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[eeyore]

Originally Posted by DaiTheDragon

Sorry Hobjob but you are giving the wrong impression in your post. If you put a 400mm lens on a FF, 1.3, 1.4, or 1.6 size sensor you get exactly the same picture at exactly the same distance except that if you had a bird in the center the FF would have more space around the bird than a 1.6 sensor. In other words using a 1.6 sensor would look like a cropped version of a FF sensor.

Dai

which is exactly the same result that you would get through having a longer le
ns as hobjob said (with the slight exception that a 500mm lens would give slightly less depth of field )

Nor is it exactly the same as a crop as the number of MP your sensor has comes into play - if the FF sensor has the same megapixelage as the 1:6 then cropping it to the same factor would leave you with a smaller file.

I know that technically it is a crop factor but the 35mm equivalent lens lengths are pretty widely accepted now , like it or not.