Doug,
Wow, mate. As beautiful as the crops are, I adore the full frame that you've presented here. The hydrogen alpha processing definitely gives a sense of scale. Very, very smooth processing, too. Glad to see you've toned the sharpening down a touch.
The only thing I would suggest is if the main attraction was more centred. Other than that, magic. I will have to give this a go with the FSQ and Extender-Q 1.6x.
Cheers!
H