Ever wonder what people are talking about full frame sensors and digital crop sensors? Wonder why people will constantly say that a 85mm lens is actually a 135mm lens on a cropped sensor? It can be a firestorm of controversy. It boils down to the size of the sensor. And camera people always compare sensors to the size of 35mm film.
To save money and make technology cheaper the first digital sensors used in digital photography were smaller than 35mm film. Physics becomes the name of the game. The only advantage that digital gives the photographer is it appears that a lens is longer than it is. Otherwise you lose wide angle power, there is better low light performance on a larger sensor and more advantages to a full frame sensor.
The next two photos show the way the two kinds of sensor behave at 135mm. The first one is from my full frame camera the Canon 5D Mark II. The second photograph is the digital crop sensor from the Nikon D90. You can see that the full frame sensor almost feels like a bit of a wide angle.

Canon 5D Mark II at 135mm

Nikon D90 Cropped Sensor at 135mm
I had to zoom out to 82mm on my cropped D90 to achieve the same composition.

Nikon D90 at 82mm
A side question: do you like the color from the Canon 5D Mark II or the Nikon D90? Or are they too similar?
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Posted in Daily Photograph Project, Digital Photography, camera gear | Tags: canon, cropped sensor, focal length, full frame sensor, nikon