Heya,
So as promised, I applied 150-600mm onto a live subject, as I feel it gives a better sense of meaning when it comes to knowing what focal length you'll need for real world work. Most big telephotos are used for wildlife and things like that. Sure, someone uses it for something other than that. But most people interested in 600mm are either getting a telescope for DSO's, or are shooting wildlife and other things that are far away and not easy to get to.
For reference; this was shot on an APS-C sensor. I will always shoot 600mm on a crop.
I purposefully chose a large bird, about 80~100 feet away.
This bird is large enough that it does not fill the frame, at 600mm, even on an APS-C.
The point was to stress distance, and why it's critical to get more pixels on target and not just do heavy crops.
These images were quickly snapped to try and keep them very similar; not meant to be critical photographs. Consider them simply references of field of view to give an idea of what focal length for a distance might be needed for you.
I did the major focal length stop points on the lens. +/- a few mm, as I quickly zoomed and snapped.
These were done today at La Chua trail, Payne's Prairie.
These were shot in poor conditions, over water, on a super hot 90F day near noon.
These images are not cropped. RAW -> JPG, and text/marks.
IMAGE LINK: https://flic.kr/p/obQTSk
IMAGE LINK: https://flic.kr/p/nUngZa
IMAGE LINK: https://flic.kr/p/nUm59S
IMAGE LINK: https://flic.kr/p/nUm4Rh
IMAGE LINK: https://flic.kr/p/obLzx9
I still stand that 400mm is the beginning of reach when it comes to wildlife in the wild. But 600mm has a distinct reach advantage. 500mm and 600mm are pretty close. But 400mm is not 600mm.
Very best,









