Small mix of seabirds

Awesome shots. The first one is definitely not common around here.
Thanks,

Ignore the common part, that was a miss-type :D
 
[...On a crop body 600 is effectively 900, which is crazy close and allows you to be further from the subject.
Ehhh... this is a common misconception. With respect to to the focal length or "crop" factor issue, on a 1.5 crop-frame camera, while a 600mm lens will give a field-of-view equivalent to that of a 900mm lens, there is no extra magnification. All that happens is the field of view is reduced and because of the crop factor an illusion is created which makes it appear as though you are closer, but if you do a comparison of subject size, assuming all factors are constant, between a full-frame and a crop frame camera, the subject will be the same size in both.
While you are correct, I think something commonly overlooked with this is that by using a crop camera, you do typically get much higher pixel density covering that same subject over full frame, so as long as the lens I sharp enough to resolve it, crop frame cameras support cropping in further due to the pixel density.
 

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