Find out what this is for your lenses and try to use those settings wherever possible. Wide-angle lenses are particularly prone to curvature at the edges of the image. Flat field wide-angle lenses, perspective control lenses and specialist cameras are available but are generally more expensive than 'standard' equipment. Two types are in general use, electronic flash and tungsten filament lamps. The main disadvantage of electronic flash is that the more powerful studio units are expensive.
Tungsten lighting is less popular than electronic flash but some photographers prefer it.
Its main advantage is that it is cheaper than professional flash units. Disadvantages are that it generates a lot of heat which can be damaging to subject matter and can make for an uncomfortable working environment. As tungsten filaments age they give a different quality of light and compensations must be made, by the use of coloured filters, so that correct colour is captured on film. Internal non-studio lighting Where studio lighting is not available the photographer is afforded less control. Quality and control can be affected by size, position and adjustment of windows and room lighting.