Originally posted by ekaphoto I know this is ever changing with technology and it is apples and oranges but, has anyone done a quality comparison with the new 645 digital vs 67 film with a drum scan? I know they are different looks. I have been shooting a digital SLR for years now but wondering a couple things between the two formats. If possible the 67 vs 645 D vs 645 Z
File size comparison Drum scan vs 645 D vs 645 Z
Dynamic range digital vs slide vs print film and 645 d vs Z
Color representation. I know used to be analog could capture more colors than digital and is probably so. The thing is most photos are put on the web so it would be a print comparison. Also what is the difference of the 645 d vs Z ?
Last but not least is the 645 Z worth the extra cash over the D? I am not a professional so it would have to be a significant difference. For reference my current digital camera is a Canon T3i. I am sure both would be a big step up in quality not to mention price.
The questions are largely smudged by the big array of variables that are incidental to each medium. In film, the drum scan size is optimised for the print output to avoid bloating and loss (for either RA-4 or giclee output); your question about comparing file sizes between the 645 formats is like asking, 'how long is a piece of string?'. My own drum scans are 66Mb for an 80cm across RA-4 hybridised print from 6x7 (also 6x6). It could be anything in terms of size, but it will be matched to the print size and resolution of the printer (typically 300dpi). .
Slide film, e.g. RVP50, has a very, very narrow latitude (Provia 100F has a bit more) and cannot be compared directly to the expandable dynamic range of digital cameras. The palette/gamut is wider than digital, but it is clipped during the transition from scan to print, where the gamut is converted in absolute or colourimetrically-combined [print] profiles. Images destined for the web are straight conversions to the RGB colour space of typically AdobeRGB or sRGB, or custom profiles (rare for web use, but more common for printing).
When a drum scan is prepared correctly from a very well executed transparency, it will beat anything out of digital,. without floss or fanfare (HDR, sliders, sharpening, selective light, stars shining in the sky on a bright sunny day...). In other words, it is not about the format that can make images successful, but the skill and knowledge of the photographer to see with the camera, rather than through it.
Print film has a much wider dynamic range (10+ stops) than slide film (+/- 4 stops from baseline, can be extended with specialised spot metering technique) and easier-going contrast. Sunny16 can be used with print film, but it is unwise to use it for the more temperamental E6 emulsions previously mentioned, which require a knowledge of interpreting the scene's contrast and brightness to fit the limited dynamic range of the film. Photographers will a background in print reprographics and photogravure will prefer to use, and have a solid understanding of, slide film and its suitability for printing over using negatives
I can think of many things more useful than to lose $6,000 on a 645Z (at current used market prices). It's possible to buy a serviceable car for that price! Unless you are a professional, successful, have produced and sold work and have a solid foundation in traditional photography then no, the 645Z is not a good buy, but would be a waste of money.. There are professionals who lease/hire the 645Z and lenses for their use, though I've noticed a lot moving to Phase 1 recently (a much bigger financial proposition!).
I am not familiar with the Canon T3i.