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Filmtest with contrastcurves and grainstucture.

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Dag_Nystuen

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Sep 7, 2014
Messages
10
Location
Trondheim, N
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It would be nice to get some feedback on the big filmtest we are working on. I guess norwegian text can be a challenge, but the importaint information is in the numbers and the samplepictures.

http://www.fotoimport.no/filmtest/fkadonal.html

There are different pages for each developer and for each film.

Kind regards

Dag
 
Wow!!!! Thanks for this test!!! I admire your perseverance with all the work involved. I will be watching this thread for any updates that you do as your testing progresses. I will also be bookmarking the website for future reference. Thanks for this enormous task!!! This is something that I have always wanted to see. FWIW it has made me rethink my Delta 3200 developer choice.............

Cheers,
Sam
 
I consider D-76 the standard by which all others can be measured. Please feel free to convince me there's something better. :wink:
 
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Thank you for that valuable comparison. The web site presentation makes it very useful and easy to use.
 
I wouldn't mind seeing some Rollei Retro 80S in there.
 
Congratulations and thank you for this work. A few comments:
- You ask feedback on APUG, so you expect an audience outside Norway. How about an English text version?
- What is the unit on the horizontal axis of the graphs? I guess one step is 0.1 logE, but not sure.
- Please explain the procedure for exposure and measurement; also would be nice to see not only smoothed curve, but also raw data points
- Curve for Tmax-100 in Adonal. Did you double-check that really strange curve?
- As already stated, D-76, the reference standard, will be welcome
 
Thank you. A very nice presentation.

The TMax 100 curve really is odd beyond just the bump in the middle. I've not used it in Rodinal, but am used to seeing a roll off in the highlights more like Tri-X and (most older films) and less like TMax 400. That is also showing up in the Pan F+ and HP5+, where I would also expect more roll off in the highs. Does anyone know if this is a characteristic of Rodinal? It will be interesting to see how D76 compares. I'd be most interested in that developer at 1:1 dilution where it seems to have a good compromise of grain, sharpness, and speed.
 
I agree, impressive work!

a few questions/suggestions:

* as bernard_L (there was a url link here which no longer exists) using a more conventional format for the x-axis would be a good idea. At first sight, the values look like EVs. But that would mean that (looking at, e.g. the charts for PanF in FX39) an exposure range of 14 stops would correspond to a density range of only 1.2 ...I guess the steps are supposed to be half stops, but that'd make the numbers confusing. I suggest you go for either whole- or third-stop steps and use either logH values or EVs, and don't forget to clearly denote the unit (as you've been taught in school) :smile:

* it would be nice to see a representative of the Beutler family among the developers, such as Neofin (the only surviving one, I guess)

* You don't seem to include information on how the films were exposed. If the dev times you're listing are supposed to serve as a starting point for other people's own tests, they're of rather limited use if they come without the EI that the exposures were based on. One may infer from the ISO specifications that come with your reference curves that your tests were conducted at box speed, but again, it's a little vague...

--Nils
 
- We are planning a english verson of the test.
- T-Max 100 in Adonal has this strange curve that inidicate relative high contrast in the midtones, lower contrast in the highlights and then higer contrast in the overexposure part of the fim. We have seen this in several tests.
- The steps are half stops because we are using the T2115 from Stouffer (two of them).
- The samplepicture is taken whit a Canon 50mm 1.4 - aperture 8.0 - exposuretime 1/2 sek.


Dag
 
My question and that of AntiLynd (how is the film exposed) referred to the sensitometric part of the test; sample picture is only qualitative. Presumably you use a sensitometer (The image of the T2115 on a 24x36mm negative would be difficult to measure) with contact exposure. Model?

Again, D-76 1+1, a standard, would be welcome by (I guess) a number of readers.

T-Max 100 in Adonal has this strange curve
Click to expand...
Definitely a combination to avoid.

Your straight line is a neat way to visually indicate the sensitivity point and target slope; looks like hardly any film/dev achieves the nominal ISO.
 
We use a Heilland TRD-2 densitometer.
We make a contactprint of the two T2115 (one together with a evenly exposed film with a sutiable density) on a 5" part of a 135 film.
The work with the D-76 1+1 test started yesterday. But it is a lot of work. Maybe we manage to have something ready before Photokina.

I suspect that our ISO setting is a bit low. But it is the same all through the test.
 
Kodak release testing (last I worked there) was D76 straight using released process times. The ISO rating was strictly observed and matched with the product or it was not released. I hesitated to comment before, but basically, the threshold speed appears on but the mid scale speed is low. This does indicate a problem of some sort such as under development or some such.

PE
 
My only other comment is about the detail crops. Using a flex tight scanner fairly often I can say the scans look sharp but the detail put on some of the films doesn't. In my experience I get a much greater difference between some of those films in detail on a similar scanner.
 
- We have now posted a new version of the testpages with english text and possibility for downloading the hole testmotiv.
- As you know - we are norwegians - so if you have suggestions to improve the english verson of the text, plese tell us.

- The D-76 1+1 is getting closer.....
 
Dag,
Couldn't find the English test page. Would you mind posting the link please? Also at some point I would be very interested to see any results from an Xtol/Delta3200 and a DDX/Delta3200. Just a wish list so to speak :whistling: Anyway thank you once again for the tremendous work compiling these tests!

cheers,
Sam
 
samcomet said:
Dag,
Couldn't find the English test page. Would you mind posting the link please? Also at some point I would be very interested to see any results from an Xtol/Delta3200 and a DDX/Delta3200. Just a wish list so to speak :whistling: Anyway thank you once again for the tremendous work compiling these tests!

cheers,
Sam
Click to expand...

Look for the english flags. The importaint part of the text is now translated.
It nice to hear that you like the test.:smile:
 
Are the curves for Adox CMS 20 rated at ISO 20? The Adotech II development time given is for ISO 20.

Also, the new plastic bottles of Adotech II specify 20 degrees C for ISO 20 instead of 24 now (not sure why) as opposed to the glass bottled variety.
 
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Thanks Dag, FP4 looks really great in your D76 test.
 
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