I should say right from the start, that as far as binoculars go - I'm a complete newbie. So these brief thoughts are just my first impressions of using these particular bino's and I guess, bino's in general. I don't have experience with any others for comparison other than some briefly used, horrible quality ones.
In fact, I've probably done things the wrong way around! That is, I started with a telescope and only now, years later acquired this pair of binoculars.
Why 7x50 instead of the 10x50 version of the Aculon? After scouring through all possible threads here (thank you!) it seemed that despite the narrower FOV (TFOV=6.4*, AFOV=42.7*) these binoculars are quite good (in my view) because they are sharp/flat, edge to edge. Furthermore, their main purpose for me, was to help get a different perspective on the night sky and perhaps also look at those things that can't be viewed as a whole when using my Dob. The plan was not to eek every detail out of DSOs. I felt that higher magnification was unnecessary as that is what my telescope is for. Additionally, using only 7x magnification allows me to hold the bino's (more) steady. In the future, well, who knows, I might end up with a collection of these things.
While I can't confirm that my pupils dilate to 7mm (I'm 60), I do see quite well in the dark and feel that the exit pupil of these bin's is likely not to be too large for me. Not scientific judgement, I know, but I'm running with it . There is also the notion that with the larger exit pupil, the bino's may be more comfortable to use during the day.
Once home after getting the Aculons, I tried them outside in the middle of the day. I don't need glasses for telescopes or binoculars, nor do I have any astigmatism (just need reading glasses.) I wound the eyecups up, adjusted the central focus for the left eye, then the right side focus for the right eye, and I was good to go. No problems with poor collimation or other undesired phenomena such as low ER (reportedly, 17.6mm.) The eyecups seemed to work well for me. Just had to play with the inter-ocular distance a little, but soon enough the two images (left and right) merged into one.
I wasn't expecting these to be so sharp and bright! But looking at various plants, trees, leaves, etc., I was amazed at the picture they presented. I kept looking for distortions or aberrations, especially around the edges, but nothing jumped out at me. Colours seemed natural. The specified closest focusing distance of 8m appeared about right. And yes, at 904g, they can start to get a little heavy when holding them up for an extended period. Having said that, I was able to keep them quite stable, though with practice, I'd hope this will improve further. The main thing causing them to periodically vibrate was my heart. Each thump caused a tremor in the image - but then, I run a lot so have a powerful, slow pulse. Now, if I can just find some way to turn that off ... In any case, I'm quite delighted with these for daytime use.
Waiting outside looking threateningly at the sun didn't make it go down any faster. When it was dark (finally), the stars through the bino's were pinpoint and bright, despite the moon being in the middle of the sky, three-quarter lit. I couldn't detect any coma at the edges. The moon was nothing like as large as what one sees using a telescope, but to make up for it, was very crisp and detailed, indeed! Leaning against a post helped, but I felt a tripod would have given the best view possible, because even the slightest tremor takes away from the detail that can be seen. When held very steady though, or when supporting the bino's on a tree fork, there was lots of interesting minutiae available to the eyes. I was looking for signs of chromatic aberration, which I believe can happen when pointing bino's at a bright moon. There was maybe the teensiest sign of purple fringe at the edge of the moon, but had I not been looking for it, I would never have noticed. Perhaps I imagined it
There weren't a lot of details visible for Jupiter and Saturn, what with no tripod and the moon out. However, I did at least spot one of Jupiter's moons, despite the conditions.
I was surprised that even with all the moonlight, I could actually see the nebula component of M42. Not like with a telescope using 200x magnification, but nevertheless quite apparent.
I'm looking forward to trying the Aculons without the moon present. Tonight was just to get a feel of what they are like to use. So far I'm very happy with them.
I should add that I noticed no flexing of the bridge, nor a stiff focusing mechanism that I believe others may have reported for some of the bino's in the Aculon line, like the 10x50 ones.
If in due course I look through some $1K bino's maybe I'll be amazed, but perhaps I'd rather not know what I'm missing as the 7x50 Nikon Aculons have me feeling pretty satisfied at the moment. In a few weeks I'll have a lot more experience with them and can then check back with myself whether or not I'm feeling jaded with them
Thanks for reading!