I know the title of this thread sounds like a 1950s B horror film produced by Goya. But I have some questions about killer kidney beans.
Using my expanse clones (6mm/9mm) during the daytime in my refractor can produce some annoying kidney beaning, and I never tested my dob during the day (little point to it)... but last night I tried them out on the moon. And kidney beans attacked my eyeballs.
My question is, is this a specific issue with these eyepieces or do most wider fov eyepieces have this same issue with the moon? I assume the moon may be an issue since the edges of the view are illuminated by the size of the moon, while smaller targets are just the blackness of space... so the latter is less obvious or annoying.
Now if I get my eye situated just right, it's not a big deal. 6mm seemed worse than the 9mm, as it also added a little extra glare to the bean, so it became glowing kidney beans. 9mm still had issues too though. I didn't really notice any major beaning with the expanse clone at 15mm. And it is probably just a coincidence, but using a half-barlowed 15mm (so equivalent to 10mm) produced less beaning than the 9mm did ... but I didn't spend a lot of time testing that out. 10mm plossl had no beaning, but that is a narrower fov.
Basically curious if it's specific to my eyepieces or does this also occur with other wider fov eyepieces, specifically on the moon? I thought my f/8 scope would be immune to this, but it doesn't seem that way. Do zoom people get this?