i have a 3.5x10x50mm Zeiss Conquest,and it is an exellent low light scope and crisp and clear and no glare from the sun,i have had some nikon products and they are good but there C/S is not good,if something goes wrong with your scope or bino's,good luck.if you want a good low light scope no matter what brand get a 50mm,leave the 40mm's alone.
you will be able to see 15min. earlier and 15 min.later with a 50mm VS. 40mm.

Ted