Despite their good points, transparencies do have disadvantages. Small and diƒcult to see, they generally require a projector and screen for proper viewing. e nal image is contained on the lm base itself, making each slide a unique object that must be handled with care to prevent damage when being viewed. While both of these characteristics can make slides less convenient to use than prints, their major disadvantages lie in their post-exposure limitations. Unlike negative lm, the range of contrast for transparencies can be manipulated only slightly through development, which directly aects the color balance of the lm. Worse yet, there is no second chance to make corrections with slides, as there is when making a print. Transparency lm has a much narrower exposure latitude than negative lm. An error of even 1/2 f-stop can ruin the picture since both the color and density of the completed picture are determined by exposure. Overexposed highlights become chalky white with no detail, while underexposed shadows are bulletproof black. Nor is slide lm as versatile as negative lm in mixed light situations. It is possible to make some corrections by recopying or scanning the slide, but this adds contrast and takes away the initial advantages of slide lm. Also, fast slide lm (ISO 400 and above) tends to be much grainier than equivalent-speed print lms.