Re: Konica 120 format

["Gaetano \"Kiodo\" Chiodini" <kiodo@xxxxxxx>]

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At 19.32 14/01/98 +0100, you wrote:
>Has anyone had good luck with getting grey gradations (like HIE) on the
>Konica infrared?

Sure! My way is:
I meter the film at ISO 50 when unfiltered. I apply a correction of +2.5
stops for every filter from yellow to dark red (R29). I'll develop in
Rodinal 1+75 (8cc Rodinal from the bottle in 600cc of tap water) 9min30sec,
20=B0.
If you can find Rodinal Special, try this: E.I. 50 (unfiltered, plus a
filter correction, if you use one). Develop 8min30sec in Rodinal Special
1+75 (8+600) at 20=B0. Agitation, both cases, is first 30secs, than 5secs
every min.
I've collected on DejaNews a lot of suggestion about how people develops
this film. (I didn't like the results with Microphen: this film needs
something less brilliant).It's all in the attached file. If someone knows a
better way to do it, I can't wait to try it.=20
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Konica IR-750, Exposition and development
as suggested by newsreaders.  

- - Filtration; Use a Red filter for extreme effects or low contrast lighting, Orange for bright sunny days and 
good tonal range, and yellow if you want a light sky with full IR effect elsewhere. EI of about 12 with any of 
the filters - shadow detail, rendition will vary. 

- -PMK Pyro is best developer, as it hardens the soft emulsion, gives fine grain and a margin of safety in 
highlights - 10 m @ 20c. Or try Ilfosol- S. Many others work OK...pretend its an infrared Agfa 25.

- -I use Konica I/R exclusively, for my I/R applications. I develop it 9 minutes in FG7 1:15 with normal 
agitation. 

- -Personally, I use a #25 filter at EI 8, a #21 at EI 10 or an orange at EI 16 I process either in  Ilford Microphen 
(1 part stock to 3 parts water), or in the Vitamin-C developer (carbonate version) as described in the Nov/Dec 
1994 Darkroom & Creative Camera Techniques.

- - I have used EI 100 (or 200 for slides) in the camera and all exposures are metered with the cameras own 
meter (through the lens and filter). Here is some technical information about the pictures:
Cokin P 003 red Development: Agfa Rodinal (1+25) 5 min. at 20C 
B+W 091 Development: Ilford Ilfotec LC29 (1+19) 5 min. at 20C 
B+W 091 Development: Ilford Ilfotec LC29 (1+19) 5 min. at 20C 
B+W 091 Development: Agfa Rodinal (1+50) 8 min. at 20C 

- -I am shooting the Konica IR 750 in 120 format, with a #25 filter, and exposing at 12 ASA using an incident 
meter, then processing in Ethol TEC for 15 minutes.  I'm getting acceptable results, and really like the
compensating effect on the grey scale

- - I use a jobo atl 1000. So, temps are all 75 degrees, and constant agitation. For D-76 and Konica 750 120 
size, I have found 4min 30 sec. to work well. 
 
- -For development I use HC110 dil B for 6 minutes at 68 degrees.

- -I have recently used XTOL, at the 1:2 dilution, with 120 format Konica IR and  had great results. Souped for 
6 minutes at 75 deg F with two slow inversions  every 30 sec.

- -Ethol TEC for 14 minutes gives much better results... the compensation on the top end of the curve is a big 
deal when using IR where you can't always count on accurate metering.

 -I have found that I get printable negatives using HC-110,     dilution B for 5 1/2 minutes at 70 F.

Edward M. Lukacs <eml@xxxxxxxxxxxxx> wrote:
- -Good old Microphen!  My favorite way to use this film is at 1:3 dilution, and higher (25C) temperatures.  I 
have used it with TMX, TMY, Konica 750 Infrared, HP-5, and Delta 400, always getting impressive film 
speed and unblocked highlights,

- -I currently use an E.I. 25 with a Red #29 filter. The red29 is a 4 stop loss, while the #25 is a three. So I 
effectively reduced my exposure by 2 stops. I us Tmax developer and times and temp for Plus-X.  I have not 
messed with other developers as I figured this combo worked well, giving me wide tonal range, sharp iamges 
and grain in line with 400 speed B&W films.

- -I get good results at ASA 6 using a hand held meter and a Rollei infra-rot filter.  I develope in X-tol 1:1 for 9 
minutes.

- -hannu.jarventaus wrote: I have B+W 091 filter, which should be equivalent to #29. For Konica IR film with 
this filter I use EI 100 metered through the filter and lens with cameras own meter. 
The film can be developed in TMAX (normal 1+4 dilution) 5 minutes at 20C temperature.

- -My experience with Konica 750 is using a #25 filter and an IE of 12 on a hand held meter with no further 
filter factor (wow!).  I usually develop it in D-76 for 8 minutes at 68 F.

- -You might want to try Microdol-X or, interchangeably, Microphen, diluted 1:3 at 25C for maybe 8 to 9 
minutes.  I found that this produces excellent negatives which print easily and with good effective film speed.  
Of the two, Microphen will deliver about 1/3 to 1/2 stop more speed with no difference in gradation or grain. 
As this film is very slow, a slight but meaningful increase in speed can be gained by immediately following 
development in an alkaline bath, with no rinsing inbetween. The one that I use for this purpose with many 
different films is the "B" solution from the original (1927) Leica Divided Developer.  It consists of:

Sodium Sulfite (Anhydrous) 6 Grams
Sodium Carbonate (Anhydrous) 15 Grams
Water (cool) 1.0 Litre

This is poured in the tank immediately after the developer is poured out.  Agitation is continuous for three 
minutes. Then wash with plain water, as an acid stop bath might cause CO2 bubbles in the emulsion, and fix 
normally.  With all films this gives a useful boost in shadow detail with little or no difference in highlights and 
little change in grain structure.  The effect is generally worth maybe another 1/3 to 1/2 stop, and generally 
leads to a beneficial increase in deep shadow sensitivity and contrast while having little effect on highlights.

- -I processed Konica IR in Ornano ST 20 Gradual developer with outstanding results. Here was my working 
method:

Light meter- Gossen Luna Pro Digital
ISO rating- 32
Camera Filter- #25 red.
Developer- ST 20 Gradual Dilution- 1:9 Temp. 70 Degrees F., or 20 degrees C.
Time- 10 minutes
Agitation- Continuous for initial 30 seconds, and then 2 inversions every 30 seconds.

- -My developing time for Konica IR 750 with undiluted XTOL is 9 minutes at 20C.

- -I use Ethol TEC with the Konica 750 film and like the look a lot.

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Gaetano "Kiodo" Chiodini
kiodo@xxxxxxx
03472245535
051873284
+393472245535
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