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  1. #11
    Pioneer's Avatar
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    I am not sure I can provide you with any objective test results since I don't do that, but I can give you my impressions.

    At ISO 25 it seems to respond quite well. The few rolls I have shot have been with 120 film in a Zeiss Ikon Favorit 6x6 TLR so grain is not an issue. I do have some 35mm but I just haven't had a real opportunity to use it yet. Resolution seems excellent but I don't shoot test charts so I can't give you any numbers.

    This picture was cropped from a negative scan done on the Epson V500, so it is already a bit limited. I added a bit of contrast since the negatives are low contrast. But that is more a factor of the lens on the Favorit, not the film.



    This is what I can tell you.

    So far I have shot at ISO 25 and developed in D76 1+1. The negatives print very well. I have one print done at 16x20. The print is very clear with excellent detail, but I expect that from a 6x6 negative, so no surprises.

    Bottom line, I like the film a lot. It will make a very good replacement for Efke 25. I am not yet ready to substitute it for TMX100, but with some work and experimenting it could easily get there.
    Dan

    The simplest tools can be the hardest to master.

  2. #12

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    If it is any help, Pioneer's post has reminded me of the test article I mentioned. The tester took the same frame at EIs 6,12,25,50,100 and 200 and has shown the results. Quite illuminating. While box speed appeared to be the best it seemed to me that it has the latitude to be exposed at +1 so EI50 is nearly as good.

    The tester processed in Rodinal and seemed to suggest that the processing was quite critical but none of the posters here seem to reinforce that. Maybe it is less critical than the tester suggests

    Another interesting aspect was the claim that the resolution is so good that in one picture, the middle building which is quite a distance from the camera, can be "blown up" so that you can count each brick on the face of the building. That's quite a claim but it does seem to have high resolution

    pentaxuser

  3. #13
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    I haven't tried anything but ISO 25 but my usual pattern would be to try a stop lower and a stop higher, ISO 12 and 50. I usually do my own testing because my developing solutions and routines are frequently a bit different, and can show different results.

    As for resolution, though I don't specifically test I can say that the detail in my 16x20 print is quite good. TMX100 is very good as well though, so I can't say it is the best I've seen. Efke 25 was very good as well.

    Contrast seems a tad lower than I would expect from my experience with Efke 25 and Pan F 50 but I have not done enough shooting to validate that yet. Developing in Rodinal may bump the contrast a little as well.
    Dan

    The simplest tools can be the hardest to master.

  4. #14
    Snapshot's Avatar
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    Thanks everyone. Your input is greatly appreciated. I have a few rolls on order and I will see how it performs.
    "The secret to life is to keep your mind full and your bowels empty. Unfortunately, the converse is true for most people."

  5. #15
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    I have 2 35mm rolls - will shoot one of these days - and report . Probably I will develop in Technidol or Rodinal 1+100.

  6. #16
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    I have fifty rolls of 120 and hope to shoot one soon. I intend to use Rodinal 1:50 for... min. Looking forward to buying another fifty if it meets or exceeds my expectations. I have been begging for a film like this, in this speed, in this size, and in this lifetime.
    Everytime I find a film or paper that I like, they discontinue it. - Paul Strand - Aperture monograph on Strand

  7. #17
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    Quote Originally Posted by Snapshot View Post
    Thanks everyone. Your input is greatly appreciated. I have a few rolls on order and I will see how it performs.
    Henning Serger, the author of the article, is here on APUG. If he doesn't notice this thread, you could send him a PM asking for his comments
    I do use a digital device in my photographic pursuits when necessary.
    When someone rags on me for using film, I use a middle digit, upraised.

  8. #18
    Snapshot's Avatar
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    Quote Originally Posted by lxdude View Post
    Henning Serger, the author of the article, is here on APUG. If he doesn't notice this thread, you could send him a PM asking for his comments
    Sounds like a good idea.
    "The secret to life is to keep your mind full and your bowels empty. Unfortunately, the converse is true for most people."

  9. #19

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    Quote Originally Posted by K-G View Post
    The Rollei RPX 25 was tested in the latest issue ( III 2014 ) of the German magazine PhotoKlassik . The tester Henning Serger was obviously impressed by the film and according to the article he measured a resolution of 120 Lp/mm and an efective ISO of 20 - 40 . I don't know if you can get a copy of the Magazine in Canada but I enclose a link.

    Karl-Gustaf

    http://www.photoklassik.de/
    Dear Karl-Gustaf,

    thanks for mentioning my test report about the Adox CHS 100 II and Rollei RPX in the edition III.2014 of "PhotoKlassik".
    And also thanks to all the others here for their positive comments about PhotoKlassik.

    I've just discovered this thread incidentally. Due to lots of work my presence here is quite rare.

    To answer the questions of the OP concerning resolution and grain of the RPX 25:
    Well, as I am running a little test lab for lenses, film, developers, sensors I can give you test results of this film compared to all other films in this group of very fine grained, high resolution films.
    Here we go:
    First, some information about my test method: I am using several test patterns, and a resolution chart with an object contrast of 1:4 (two stops). That is an object contrast you can find in lots of details in your daily, normal photography.
    With higher object contrast details you will get higher resolution values, and with lower object contrast you will get lower values.

    Test camera is my F6, with MLU on, MC-30 cable release, 1/250s shutter speed, focus bracketing, Berlebach 3032 tripod.
    Test lens: Zeiss Makro-Planar 2/50 ZF at f 5,6.
    So the following resolution values give you the system resolution of the film and this lens in combination. With better lenses, you get higher values. And with worse lenses, you get lower values.
    The first, lower value represent clearly separated linepairs per millimetre, the second, higher number is the resolution limit at which a contrast difference is still visible.
    My standard test developer for the resolution tests is Spur HRX, because it gives very good sharpness combined with very fine grain, resulting in very good resolution.

    Rollei Pan 25: 80 – 90 Lp/mm

    Rollei RPX 25: 120 – 130 Lp/mm

    Rollei Retro 80S; ISO 25/15°: 135 – 145 Lp/mm

    Adox CHS 50: 90 – 100 Lp/mm

    Ilford PAN F+: 110 – 130 Lp/mm

    Adox CHS 100: 80 – 90 Lp/mm

    Adox CHS 100 II : 100 – 110 Lp/mm

    Adox Silvermax: 105 – 115 Lp/mm

    Fomapan 100 : 75 – 90 Lp/mm

    Ilford FP4+: 75 – 90 Lp/mm

    Ilford Delta 100: 130 – 140 Lp/mm

    Kodak Plus-X: 80 – 100 Lp/mm

    Kodak T-Max 100: 135 – 150 Lp/mm

    Fuji Acros 100: 115 – 130 Lp/mm

    If you want even significantly higher resolution and better sharpness, grain, then go for:

    Agfa Copex Rapid; ISO 25/15° - 32/16°; Spur Modular UR New developer: 165 – 180 Lp/mm

    Adox CMS 20 II, Spur Modular UR New or Adotech II developer: 240 - 260 Lp/mm.

    Grain:
    Finest grain of all by a huge margin has Adox CMS 20 II.
    Then Retro 80S follows.
    A little bit behind the 80S on a similar level Rollei RPX 25, TMX, Acros, Pan F+, Agfa Copex Rapid are following. The differences between these 5 films are very small and not really field relevant. And the ranking can be a little bit different when different developers are used.
    Then the discontinued Pan 25 and Delta 100 follow.
    After that Adox Silvermax, which is the finest grained of the traditional ISO 100 films with classic cubic crystals.

    And just for comparison:
    Under identical test conditions, same test chart, same lens and aperture, the
    Nikon D800 delivers 80 - 85 Lp/mm,
    and the D800E delivers 90 - 95 Lp/mm.

    And
    Provia 100F: 120 - 135 Lp/mm
    Velvia 100: 125 - 140 Lp/mm
    Ektar 100: 90 - 105 Lp/mm (Provia and Velvia also have a bit finer grain than Ektar).

    I hope these test results are helpful for you.

    Have a nice weekend,
    best regards,
    Henning

  10. #20
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    Great responses and question

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