I’m struggling to decide whether to spend the money I earned from a little seasonal job (No I wasn’t Father Christmas!!) on a 6D or a 70D and some more glass.
As part of this process I’ve been trying to understand the true difference between cropped & full frame images.
My thinking to date is a follows.
Let’s say I want to take a shot of a car with the 70D and my trusty 24-105 f4 L lens. I stand at a distance from the car such that the image of the car exactly fills the viewfinder at 24mm & I take the shot. (Can we ignore for the purposes of this line of reasoning the quoted 98% viewfinder coverage). The image of the car should completely fill the sensor (all 20.2mp), but the outer edges of the image projected by the lens falling outside the sensor area will be “lost”.
If I swap the lens to the 6D and stand in exactly the same location and again shoot at 24mm the car will neither fill the viewfinder nor the sensor. The outer edges of the image “lost” in the previous example will be recorded. In other words the physical size of the car in the image on either sensor will be identical, but the one on the 70d will be recorded on more pixels.
However because of larger physical size of the 6D sensor (with the same number of pixels as the 70D), each pixel is larger, and can therefore capture more light giving better high ISO performance. In addition in the above example I could zoom in to 38mm and therefore fill the frame on the 6D in the same way as I had on the 70D and the image of the car will be recorded on exactly the same number of pixels as the shot at 24mm on the 70D.
Have I got this correct??? I'd appreciate your expert feedback.
As part of this process I’ve been trying to understand the true difference between cropped & full frame images.
My thinking to date is a follows.
Let’s say I want to take a shot of a car with the 70D and my trusty 24-105 f4 L lens. I stand at a distance from the car such that the image of the car exactly fills the viewfinder at 24mm & I take the shot. (Can we ignore for the purposes of this line of reasoning the quoted 98% viewfinder coverage). The image of the car should completely fill the sensor (all 20.2mp), but the outer edges of the image projected by the lens falling outside the sensor area will be “lost”.
If I swap the lens to the 6D and stand in exactly the same location and again shoot at 24mm the car will neither fill the viewfinder nor the sensor. The outer edges of the image “lost” in the previous example will be recorded. In other words the physical size of the car in the image on either sensor will be identical, but the one on the 70d will be recorded on more pixels.
However because of larger physical size of the 6D sensor (with the same number of pixels as the 70D), each pixel is larger, and can therefore capture more light giving better high ISO performance. In addition in the above example I could zoom in to 38mm and therefore fill the frame on the 6D in the same way as I had on the 70D and the image of the car will be recorded on exactly the same number of pixels as the shot at 24mm on the 70D.
Have I got this correct??? I'd appreciate your expert feedback.
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