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Message: <blockquote data-quote="Tobias Mennle" data-source="post: 3666641" data-attributes="member: 117315">Henry, thanks a lot, more food for thought.About moustache distortion, you´re of course right and I took similar notes when testing the 8x32 SV, it has pincushion in the center changing to, well, at least less pincushion towards the edge (whereas normally - so on Wikipedia - mustache distortion is defined as barrel in the center, pincushion at the edge.).About veiling glare in the Noctivid, sorry I don´t have photos as I was using the little periods of sunshine to observe... but it´s really remarkable that annoying crescent flares were non existent. I will check when I get the 8x42.So AMD basically means barrel distortion. Still I am wondering if field curvature does give images extra 3dimensionality beyond pure stereopsis or sort of overlays the distortion pattern somehow. In classic pincushion designs like FL or Ultravid the image center sometimes seems to slightly bulge out a bit towards the viewer (like in barrel distortion) and when I put three wineglasses in a row and view them with one of these glasses they seem to get smaller towards the field edge. And what role does astigmatism play in that.</blockquote>