Title says it all basically, cheers

No it isn't. In vanilla, no way to unotch an arrow but if you are on PC, theres bound to be a mod for it on http://www.tesnexus.com/.

You can't zoom in without docking an arrow first on your bow.

Yeah I'm on 360, just wanted to kno as my bow doesn't have many charges , trying to maximise them, I just have a habit of zooming in before shooting . Thanks anyway

http://www.tesnexus.com/downloads/file.php?id=21104 has a denock option, and many other features.

It is entirely possible to denock an arrow, even while zoomed in the vanilla game.

Quoting UESP wiki:
'There are three ways you can remove a nocked arrow from a drawn bow, preserving the enchantment charge or poison on the weapon.
-First, you can initiate a conversation with an NPC: exiting from the conversation will return your bow to a resting state (be sure to release the attack button before exiting the conversation, or you'll nock the arrow again). The limitation of this technique is that you must first find an NPC who is willing to talk.
-Secondly, a Journeyman of Acrobatics can disarm their bow by using the Dodge feature. There is the sound of an arrow being shot off, but a look at your ammunition and/or enchantment charges should show that no shot was actually taken.
-Thirdly, when you are staggered or knocked down by a hit while an arrow is nocked. Generally, this will happen in a situation where you may have preferred shooting the arrow off rather than keeping it.'

I frequently nock an arrow, zoom in to scope a target, then perform the dodge manuever (Acrobatics +50 perk) by simultaneously block/zoom, moving and jumping. It was a little awkward at first, but now seems second nature and comes easily.

If you have neither poison nor enchanted arrow nor bow charge on the line, it is simpler to simply shoot into the ground and grab the arrow.

There are several mods that also provide for a simple denocking ability for PC users. I realize Dave C is on 360.

:foodndrink: