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I was playing with my step dads 70-200L is ii and MK2 2x extender and this was the best of the bunch
crescent moon by Buzz_Lightweight, on Flickr
crescent moon by Buzz_Lightweight, on Flickr
if i get a decent tripod/gimbal, i'd like to try and stack a 2x/1.4x with my 400 to get a shot
Yes! I saw an awesome video where a guy shot this big yellow moon rising over a hill in Australia that was 2km away with a 650mm and 2x extender, and because of the crazy compression there was this giant ass moon with these people walking about in front of it.
found it!
http://vimeo.com/58385453
I'm not an expert but I would have used a larger aperture and a faster shutter speed.
They were using 2x extenders so wouldn't have to crop as heavily as you. Yours is a tad overexposed in parts though.