i am a binocular fan but you can't use them for looking at planets, the C5 is more versatile esp for astro
do you have a good photo tripod? or how are you going to mount the C5?
the plus side of the bino is they give you a right way up img of the ocean, on the C5 you need an erecting prism to do this for you
you might consider a spotting scope like the celestron regal 100ED, (though look to the US , way cheaper than local)
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