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Traditional forms of industrial marketing include advertising in trade journals and magazines, renting booths at trade shows, using manufacturer?s representatives to sell products. The market for these traditional advertising mediums have been steadily dwindling as more industrial goods and services buyers go to the internet to find what they are l

Marketing is the larger process of successfully selling products or services to the consumer from start to finish. Marketing may begin as early as the research and development stage and involves market research, product development, pricing, sales strategies, distribution, advertising and public relations.

In this model, the digital signature software is delivered as a service (SaaS) and it works on all platforms with a standard internet connection. Many modern companies will prefer this model since it doesn't cost anything upfront to set up the infrastructure and maintenance. Licensing will be based on the number of users, who will be billed either

Generally photographers put UV filters on DSLRs for the larger purpose of protecting their lenses. Lenses can cost hundreds or thousands of dollars, whereas UV filters are generally less than $40, and sometimes less than $10. 

UV filters are practically useless (image-wise) on DSLRs since digital sensors are not nearly as sensitive to UV light as film. So don't spend $150 on a "premium UV filter" if you're shooting digital. Just grab a $20 one off amazon and use it as a lens protector. 

Some digital cameras can adjust for lens focal problems. Sometimes the focus was sharp enough but other times, especially at f/2.8 (limited depth of field) the shots were soft. This was a film camera and no local calibration was possible.