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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. 

A beginner should invest in a quality drawing pencils, drawing surfaces, variety of erasers, a good pencil sharpener, quality drawing pens & pencils and a storage for your art and material.

Pay yourself a reasonable hourly wage, add the cost of materials and make that your asking price. For example, if materials cost $50, you take 20 hours to make the art, and you pay yourself $20 an hour to make it, then you price the art at $450 ($20 X 20 hours + $50 cost of mater

Reputation of the artist: Very much like all other items, art is valued in relation to other pieces of art. Recent auction prices influence the price of modern art. So for instance, if the work of an artist has fetched a huge amount, other works of that artist will also be perceived a

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. 

2B- Softer than the HB, 2B makes darker lines. 2B is great for outlining drawings. A) Clutch or Lead Holder pencils. They use 2mm graphite refills which are the same size as the wood cased pencils.