ChrisKten
It's true, I quite like Pigeons
I'm sure someone with a Physics degree will correct the flaws in my theory below, and tell me I've got it all wrong, but...
I'm trying to decide what lens (reach) I need on my DSLR(T) to compare to the 600mm + 1.7 TC of my bridge camera. Obviously there's other factors, like pixels on the subject and sensor size, but I'm pretty sure I've sorted it out, but it's early and I don't trust my brain yet.
A full resolution (20.1mp) image from my camera is 5456*3632 - if I take a 50% crop 2728*1816 from this image, it's the equivalent of zooming in 2X the 450mm. So if the image was taken at 450mm, the 50% crop would be equivalent to 900mm reach (close to the 600*1.7 from the bridge camera, and with a larger sensor). Have I got this right? As it seems too easy.
(Many cameras use this cropping method to increase reach (decrease field of view), they call it different things, but the method is the same)
I'm trying to decide what lens (reach) I need on my DSLR(T) to compare to the 600mm + 1.7 TC of my bridge camera. Obviously there's other factors, like pixels on the subject and sensor size, but I'm pretty sure I've sorted it out, but it's early and I don't trust my brain yet.
A full resolution (20.1mp) image from my camera is 5456*3632 - if I take a 50% crop 2728*1816 from this image, it's the equivalent of zooming in 2X the 450mm. So if the image was taken at 450mm, the 50% crop would be equivalent to 900mm reach (close to the 600*1.7 from the bridge camera, and with a larger sensor). Have I got this right? As it seems too easy.
(Many cameras use this cropping method to increase reach (decrease field of view), they call it different things, but the method is the same)