo! A bit less than 15% more time, when compared with the Massive Dev Charts listing for D76 @ 20°C, but close! Does replenished D-23 need any change in times? I'll be a first time user with fresh D-23 (mixed today) when I finish this roll of film.

Thank you, Xícara.

I watched John Finch how he made D23 replenished.

Here is a link : D23 - Replenished. How to make and use D23 replenisher.

He also has a video in which he shows how you make your own sodium metaborate, just in case you have a hard time in your country to get a hold of it.

Making Your Own Sodium Metaborate

And the following video helped me a lot to create my own times, with the film,developer and equipment I am using.

EZ Zone System Part 1 - Quick and Easy Film Speed Tests

Just check it out, it is well worth it.

Best,
Rudy

RudyMerz · Jun 28, 2024

Alex Benjamin said:
Beatiful, Rudy!

Thank you, Alex.

Best,
Rudy

Xícara · Jun 28, 2024

Thanks @RudyMerz . Yes I've watched two of John Finch's vídeos on the subject. Will be mixing up the replenisher tomorrow by first making the sodium metaborate solution in vídeo/link you sent. Will check the zone system link. All the best,
Iain

ags2mikon · Jan 30, 2025

Great image Rudy. Is that North East of Roswell?

Stock strength D23 + HP5 @ 200

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