I need to shoot for a billboard advertisement. The billboard size will be around 20-15 foot.
Do you think a consumer level DSLR [550D, D5100, D90] is good enough for this or need to switch to pro level DSLR [5D, D3s] ?
Ans also what megapixel will be good enough for that size ?
Edit
Billboard size approx 20[w]-15[h] foot
Minimum distance from Viewer will be around 35 ft from the bottom point of the billboard.
The billboard image will be colorful.
Answer
While we often ask what resolution is needed for a certain print size, it no longer holds for things which are so large. What is key is resolution per angular extent, meaning how big do you expect people to see the billboard. That largely depends on how close viewers can get to it.
A 20 foot billboard seen from 20 feet away looks pretty much the same as a 5 foot one seen from 5 feet away, so it needs the same resolution. If you do need to produce a billboard that will stand real close inspection, then even a medium-format camera will not cut it and you will have to resolve to stitching images. Any camera with manual controls can do that, you basically need a very long lens and take each section at a time with some overlap.
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