dimanche 21 novembre 2004

Bulk film load savings... Or another compelling argument for digital? If you're a traditional photographer using film rather than digital it doesn't take too long to work out with a pocket calculator that you can save a lot of money over a period of time by buying all or most of your film stock in 30.5m/100ft bulk rolls. The initial cost of the loader and a supply of reloadable film cassettes have to be taken into account... but their costs diminish with each bulk load used. The savings may appear marginal at first if you think your film usage is not that great... but when you consider that over a period of several years you can use a lot of film then the savings become more apparent. As an extreme example, but true nevertheless, I have exposed something over 10,000 films in the past thirty years. Of that total around 8,000 were monochrome leaving 2,000 colour transparency. At a rough guess 80% of all those films were loaded from bulk rolls - which provides some interesting cost breakdowns. As I cannot remember or guess the prices of films from the mid-60s onwards I've taken typical discount film prices from a decade ago as a guide. Of my 8,000 mono films approximately 6,500 were from bulk... therefore I bought 360 bulk rolls to load 18 x 36exp films per 100ft roll. At prices 10 years ago of say £33 for a 100ft roll of Fuji Neopan 400, that equates to a total cost of about £12,000. If I'd bought 6,500 factory loaded cassettes they would have cost me slightly over £21,000. So by adopting a bulk-loading policy early on in my photographic life I saved around £9,000. Sheesh... the more I go into this calculation the more compelling digital photography becomes! Maybe I'm rewriting the monthly death-knell for my own preference! My use of colour transparency emulsions show smaller savings. Of around 2,000 films used in that same period 1,500 have been from bulk loads and 500 bought off the shelf. The cost of say 1,500 rolls of Fuji Velvia from bulk today would be £6,000 (66 x 100ft rolls) whereas the factory loaded cassettes would have set me back £8,000... or an extra £2,000. Taking the cost savings further my current Computrol bulk film loader which is still in use after 20 years or so, and which cost around £15 in 1976, must have seen 6,000 rolls through it and has therefore cost me a minuscule one quarter of a penny per roll loaded. All these figures are meaningless, however, if you simply don't trust your own abilities to load film or have done so a couple of times and experienced scratched and ruined frames or entire films on each occasion, to say nothing of the photo opportunities lost forever. Cleanliness is next to Godliness The above in bold type is the one supreme rule for this technique. When you consider that a single, tiny speck of grit caught in the velvet or fabric light-trap of a standard film cassette can scour a line the entire length of the film as it's being loaded, another line as it's being advanced in the camera, a third line as the exposed film is being rewound into the cassette and, unfortunately, if you load a processing spiral directly from the cassette a fourth line as you do the latter... then it's understandable that the practice is shunned by many and unmentioned by those too embarrassed to retell their fate. I'm most familiar with the Computrol loader and have had no problems with it in two decades of use. Any scratching problems I've experienced have always been traced to the film cassette's fabric light trap rather than the gate in the loader. My original Computrol was made by Restem in Israel although the current model is made in the UK from the same basic mouldings. American photographers will be more used to the Watson loader which is very similar to operate. Both have a mechanism where by twisting the rim of the film chamber a gate opens to allow clear passage from bulk roll to film cassette. Although the Watson has a much wider clearance in the gate at 30mm, compared to 7mm in the Computrol the difference is of no practical advantage since a 1mm clearance is enough to prevent film scratching if the loader's design is correct. The Watson has a hinged cover to the film cassette chamber (which means you can't loose it in the dark) and is lifted by a cam which cannot be activated until the film gate is closed tightly across the film, thus removing any possibility of accidental fogging of a 100ft bulk roll. This loader also has a data panel for details of film speed and type, number of films loaded, date, etc... a feature none other has. Operation All bulk loaders should be practised with before using with "the real thing." An old length of 35mm film is all that's needed to perfect the only tricky operation... that of threading the film's leader through the gate or trap to the cassette chamber. It's worth doing this a few times in normal room lighting to see exactly how and where the leader has to go then repeating the process a few times with your eyes closed until confident enough. You'll also need a few other items... a supply of film cassettes, a roll of 1/2" wide masking tape, scissors, a dark-changing bag (if you're not using a darkroom), labels and a pair of lintless cotton gloves. You'll be surprised how panic can set in the first few times you load an expensive bulk roll of film... any hiccup in the procedure and your hands will sweat with fear! I've tried both plastic and metal cassettes and have to say that the metal ones feel safer. Plastic ones usually have a nib on the screw-cap which can easily be knocked, with the cap turning ajar, whereas metal ones have to be prised off with the thumb. The velvet or felt light-traps always have to be examined closely between loadings and carefully cleaned with a blower, or, a strip of low-tack masking tape can be slid through the gap to pick up any stubborn grit, hair or dust. In any event keep a note of how many times you use your cassettes and throw any away after about ten loadings. Better safe than sorry. Finally, there are many different emulsions available from all the major film manufacturers so your favourite emulsion should be available in a 30.5m/100ft bulk roll (other lengths as indicated) at an attractive saving to your overall photographic costs... have a look at your on-line dealer's lists. As for the sub-title of this blog... it does make a compelling argument stronger to realise that film costs are so great over a period of several years. And of course with digital you can shoot hundreds of images in a day, retain the "keepers" on your computer... and reuse the disk in your camera. Ah well... more problems to lose sleep over! 7:57:36 PM    comment []