I see the resolution differences between the 4X5" drum scan and the P45 as quite minor, but with a slight edge still going to the drum scanned film, But when you consider the time and cost of shooting film, processing it, and then scanning, the advantages of a 39MP back like the P45 are compelling. And, because there's always someone with a different opinion, it's worth mentioning the anecdote that a colleague of Charlie's, who owns an Aztek drum scanner, commented "why are you comparing the P45 to the inferior Tango scans?" Charlie took him up on the challenge, and while on a scanning target the Aztek proved a little sharper, on one of the 4X5" Velvia images from our test set-up Charlie says he could see no real difference between scans from the two machines. Needless to say, inexpensive desktop scanners will perform at a lesser level than either of these drum scanners, and I would expect in this instance to see the 39MP digital file show a clear advantage.
So if we have a close race between a 39MP back's files and a 4X5" drum scan, where does that leave us? A traditional enlarger made print can't hope to compare, and so we now appear to have a new ball g-a-m-e, with top-tier medium format digital close to equaling 4x5" large format. And to my eyes images from the 16Mp Canon 1Ds MKII are awfully close to those from drum scanned 645 format Velvia. (Don't confuse the texture added by film grain with detail. Also, try different sharpening approaches with each and see the difference that this can make in perceived resolution).
As for the other camera and back comparisons, the only real surprise is that the P30 ended up below the P25 in the area of resolving power. The other rankings are as expected. The superiority of the Betterlight scanning back is no surprise, but when you figure in the shooting limitations that a scanning back has over a one shot, its small resolution advantage doesn't appear to me to be all that compelling. On the other hand other aspects of a scanning back's image quality are not to be denied.
The lens comparisons were an eye-opener. I think it's fair to say that once we're dealing with top-ranked lenses, the difference to be seen in real-world photography begin to be quite small. The shocker for Bill and me was how well the Hasselblad 50-110mm zoom performed, actually outperforming the 120mm Hasselblad Macro, a theoretically superior lens.
Which only goes to show that the evidence of ones eyes are always to be trusted over theory, opinion, and so-called common wisdom.
What We Didn't Test
This test was about resolution. We did not look at or evaluate dynamic range, colour accuracy, noise, or any of several other performance parameters. Not that these aren't interesting, or even important. For some applications one or more of these may be even more important than resolution. But to have included them would have made this test much more complex and time consuming than any of us had time for.
Интересно, а как ее можно закрыть по этому тесту, если сравнивали _только_ разрешение??? Или народ больше ничего не интересует? Лично меня это в последнюю очередь волнует
Кстати, CD их вто-то заказывал, которых с исходниками а не мелкими картинками?
Уже 35 мм плёнку никто не рассматривает как могущую конкурировать с цифрой.Начали от 645 формата.Уже не интересно даже об этом говорить.
Ну... Зайдите на www.zeiss.de, они там рекламируют свой новый Цейсс Икон и сами себя от имени покупателя спрашивают: почему плёнка, а не цифра? Один из ответов: современные матрицы имеют проблемы на широких углах. Кого-то это не волнует, но шедевры типа "хологона" или 15-мм "дистагона" могут отдавать всё пока только на плёнке...
Ну, и уж совсем курьёз. Листал я "Сов. фото" этак год за 1964-й (примерно), там ОРВО хвалило свою плёнку NP15. Взяли, дескать, "Экзакту" с "тессаром" 2,8/50 и получили со штатива 70 линий на мм, а со слегка дрожащих рук - 50... А топовые цифрозеркалки имеют разрешение (без муара) как раз 55-60 линий, т.е чуть лучше, чем дрожащие ручки с камерой и плёнкой 40-летней давности... А разница в цене, как бы это сказать... Конечно, там было всего 25 АСА, но ведь любопытно...
Извечный спор: конец или новый виток -
18.05.2006, 19:53
Линейный вид
