As a photographic study I decided to make comparison, how 35mm format
(film/sensor size is 36mm x 24mm) compares to large format. I
used 21mm lens with Canon 5DmkII (36mm x 24mm sensor) and
100mm lens with Canon 5DmkII using panorama head.
In order to have same field of view with 100mm lens as 21mm lens has on 35mm system the sensor would have to be 100/21=4.76190476 times bigger. From this we can calculate that film/sensor size would need to be 171.428571mm by 114.285714mm. Common large formats are 5" by 4" and 10" by 8". This imaginary film/sensor would be slightly larger than 5" by 4" being 6.75" by 4.5".
Both photos are taken with aperture of f/5.6. Naturally the 100mm photo has much less depth of field, which will cause the subject of photo to stand out more in 100mm photo. The shallow depth of field in wide angle photos is something which is very appealing for myself. Large format digital camera might be nice, thou I doubt many 8" x 10" lenses are sharp at f/5.6...or even have so large aperture.
Carl Zeiss Distagon T* 2.8/21 ZE @ f/5.6, 1/4s, ISO 100:
Carl Zeiss Makro-Planar T* 2/100 ZF @ f/5.6, 1/4s, ISO 100 - panorama made from 60 exposures:
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