Mabou2 Posted at 2017-9-12 15:42
Hey Gt3rs,
Well... I shoot with my full frame DSLR and my 400mm lens regularly (me, a professional photographer for 35+ years)... No way in heck that a 63 foot item, shot from close to 1000 feet is going to fill the frame (I hate to break it to you, but that image is cropped, or was shot on a small sensor camera with a 1.6 crop factor?, or some part of the information is incorrect). A 400mm lens isn't a telescope. Actually, it is a bit frustrating how it DOESN'T get close enough to the action.... even when I am shooting football.
Everyone here is telling you that is really hard to believe that they were so low. Why would they go so low? I did explain to you how you can calculate and not pure guessing the distance, but instead you come up with story that a 400mm is not a telescope, I was using a 1.6 camera, it is cropped, etc... Why you didn’t simply use the calculator with your image and data and post the result here? Anyway here is the download to my image with exif intact: You will see that is taken with a 1Dx II with a 200-400 with 1.4x engaged at 490mm. The FA 18 takes 4695 pixel in width in the image.
If the F15 was at 400 feet you will have the plane filling the whole frame on a FF DSLR at 228mm, you with a FF at 400mm and the plane being so small in the picture ....
If they were at 400 feet with your 400mm it would be something like this (this is actually how it would be at 522 feet):
So please do the calculation with your image and tell the people that those F15 were way above 400 feet so no issue at all for the drone.
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