You got an excellent field glass, sure you won't regret, as Vaughn points that (usually) smaller aperture from field glasses may make harder to focus in low light conditions. This has to be addressed with a well light-tight dark cloth, in special if we are under sunlight but the subject is in the shadow. To focus at infinite we can use bright spots in the scene, even the moon itself it's quite useful to focus at infinite for night photography. With low light, for a near subject I place the smartphone on it with the screen on, also we can leave a flashlight on the ground illuminating it while focusing...
I use old convertible symmars that (when converted) should be focussed at the taking aperture (because focus shift), but with those tricks I get perfect focus even when focusing at f/32.
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