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In search of a good use of Kentmere 400… (Sharing a development recipe)

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Juan Valdenebro

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Dear APUG members,

I’d like to share a recipe I’ve found (and really like) after a few weeks of testing, so here’s the story for those who have some minutes now for a post that’s not too short, and perhaps some more minutes in the future for a development that’s not too short either…

For those who have K400 & Rodinal at hand and just want to shoot and develop without reading any further, this is it: K400@800, Rodinal 1:50, 62°F (close to 17°C), 40 minutes, 4 slow inversions in the beginning, 4 slow inversions every tenth minute (so, at minutes 10, 20 & 30).

I’ve worked on this for a 35mm (format) lens: a 50mm one for f/2 shooting… The lens’ contrast is not too low nor too high, so for lenses being too soft or too contrasty, just increase or decrease a bit development time, and it’ll work perfectly fine for wet printing and scanning.

A few hows and whys for avid readers:

For precise metering I compared two cameras and a Sekonic incident meter (used for both incident and spot reflected light metering), and every time during this past month of testing K400 I wrote down notes for all types of common natural light: soft overcast light, direct sun, shades on a sunny day, and very low natural light indoors and outdoors.

Apart from real scenes, I also had a usual, constant, set scene: a double-page sized grays card -on a rigid support- I had digitally printed on matte paper. It goes from pure black to pure white, 11 strips in total, so 9 different grays, being the third darkest gray (strip #4) Kodak’s gray card’s tone exactly. Instead of being horizontal as the 11 strips, to the right there’s a stuck vertical strip: a real fragment of a Kodak’s gray card. This big grays card was my most used scene and main subject for calibration, but it was not what I metered: for metering I used a poster-size single gray tone matching Kodak’s gray card tone, made of four identical digital prints stuck on a rigid base too. I made it because in camera metering can sometimes be uncomfortable with wide lenses, as Kodak’s cards are smaller than they could be, so the poster is a lot easier to use: I just put it for an instant covering any scene, meter, and then take it away and shoot the scene… Very fast, accurate and reliable, as light seldom changes in a few seconds.

I write all data and comments on the scenes after shooting, not after metering, to work quickly and avoid light changes… I prefer not to meter my gray stripes big card because it’s not an absolute but indeed a variable contrast scene depending on the intensity of light… The middle gray poster is better for metering.

Caring about best possible exposure is underrated, but it’s as great for B&W as it is for slide film… Some people might consider it unnecessary for box speed shooting and for a bit more exposure than that, cases that require normal and short development times, and produce, in general, normal and low contrast negatives, and some other people feel it’s unnecessary also because of the increasing number of people taking a totally new, autoexposure, digital photograph of a negative (scanning), which can produce a somehow decent virtual image from a horrible negative: a digital image that can also be tweaked a lot in post…

I’m used to work the old way and carefully calibrate every new film I use (exposure & development) because I push most of my film (prefocused street at f/11 with a Double-Gauss 35, HP5+ @1600 in Microphen stock), so at 1600 and 3200, a stop or half a stop of underexposure means easily ruining a negative for wet printing (sometimes you can’t avoid a face is not receiving the best possible light), and even for the best materials I have tried for pushing (HP5+ and D3200 in Microphen stock), exposure precision is not a luxury, but a basic requirement for best tone, both for wet printing and scanning.

Only a short time ago I read K400 is made by Harman, so I immediately wanted to try it… It’s a totally new emulsion, and a very recent one if we compare all that's in the market... I was trying to decide these past months which film to use permanently for f/2 shooting, with a second camera ready for selective focus anytime, so highest ASAs were not required… I also read several comments on how beautiful K400’s grain is when wet printed: a lot smaller than some digital/scanning forums comment… It makes sense, I guess, as I imagine Ilford and Harman have not taken, fortunately, Kodak’s approach, which for the last decade seems to have been basing their film’s evolution on optimizing films for scanning, basically.

My first attempts were developing K400 with the great Microphen… After three different trials @200, 400 and 800, I concluded perhaps K400 was not as planned/designed for being great with Microphen as HP5+ clearly has… Possibly because of my way of doing it (surely K400 can shine other ways in Microphen), but even while checking negatives, I didn’t feel I was getting the clear, clean tone separation I get with my usual HP5+ in Microphen: it was all a bit weak… It was noticeable right on negatives, and I felt the same with real scenes and with my gray stripes' test shots, so I thought it would be a good idea to try get some more punch with… Rodinal.

When I discovered Microphen I was amazed: it produces the same sharp grain Rodinal gives, so I loved it, but it does it without losing speed and without bumping contrast: a dream… But this time it looked like I was needing a little more contrast, and as speed and pushing were not the goals, Rodinal seemed a natural option… I’ve used Rodinal for long, for more than 20 years, in all ways: from the vulgar “20-24°C constant agitation, high contrast, big grain, I don’t believe in the Rodinal Church development”, to the real thing: low temperature (16-18°C), little agitation, semi-stand, stand, 3ml/roll, 1:100, 1:50, 1:25 for soft light… Rodinal’s tone is beautiful always, not to talk about the beauty of grain that’s not been dissolved. Indeed I find it a wonderful developer not only for fine grain/low ASA films, as it’s often said. I’ve pushed Tri-X in Rodinal more than anything in my life (I have a past) and it can be well done… Besides, another advantage anyone can test is, very little agitagion, with Rodinal, produces higher acutance, visible even in scans and small prints, and there’s no doubt about it: years ago I did tests on it twice, with two different films, and the difference is clearly visible, not a small thing…

When I thought of doing K400 in Rodinal, my main intention was trying to get great tone, believing, maybe romanticly, a new emulsion by market leading experts had to be something… But, yet there were two big, relevant questions in the air: first, could K400’s often so called huge grain, be effectively very well controlled with Rodinal?, and second, would K400, a film that’s not as famous as others, lose lots of speed in Rodinal, ending in the same group of those eastern, low cost films good for 200 ASA shooting only? Well, both questions were soon to be answered happily…

Knowing Rodinal as a speed losing developer, and it is most of the times, I started testing K400 in it @200… It didn’t require that much light… Then @250… The same… Then @320… Must be film´s design is outstanding, but with all those lower than box speeds, and finally even @400, my grays card and even Kodak’s gray card were recorded in negative a bit lighter than they are, and that’s a lot to say… I find the film works great @400 even in Rodinal, at least with this development scheme, developing it for 30 minutes… Then I thought, with such clear dark grays, why not?, and went for @800, but with doubts, obviously… In the end, I settled in, because I prefer that tone better, doing K400@800 for 40 minutes… It’s a really mild push tone, very close to normal… @400 for 30 minutes is fine too, but a bit weak for common overcast light…

About temperature:

Rodinal grows grain when used at other developers’ usual temperature of 20-24°C… At 18°C and a bit below that, it behaves differently. I used 16°C for some years, but times are too long… This time I decided testing from the beginning at 62°F (close to 17°C), to keep grain beautiful and reduce times a bit. Only for low temperature with Rodinal I presoak, because my house’s temperature is 23°C, so I do a 2 minute presoak with water at 62°F: I use part of the bowl’s water at 62°F I put the tank in while developing, and after those 2 minutes everything in the tank is cold enough, then I pour back the water in the bowl and immediately pour the developer (at 62°F) in, with four initial slow inversions. This way grain growing is very slow from the beginning… Then every few minutes I check with my thermometer and if water temperature tries to start going up from 62°F, I place an ice inside the bowl’s water and move it slowly for some seconds to keep the water at 62°F. During winter, I use some drops of hot water instead of ice.

About agitation:

Low temperature from the very start, mixed with very little agitation, are the two things that matter here and give this Rodinal look that for some people, won’t look like Rodinal @800. After the initial agitation (four slow inversions), during the whole 40 minutes of development, only 3 different times the developer moves, every tenth minute (the same four slow inversions): this is a semi-stand, a safer way of developing than a stand, and yet it helps a lot for acutance/perceived sharpness, and also for small grain and highlights control.

This development produces a gray card on negative you can read a newspaper’s article through, as old times’ photographers and printers used to say… Reality’s pure whites are very well controlled on negative too (they make a darkish gray, but far from the darkest grays the film can produce), so contrast is nice for wet printing, and there’s yet plenty of latitude left on film for good recording of direct sun scenes in the same roll, and also for overexposure mistakes up to a stop without losing highlights detail… All film’s range is well used: blacks are recorded deep black, instead of medium to dark grays, so common while scanning… (Scans look basically ready without tweaking).

Grain is sharp and very tight, and it’s not big at all for a 400 ASA film. I’d call it small for 800… Grain structure is unobtrusive: dark, medium and light grays’ grain look pleasant, all around… Sorry if someone’s ways or equipment are slightly different: for sure with little time adjustment everything will work fine. This film’s a great one in my opinion!

Happy shooting, and Merry Christmas everybody!

J.
 

Ian Grant

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About temperature:

Rodinal grows grain when used at other developers’ usual temperature of 20-24°C… At 18°C and a bit below that, it behaves differently. I used 16°C for some years, but times are too long… This time I decided testing from the beginning at 62°F (close to 17°C), to keep grain beautiful and reduce times a bit. Only for low temperature with Rodinal I presoak, because my house’s temperature is 23°C, so I do a 2 minute presoak with water at 62°F: I use part of the bowl’s water at 62°F I put the tank in while developing, and after those 2 minutes everything in the tank is cold enough, then I pour back the water in the bowl and immediately pour the developer (at 62°F) in, with four initial slow inversions. This way grain growing is very slow from the beginning… Then every few minutes I check with my thermometer and if water temperature tries to start going up from 62°F, I place an ice inside the bowl’s water and move it slowly for some seconds to keep the water at 62°F. During winter, I use some drops of hot water instead of ice.

Completely untrue, grain in itself is not affected by developer temperature, I used Rodinal for about 20 years with exceptional high quality at 20º to 22º C, there's no need to use lower than 20ºC.

The issue is tight temperature control throughout the process cycle because Rodinal contains free Hydroxide which can soften some emulsions leading to surface artifacts on the gelatin super coat, this gives increased apparent graininess when printing or scanning but is due to a combination of the normal film grain and the surface artifacts - sometimes called incipient or micro reticulation.

The reason German workers use(d) Rodinal at lw temperatures goes back to before WWII when films were quite poorly hardened compared to most of today's films, the emulsion swells less at lower temperatures so less chance of surface issues.

I use developers at up to 27ºC when in Turkey and there's no differences in Grain/Graininess at 20ºC or 27ºC.

Ian
 

Gerald C Koch

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Hopefully Ian has quashed another myth in the making. :smile:
 

pdeeh

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the claim that low temperature Rodinal gives fine grain has been propagated by a couple of people on apug for years now.
 
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Juan Valdenebro

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Completely untrue, grain in itself is not affected by developer temperature, I used Rodinal for about 20 years with exceptional high quality at 20º to 22º C, there's no need to use lower than 20ºC.

The issue is tight temperature control throughout the process cycle because Rodinal contains free Hydroxide which can soften some emulsions leading to surface artifacts on the gelatin super coat, this gives increased apparent graininess when printing or scanning but is due to a combination of the normal film grain and the surface artifacts - sometimes called incipient or micro reticulation.

The reason German workers use(d) Rodinal at lw temperatures goes back to before WWII when films were quite poorly hardened compared to most of today's films, the emulsion swells less at lower temperatures so less chance of surface issues.

I use developers at up to 27ºC when in Turkey and there's no differences in Grain/Graininess at 20ºC or 27ºC.

Ian

Hi Ian,

I see no difference in developer temperature, talking about grain, with most developers, and there I include the developer I use the most, Microphen... I use it at 24°C since I did tests and saw no difference comparing 20 to 22 and 24...
You say Rodinal gives great quality at 20 and 22°C: I said that too... Even at 1:25.. Great tonal quality...
Yet I think using it at 24°C without presoaking, offers different grain than using it at 16.6°C with same temperature presoak...
For a project long ago, for huge grain, I used it at 30°C... Indeed, huge grain!
Myth or no myth, anyone can test it, that's the best part, instead of considering any online opinion, the only truth...
I sincerely doubt this tone and grain can be obtained with Rodinal & K400@800, at higher temperature...
Thanks for the kind information!
J.
 

pentaxuser

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I must admit that I get concerned when it appears that the grain is sharp and tight at 62F but quite rigorous steps need to be taken to stop it even rising to 63F which is the ambient temperature surrounding the process. It is as if 1 degree F represents the difference between sharp, tight grain and if not disaster then considerable loss.

I'd like to see evidence of grain difference between two negs exposed in the same light, one of which is processed at 62F and the other of which is processed at say the usual 68F using this semi-stand process.

pentaxuser
 

Craig75

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Given that Henry showed that temperature and grain are it seems pretty weak that people are on Juan's back after he's kindly shared his experiences
 

Gerald C Koch

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I have always thought that when 18C was quoted as a development temperature that it was the ambient temperature of darkrooms at the time in northern Europe. BBRRR!
 

Gerald C Koch

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Given that Henry showed that temperature and grain are it seems pretty weak that people are on Juan's back after he's kindly shared his experiences

The problem with grain is that you cannot measure it by eye. The human mind sees what it wants to see. Therefore film manufacturers like Kodak measure what is known as the Root Mean Square (RMS) Granularity. Kodak publishes these values for its film. The equipment required to do this is beyond most people's budget.

In addition Microphen (also Perceptol, Microdol, ...) are high sulfite developers which do quite a bit to reduce the inherent grain of a film. You would really need a non-solvent developer to make any comparisons as to the effect of temperature. Of the readily available developers Xtol probably produces the finest grain. I take as my authority Dick Dickerson and Silvia Zawadski who derived the formula.
 
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pentaxuser

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The problem with grain is that you cannot measure it by eye. The human mind sees what it wants to see. Therefore film manufacturers like Kodak measure what is known as the Root Mean Square (RMS) Granularity. Kodak publishes these values for its film. The equipment required to do this is beyond most people's budget.

In addition both Microphen and Perceptol are high sulfite developers which do quite a bit to reduce the inherent grain of a film. You would really need a non-solvent developer to make any comparisons as to the effect of temperature.

The following are questions not challenges. I take it from your quote that anything "special" about the grain properties of applying Rodinal at a temp of 62F to film is purely "in the eye of the beholder?

Is this a correct conclusion?

If Kodak publishes RMS granularity for films but Microphen and Perceptol do quite a bit to reduce inherent grain then is there such a thing as inherent grain as it would appear that different developers do affect grain. So is RMS for a film dependent on the developer and based on a specific developer in the same way that the ISO of a film is arrived at from development in a specific developer such as D76?

Finally where does Rodinal sit on this grain reducing scale and why is it that Rodinal grain is affected by temperature change but other developers are not?

Thanks

pentaxuser
 

flavio81

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If Kodak publishes RMS granularity for films but Microphen and Perceptol do quite a bit to reduce inherent grain then is there such a thing as inherent grain as it would appear that different developers do affect grain. So is RMS for a film dependent on the developer and based on a specific developer in the same way that the ISO of a film is arrived at from development in a specific developer such as D76?

Hi user of Asahi Optical products,

There is an inherent grain to a film, assuming you are developing to a specific gamma or contrast (developing to more contrast will perhaps increase grain). All else being similar, a 400 speed film will have on average larger crystals than a 100 speed film (in reality, such films contain several layers of emulsion, for example a slow speed layer with finer grains, a high speed layer with coarser grains, etc.)

But there are developers that can reduce grain, for example by using a silver solvent such as Sodium sulphite (Microdol-X, Perceptol).
D76, a "standard" developer, also has sodium sulfite, but in lesser content. D76 was also known as a "fine grain" developer.
And, for example, if you develop D76 using in an 1:1 dilution, instead of straight, the sulphite content is lower, so grain is reduced less.

So when these RMS measurements are done, usually the developer is specified, because it will impact the results.
 

Ian Grant

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Gerald is correct that many books and some companies recommended 18ºC or 65ºF but this was for all developers and more about ambient temperatures and swelling of the emulsions,

Comparing Rodinal to Xtol, I used both alongside each other for nearly 20 years and with APX100 & APX25 and also Tmax 100 there is no detectable differences in grain size between the same film used in either developer. I can't comment about other films as I never processed them in Rodinal.

I disagree with Juan that increasing developer temperature on its own causes an increase in grain, however I agree that temperature can cause excessive graininess but this is linked to poor temperature control throughout the cycle rather than the chosen temperature itself.

Ian
 

mnemosyne

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First, a big thank you to Juan for sharing his findings here with us (and sorry I have not yet posted the promised toning sample from the other thread...). Concerning the dispute about the alleged merits of using Rodinal below room temperature, Uwe Pilz, fellow APUGer, is a proponent of the so called "cold development" ("Kaltenwicklung") and has also published a short paper in German about this method. I guess he is also the inspiration behind Juan's experiments with K400 and cold Rodinal. Maybe if Uwe could chime in comment on the theoretical foundation of this method and maybe even share some examples, this could lead the whole discussion onto firmer grounds?
 

piu58

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Dear photographers,

I use(d) K400 and Rodinal with good result: Good tonal range and amazing small grain. I recommend that combination. My experiences came from "Kaltentwicklung", means Rodinal with 16 dec Celsius.

It is sufficient for you to use google translator for my text? If some of you are interested I write an English version.
 

Ian Grant

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Reading that German PDF even with a Google translation there's nothing new that would make me change my approach if I used Rodinal again. About the only thing I agree with is concentration is the best way of altering contrast. I can't see anything about why 16ºC is any better and my own experience and that of many others is 20ºC to 22ºC or even24ºC gives excellent fine grain and no increase in graininess.

Ian
 

Harry Stevens

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All I need to know about Rodinal is 1+50, 20c, gentle agitation.........Can't remember ever being over concerned about grain on any photograph.:smile:
 

pentaxuser

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These posts have certainly helped with my understanding and helped me form my own conclusions. They may not necessarily be the OP's conclusions but the posts have been educational and that is often all anyone can ask for on a forum

Thanks

pentaxuser
 

rpavich

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All I need to know about Rodinal is 1+50, 20c, gentle agitation.........Can't remember ever being over concerned about grain on any photograph.:smile:
I just loaded a daylight loader with 100' of k400 and think it's time to pull out the Rodinal again just to see if my results can be like this.
 

Trask

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I was pleased to read Juan's report -- and I am entirely willing to try it myself and see what's what.
 
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