Umkehrentwicklung Fotopapier

nach Rüdiger Hartungs Mitteilung in „facebook“


1 Papierentwickler normal bis etwas höher verdünnt (für schwache Kontraste)
2. Rotes Blutlaugensalz 40 Gramm pro Liter an.
3. Klärbad 90g Natriumsulfit in einem Liter Wasser.
4. Ein Blitzgerät zur Nachbelichtung (oder Lampe)

  1. Fotopapier mit dem Dia 2 bis 3 Blenden überbelichten. Falls das Endergebniss (Positiv) noch zu dunkel ist, noch mehr überbelichten.

2. Erstwicklung. Ausentwickeln. Es entsteht zunächst ein Negativ. Wegen der Überbelichtung ist dies sehr dunkel.
– kurz in Wasser abspülen –

3. Bleichbad. Mindestens 2 Minuten. Es bleibt ein Restbild stehen. Wenn sich absolut nichts mehr tut,
-kurz mit Wasser abspülen-

4. Klärbad. Auch mindestens 2 Minuten. Zum Ende hin wird das Restbild etwas flacher, milchiger.
– in Wasser mit Bild nach oben legen-

5. Nachbelichten. Blitz mit kleinster Leistungstufe und ca 1m Abstand.

(Variante : Wer eine Schwefel/Sephiatonung macht, kann sich die Nachbelichtung und Zweitentwicklung sparen, das erledigt der Schwefeltoner zusammen).

5. Zweitentwicklung im selben Entwickler (wer die etwas besser steuern möchte, kann 1+1 verdünnen).

5. Fixieren, wässern.

Bei Licht Ergebnis beurteilen.

Finetuning.
Falls das Positiv zu hart oder zu dicht ist:
(Das Bild muss sehr gut gewässert sein nach dem Fixieren. Fixierreste plus Bleiche frisst Lichter unwiederbringlich weg!)

Nochmals bei Licht in die Bleiche (ggf. stärker verdünnen 1+5) und so lange bleichen, bis die Schatten so sind, wie man sie haben möchte und dann schnell in Wasser und bewegen. Die Lichter werden dann mit sehr stark verdünntem Erstentwickler (1+10) zurück entwickelt. Ggf. wiederholen. Dann nochmals fixieren und wässern.

Geht praktisch schneller, als es hier den Anschein hat.

Pinhole – macro

I am thinking of doing some pinhole macro work.

Looking the internet up I found some interesting thoughts

If you draw a ray diagram you may see a problem if you bring it very close to your subject, and your film sensitivity curve isn’t narrow.

For one thing the material in which the hole is made would need to be very thin, or you’ll get some odd vignetting.

But also remember that pinhole does a very poor job of focusing different wavelengths to the same plane. As the subject gets closer to the pinhole, that issue should get more noticeable: rays containing all the colours will need to approach the pinhole from more extreme angles.

Hence my suggestion to use a film with a narrow sensitivity curve… it’d be best if it were sensitive to a single wavelength

Seems I will have to do some tests myself

Minox 9mm Film Development

Instructions for the 8x11film- Reel for JOBO Tank System 1500

With this reel your existing 8x11mm negative and slide films can be developed using the JOBO 1500 developing tank. It is based upon the small and medium format reel for the JOBO 1500 system (DuoSet 1501) and was developed jointly by 8x11film in co-operation with Minox GmbH. This is the first genuine alternative to the original MINOX daylight developing tank that is no longer in production.

The product from JOBO have a reputation for extreme dependability and easy of loading and our transformation of the spiral does not change anything. Please read the instructions carefully to learn from our 12 months experience and testing to get the most out of this product and avoid damages to the spiral parts.

The development of an 8×11 film reel to use in the inversion tank has several advantages over the discontinued Minox daylight developing tank. 35mm and roll film can be developed with the same solution and at the same time depending on the choice of JOBO tank several reels can be loaded at the same time.

The same temperature and duration of processing follow those supplied by the manufacture of the film and of the developer. The same techniques for temperature control, inversion, tilting and processing that apply to conventional film can be followed.

With some skill and care is possible to develop two 36 exposure MINOX films on one reel. However we recommend that separate reels are used for each film to avoid the films moving and overlapping during the developing process. This is particularly a problem with films that have a strong tendency to curl. These may not be successfully developed at the out edge of the spiral.

The development in the rotation processor becomes possible with the 8×11 film spool but only with drastically lowered rotational speed. This is because the exposed area the negative strip, despite the large clearance between the adjacent parts of the spiral or helix can come into contact with it aided by the constant linear direction of flow of the developer in connection with turbulence at the outside edges of the spiral – both can lead to different velocities of flow and thus creating locally different effects of the developing chemistry. This phenomenon does not occur if the rotation is accompanied by tilting (please note however the tips for the coil of the film as well as for the movement of the tank during the process!). The use of the 8×11 film spool with the combined tilting rotation (e.g. JOBO Autolab) is under test.

Assembly: Preparing the spool for use in the JOBO tank

The spool is composed four parts, as shown in the photograph: 

Part A.: the lower reel flange with the collar for the central column to anchor the upper flange in place.Part B.: the upper reel flange Part C.: the bayonet locking collar Part D.: a plastic locking pin, which serves as fixture for the upper spiral to prevent twisting during loading and development.   

First of all set the upper reel flange (B) on the centre tube fixed to the lower reel flange (A, picture left). The position of the bayonet pins are not symmetrical and the upper reel will have to be turned to slide into place. The upper reel flange must ultimately rest on the lower reel flange.

The bayonet locking (C) is put on in the same way. It will slide on in only one way, no force is needed. The narrower slots must be downwards towards the lower reel flange. Rotate clockwise, looking down, to firmly lock into place.

(G) The bayonet locking should not be twisted up to the end of the slot. It is sufficient to turn it so that the pins are centrally placed within the slots. (G)

The illustration left shows the correctly locked reel. The openings of both flange halves are positioned to face each other accurately (illustration right).

Insert the plastic locking pin (D) into the hole in the base of the lower flange. The pin head is flat one side, this points out towards the spiral so that it lies flush when fitted. In this position it locks the upper flange. Push the reel over the centre tube, thus the head of the pin is prevented from falling out. The reel is now ready for action. 

Loading 8×11 film

(GThe JOBO developing tank is not for daylight loading, therefore all following steps up to locking the box with the transferred film must take place in absolute darkness! (G)

Remove the caps of the MINOX film cassette. These held in place by small clips. Carefully use a thumbnail to lift the caps away and pull off. If the film has not been wound through it may be easier to take both caps off.

Cut off the end of the film with the keyhole with sharp scissors and round the corners. If the corners are not rounded the film can hook itself then moving along the spiral.

Tip: Use a clean porcelain plate as a dust free container to layout all the small articles and aid in finding them by touch. Take the prepared film in the left hand and the spool in the right. Feel for the reel opening the right thumb and slowly slide the negative strip with the rounded off end into the groove. By holding the negative strip with thumb and index finger (as shown) push the film completely into the reel.

(G) It is recommended that the film be pushed completely into the reel. The fact that the reel has a narrower part tapering towards the centre exposes the edge of the film and so you can continue to hold the film along the edge and push towards the middle. Thus there are fewer pressure points on the film material with the spiral. With films of extreme coiling tendency this helps, along with small rotation and agitation of the tank to prevent under-development of the edges of the negative. (G)

Still in the dark insert the reel into the tank. Push on the lid and firmly push down the sealing and clamping ring. If done correctly the remaining steps can be done in daylight. It is advisable to practice these steps with out film in the daylight until you are confident of doing the same process in the dark with the film to be processed.

The developing of the film

You can develop your film now according to manufacturer’s instructions, (G) although we do recommend to deploy a particular motion technique of the tank (G), by which as even a washing of the film as is possible to be ensured during the process. This is necessary, since the film with the exposed negative area overlaps with the spiral of the reels and must also be well washed. In addition this helps to possibly carry away last bubbles of air stuck on the emulsion and is done in conjunction with the traditional inversion and taping of the tank.

Tilting agitation, as in holding the tank and rotating the wrist, is not sufficient. The developing tank should additionally be tilted and rotated so that the liquid is rotated around the vertical axis. This is similar to the movement of liquid in a cognac glass. This auxiliary movement needs to be performed from the beginning and along with the applied tilting rhythm.  

Tilting agitation, as in holding the tank and rotating the wrist, is not sufficient. The developing tank should additionally be tilted and rotated so that the liquid is rotated around the vertical axis. This is similar to the movement of liquid in a cognac glass. This auxiliary movement needs to be performed at the beginning and along with minimum every second applied tilting rhythm.

It has no large influence on the developing time (depending on the sort of developer and the time of development). You may have to adjust the development times accordingly.

(G) Tilting time intervals by more than a half minute should be avoided! (G)

The developing solution with this reel must be at least 150ml and the reel must be positioned full down on the centre tube. When developing with several reels at the same time (8×11 and 35mm for example) the 8×11 reel should also be placed completely down on the centre tube.

Now follow the manufacturer’s instructions for the use of a stop bath (to neutralize the developer) and fixer. The first washing is often done in the tank.

After the development process

The washing should follow a fixing bath, for which distilled water with a minimum (!) additive of wetting agent should be used. Lift the reel from the developing tank, let the drips run off. Holding the lower flange in the left hand unlock the bayonet with the right hand and a twist anticlockwise. Do not twist the top flange as the pin is still in place. It will lift off easily when the bayonet locking collar has been removed.

If you are using a large JOBO developing tank it is easier to remove the reels from the centre tube first by pushing the tube downwards. The film can now be removed to dry. Rinse all the reel parts off before the next use with warm water and dry these carefully before storing. 

We hope you have a successful start developing with the 8x11film-Reel but we are always grateful for suggestions and improvement. Technical specifications and guide are subject to change and correction. All rights reserved.

Last updated 31st August 2007.

Yours sincerely, Marcus Michael Dunkmann, 8x11film.com

Reflecta MF 5000 / Prime Film 120 pro

There were problems with shear endless initializing sequenzes.

I tried another computer (my laptop) with fresh install of cyberview X5 and short, direct connected USB cable, no such luck.

Trying with holder in, holder out, sometimes got a connection, sometimes not.

The german software site

https://reflecta.de/de/downloads/drivers2/~nm.50~nc.108/Driver-and-Software.html

had older versions than the US site:

https://www.scanace.com/sd.php?cid=2&pid=8&pcid=21

I made a firmware update to 1.37 – the scanner works again….

Reversal processing of photopaper

You need to overexpose the paper up to 3 stops, never underexpose.

Chemistry:

Paper developer, normal or thinner than usual

Rotes Blutlaugensalz, 40g/Liter water to bleach

Natriumsulfit, 90g/Liter water to clear

lightsource to flash the paper

Overexpose the photopaper up to 3 stops (if to dark, overexpose more)

Develop fully, paper will be rather dark.

short stop in water

Bleach. Minimum 2 min. When nothing more happens,

short stop in water

Clear. Minimum 2 min. Pic gets milky

Water Stop, put paper in with pic upside.

Flash paper: minimal flash or light. (if you do sepia or sulphur toning you do not need the flashing or the second development, the toner does work without these steps)

Second development, you can thin the developer 1:1.

5. Fix, long Waterbath

If pic isa to dark: In light bleach with 1:5 soluted bleach till the result is good and than stop in water. Again developing of the highlights in thin (1:10) developer, repeat if needed.

Another Fix and waterbath….

(This procedure was published from Rüdiger Hartung (great guy btw) in the facebook group Analoge Fotografie.)

Salt printing

Typical procedure:
1.  Coat paper with salt solution and dry.
2.  Coat paper with silver solution, and dry thoroughly in the dark.
3.  Expose paper by contact printing with a negative under UV or sunlight.
4.  Wash in running water for 2 minutes. 
5.  Tone
6.  Fix for 10 minutes.
7.  Wash for at least 30 minutes. 
The wash may be accelerated by the use of a wash aid such as Kodak Hypo Clearing Agent or a 20% solution of sodium sulfite.
from The Photo Miniature #69 Salt Solution Sodium chloride 60 grains Citric acid 120 grains Distilled water 7 ounces Soft gelatine 1/2 ounce Sensitizer Silver nitrate 150 grains Distilled water 4 ounces
The salt and acid are first dissolved in the water, and then the gelatine is added, and
the whole stirred and gradually heated up to about 40°C (105° F) until complete solution has taken place. 
The solution must be strained or filtered through two thicknesses of muslin to free it from small insoluble particles of gelatine.

Das Papier grundieren

Für ein Papier in einer Größe von 21 x 30cm wird ein Liter Lösung zum Grundieren benötigt, für ein 30 x 40cm großes Papier sind es zwei Liter. Für einen Liter Lösung wird zunächst ein halber Liter demineralisiertes Wasser auf etwa 42°C erwärmt. In dieses Wasser werden dann jeweils 21g Ammoniumchlorid und Natriumcitratmit eingerührt. Wichtig ist, die Bestandteile sorgfältig miteinander zu vermischen, bis eine völlig klare Flüssigkeit entsteht. Anschließend wird ein halber Liter kaltes Wasser hinzugefügt und die Lösung in ein flaches Gefäß gegossen. Wenn die Lösung etwa Zimmertemperatur erreicht hat, kann das Papier gesalzen werden. 

Dazu wird ein Blatt Papier in die Lösung gelegt. Nach einer Minute wird das Papier dann gewendet und dieser Vorgang wird noch vier weitere Male wiederholt, so dass das Papier insgesamt fünf Minuten lang in der Lösung verbleibt. Anschließend muss das Papier etwa 24 Stunden lang trocknen. 

Gesalzene Papiere sind haltbar, so dass durchaus mehrere Papiere auf einmal grundiert werden können, wobei sie dann in einem pH-neutralen Karton gelagert werden sollten. Wer sehr scharfe und tiefe Drucke herstellen möchte und nicht sicher ist, ob die Grundleimung seines Papiers hierfür ausreicht, kann eine zusätzliche Leimschicht auftragen. 

Dazu werden 8 Gramm haushaltsübliches Gelatinepulver in das kalte Wasser gerührt und dieses Wasser wird dann nach einer Quellzeit von 20 Minuten in die warme Salzwasserlösung gegeben. 

Das Papier beschichten

Für die Beschichtungslösung werden 60ml demineralisiertes Wasser in eine braune Flasche gefüllt und mit 8 Gramm Silbernitratpulver vermischt. Wenn sich das Pulver vollständig aufgelöst hat, werden etwa 0,5ml 25%iger Ammoniak hinzugefügt. Durch das kreisförmige Schwenken der Flasche wird die Lösung sehr trüb. 

Nun werden sooft jeweils 0,5ml Ammoniak zugefügt, bis die Lösung auf einmal wieder vollständig klar ist. Anschließend wird die Lösung auf dem Papier verteilt, wobei wichtig ist, dass die Lösung das gesamte Papier gleichmäßig bedeckt. 

Die Lösung benötigt etwa fünf Minuten, bis sie in das Papier eingedrungen ist. Danach wird das Papier mit kalter Luft auf beiden Seiten getrocknet. Warme Luft ist für das Trocknen nur bedingt geeignet, denn sie macht die Beschichtung unempfindlicher, was zu weichen Kontrasten und unscharfen Bildstellen führt.   

http://www.edeldruck.org/Edeldruck/Salzdruck.html

Scheimpflug

Tilting the front or back plane with a large format camera is a important feature.

The Scheimpflug rules explain the effect.

It states that the film-, sharpness- and lens plane meet themselves at some point.

In a usual small format camera they meet in infinity, therefor the planes are strictly parallel : III

As soon as you tilt, the planes meet and you can play with depth of field:

This is a picture of a view camera with lines drawn through the film plane, the lens plane and also showing the subject plane.  All three planes cross at the Scheimpflug Line.
Merklinger, http://www.trenholm.org/hmmerk/
http://www.trenholm.org/hmmerk/VCGM.gif
The Hinge rule
Diagram showing how depth of field works for view cameras.
Photograph of Lisa holding a surveyor's rod that indicated the position of the plane of sharpest focus for a view camera.  Copyright C. Reardon & H. Merklinger 1995.

Front plane tilting needs a larger image circle of the lens and puts the film to the edges of the image circle, out of the optimal sharpness region of the lens.

Back plane tilting avoids this problems.

Usually the tilt is just a few degrees, much less I expected at first.