Using Medium Format Cameras
The 120 roll films are 6cm wide and the number you can take per roll depends on the format of the camera. You can take 15 pictures in 6x4.5cm format, 12 in 6x6cm, 10 in 6x7cm, 8 in 6x9cm, 6 using 6x12cm or 4 with 6x17cm. If you want to get extreme an use 6x24cm just three images can be taken! 220 film is twice as long as 120 and, therefore, gives you twice as many exposures per roll, but you often need a separate film back for the camera to accept this type of film.
The key benefit of medium-format over 35mm is the larger size of the negative or transparency, which means less enlargement at the printing or reproduction stage. Commercially the main advantage of a larger image is impact. Editors receive hundreds of picture submissions weekly, so your pictures have to grab the editor's attention quickly if you want to be successful as a freelance photographer. The quality issue is also important if you intend making 20x16in or larger prints. A medium-format transparency printed this size on Ilfochrome will, all other things being equal, look sharper than the equivalent print from a 35mm transparency. Some picture buyers, mainly in the calendar industry, still insist on at least medium-format transparencies because of the extra quality they expect. You have to give the client what they want, not what suits you, if you hope to succeed.
But quality alone is no longer the most important factor when considering buying medium-format. There are other less tangible benefits to be gained.
With traditional wedding and portrait photography, the medium-format camera gives the photographer that extra kudos that sets him or her apart from the keen amateur. It also shows in the quality of an enlarged print that the professional will be aiming to sell to his or her client.
The handling of medium-format is very different from most modern 35mm cameras, which, in many cases, will slow you down and make you think carefully about the pictures you are planning to take. Most require that you use a tripod and that will also greatly improve your photography. The extra cost of each frame of film may slow you down making you ask the questions that every photographer should ask before firing the shutter. Why am I taking this picture? What am I trying to capture? Can this be improved?
Medium-format cameras don't always cost more than 35mm. A 35mm Leica, Contax or top of the range Nikon or Canon, for example, costs considerably more than an entry-level medium-format camera. Film and processing will cost more though, but as you're hopefully taking fewer pictures and perhaps having a better hit rate it is difficult to make a real comparison. The equipment is generally bigger and heavier than 35mm, unless you consider medium-format rangefinder cameras that defy that rule, such as the Mamiya 7, the Fuji range or Bronica's 645 rangefinder.
The Medium-format lenses can be expensive and as there are no independent options such as Sigma or Tamron you therefore must turn to Hasselblad for additional lenses if you buy one of their cameras. In many instances medium-format cameras have their shutters built into the lenses rather than the body. The disadvantage is that you pay for a shutter with every lens, rather than paying just once for the one with the camera. This makes the lenses considerably more expensive, but there's a big benefit that electronic flash can be synchronised at all shutter speeds making fill-in flash much easier to use in bright conditions.
The 6x4.5cm format shares much with 35mm in terms of the handling. The resulting pictures though are still far more impressive on a light box or just held up to a window than any 35mm picture would be. This apparently tranquil view was caught at the end of the day on a trip to the Lake District in September. I used a Mamiya 645 fitted with a 55mm lens and a .06 neutral density graduated filter. The exposure was one second at f/16.
Skiddaw Derwentwater Keswick 3921CB
The big advantage of 6x6cm format is that the picture is square, so there is never a need to take both an upright and horizontal version of the picture, though very often both can be cropped from the one frame of film, depending on how the picture is being used. This picture taken from Falcon Crag above Derwentwater shows the light cast on the autumn landscape by the late evening sun and shows two possible crops that can be made.
Move into 6x7cm and the variety increases with Fuji and Mamiya making rangefinders, Pentax with its 35mm style machine and Bronica and Mamiya with their large modular cameras that look like oversized 6x6cm models. The increase in size and weight is way out of proportion to the extra 1cm of transparency or negative they give you, but the ratio is everything.
The 6x7cm format makes a well balanced frame into which you can compose your pictures. This simple view of a tree and some hay bails might not have been such an appealing view in the traditional oblong of 35mm. When cropped to an oblong you loose the blue sky above the white cloud.
For my taste 6x12cm is the best, the most useable, the most versatile panoramic format of them all. 6x17cm is just a stretch too far for my personal preferences, but has proved itself to be an enduring and valuable format for calendars and advertising. Composing a picture in any panoramic format is a very different matter to composing within a near square format, or even the 'normal' oblong.
The 6x9cm format is almost the same proportions as 35mm being a good oblong without stretching into panoramic territory. I used the Fuji GSW69111 for a number of years and found it to be a camera that can be easily and quickly used for landscapes. My first years as a freelance photographer saw me producing a large number of pictures for postcard publishers. Many like this shot were simple and obvious compositions using a wide-angle lens and a polarising filter. The 6x9cm format just made them stand out when compared on a light box with 35mm shots.
Remember when working in panoramic that just because most are taken landscape that is no reason not to use them in upright mode. Doing so can really emphasise the foreground of a scene. Here it was the yellow lichen on the rocks that attracted me to the scene, and the 6x12cm format has enabled me to make the most of it.
Some areas of photography where medium-format cameras benefit can't strictly be defined as such but there are some instances, for example where landscapes or formal portraits where the medium-format camera has an advantage, though for a lot of action sports and wildlife photography it's 35mm that has the lead. In general the correct use of a medium-format camera requires just a little more time and consideration than a 35mm camera, and for some subjects that's an advantage. There will, however always be portrait photographers who always produce great intuitive pictures of people on 35mm cameras and wildlife photographers working with the medium-format, the rules can all be broken at some time or other!