I've seen that article! I even took his test. I didn't notice the pincushion distortion until the most severe one IIRC. It was neat to try if you've got 2 minutes. http://www.holgermerlitz.de/globe/test_distortion.html
Thanks. I'm in Canada, so shipping and duty might be too much on these if I have to send them back. It makes me think twice about them. I've never tried any binos with field-flatteners, so I'm not sure how sensitive I'll be to it. That's what it comes from, right?
it! They are $4.25 and apparently they fit under the original eyepiece covers. https://agenaastro.com/agena-eye-guard-1-25-zoom-eyepieces-id-39-5mm.html
Ok, I see. It sounds like they would be good for me then. I think I saw a thread about someone putting extensions on the eye cups and it helped. I'll see if I can find a link.
How about the b1 binoculars? I've seen a deal on these used and am comparing them with the cronus, which are 399. Any opinions on how the older Mavens stack up?