Sometimes I look at the full frame DSLRs and marvel over the resolution. Then I realize a lot of the time I shoot P3200TMZ. Haha. That has all the resolution of what, maybe 2-3 mp?
I cant help preferring the skin tones on the digital camera...
Thanks Bnstein, good to hear you appreciated all the hard work that went into this. Actually, if I had known how much work it would become, I may have not done it all. But that's mostly my own fault, I have a tendency to go deeper and deeper with these things, trying to evaluate and see things from different perspectives.
.....
Marco
Hello Marco,
I know very well what a lot of work these kinds of tests are, because I am currently involved in something similar.
Because I know the problems of such tests please let me add some aspects:
1. I see one essential problem with your test: Your test chart is not a good choice. Your "Image Engineering" test chart is made for low resolution digital cameras, not for high resolution digicams or films. The maximum resolution is only about 40 Lp/mm, a rather low value. Much lower than both the physical resolution limit of the 24 MP Sony sensor (which is 85 Lp/mm), and much lower than the resolution limits of all the films you have used.
The interesting question is, how is the performance near the resolution limit, and where are the resolution limits of certain lens/film/sensor combinations (system resolution).
To answer these questions you have to use resolution charts with at least 100 Lp/mm, better more, because TMX, Velvia + Co. can resolve more than 100 Lp/mm with very good prime lenses.
If you would have used a chart with higher resolution figures of above 100 Lp/mm you would have seen that at 80-85 Lp/mm the Alpha produces artifacts and is not able to resolve the fine details, whereas your films can resolve these extremely fine line patterns.
So, your test is more like buying a Porsche, driving on a highway at 55 m.p.h and making the conclusion "hey, this car can be driven at incredible 55 m.p.h.". You know what I mean.
Resolving of 40 Lp/mm is very easy and not a challenge at all. Neither for film nor for better digital sensors.
2. My test results in the 40 Lp/mm area with film look much scharper and better defined than yours. Seems that something in your scanning operation may be wrong.
3. Some details about my own results: I am currently involved in an intensive test programme about resolution of modern films and sensors. We have not finished all tests at the moment. A lot of work has still to be done. Some films and sensors have yet to be tested. Probably we can publish all of our results next year. But so far we have found that a lot of modern films have significantly higher resolution than the best digital sensors. The physical resolution limit of a 22 MP 24x36mm sensor is 80 Lp/mm, the resolution limit of a 24x36mm 24 MP sensor is 85 Lp/mm. We reached it (as well as dpreview for example, look at the Canon Eos 1 Ds Mk III test there). With many films we've got resolution values above 100 Lp/mm for system resolution (film + lens). With most of the modern ISO 100/21° films such resolution is possible (with very good prime lenses even higher resolution is possible). We are testing at a very moderate object contrast of 1:20.
With Fuji Provia 100F, Velvia 100F, Velvia 100, Sensia 100, Astia 100F, Kodak E100 G(X), Elitechrome 100, Kodak TMX, Fuji Neopan Acros and Agfa APX 100 we have achieved 100 Lp/mm. The 100 Lp/mm pattern is so clear with all these films that we can conclude, that the resolution limit is significantly higher than this value. Therefore we will continue our test trying to measure where the resolution limit really is.
Even with Fuji Provia 400X, Fuji Superia Xtra 400 and Kodak TMY-2 we achieved 100 Lp/mm. With the new Rollei Advanced Technical Pan (ATP), developed in the dedicated ATP DC developer and exposed with ISO 40/17° we achieved so far a system resolution of 140 Lp/mm. The 140 Lp/mm pattern is so clear that this film as well is not at its resolution limit, further tests for higher resolution are necessary. This film has such extremely high resolution, sharpness and fine grain that you can get results with 35mm film which are on a similar level with medium format. And now this film is obtainable as 120 as well.
We have achieved all these resolution values not only under the microscope, but also on paper in the traditional wet darkroom. We are using the Rodenstock Apo-Rodagon N 2,8/50. With a slide projector using a very good projection lenses (Docter, Zeiss, Leica) we have got so far 100 lp/mm on screen with the color slide films and 140 Lp/mm with Rollei ATP (much much more than every beamer on the market can deliver). Our tests ar not finished so far, because we have not reached the resolution limits of some films and lenses (both projection and printing). Therefore we are testing some films for even higher resolution values in the printing and projection. Then we can publish all of our results.
But I want to add some results of other scientific resolution tests made by Carl Zeiss. Zeiss is clearly emphazising the qualities of film, especially it's superior resolution. Zeiss is one of the world's most important optic companies (probably the most important). About 99% of their camera optics are made for digital cameras. But nevertheless they say clearly that film has higher resolution in many cases (of course dependant on the film you are using). Here are some of their test results (using normal Zeiss 35mm and med format lenses): Agfa APX 25: 200 Lp/mm; Kodak Ektar 25: 200 Lp/mm; Kodak TMX: 180 Lp/mm, Fuji Neopan Acros 100: 160 Lp/mm; Fuji Velvia: 160 Lp/mm; Kodak BW 400 CN: 150 Lp/mm, Kodak Porta 160 VC: 160 Lp/mm; Kodak TMY (old): 120 Lp/mm, Fuji NPZ 800: 110 Lp/mm. And the absolute resolution record with Spur Orthopan UR with 400 Lp/mm (all published in their magazine "camera lens news" No. 17, 19, 20, 22, 24 on their home page).
3. You wrote in the introduction concerning the new Ektar that new films are rare these days. I have to disagree here looking at the new films which were introduced in the last two years:
Kodak: Portra 160 NC-2, Portra 160 VC-2, Portra 400 NC-2, Portra 400 VC-2, Portra 800 Version 3, Gold 200 new, Gold 400 new, Portra 400 NC-3, Portra 400 VC-3, TMY-2, Ektar 100.
Fuji: Fujichrome Provia 400X, Fujichrome 64 T Type II, Superia 200, Fujicolor 100. Velvia 50 II (resurrection).
Maco/Rollei-Film: Rollei Ortho 25, Rollei Pan 25, Rollei RSD, Rollei Digibase CN 200, Rollei Infrared 400, Rollei ATP 1.1, Rollei CR 200, Superpan 200, Retro 400S, Rollei ATO.
Next year further new films will be introduced: Rollei Retro 80S, Rollei Retro 100 Plus and ATP 3.1.
Ilford: Resurrection of SFX 200.
Fotokemika: Resurrection of IR 820.
Even in the "golden analogue days" we've had very seldom time frames with such a lot of new films.
Best regards,
Henning
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