Correcting distortion also affects composition, so some things that were in the frame can end up cropped-out of the frame as the distortion correction involves stretching parts of the image and the results get cropped to keep the frame rectangular.

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Vignetting is extremely annoying but, unless it is severe (1+ stops), can be correct quite easily without much detriment to image quality. You will get increased noise in the extreme corners but that is usually it. Of course, when it is above +1 stop, it can cause areas to be under-exposed while measurably withing the camera's dynamic-range. Personally, I find that 1/4 EV or less of vignetting is not noticeable on most subjects.

Although you say you can easily correct distortion in you computer, it's always best to get it right in the camera first time. You should only resort to the computer when it is impossible or impractical to do better at the time.

The reason distortion is better than general softness is that you at least have the option to not correct it and - of course - not make everything soft at the same time. There are plenty of subjects for which distortion is not easily noticeable.

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As the post above says, it depends on what you shoot. I do allot of architectural and travel photography: Except where I want to use a distortion for artistic effect, I dislike any pincushion or barrel effects. Five years ago when I mainly shot landscapes it could also be a problem when the horizon was off centre, it would curve up or down. However for nature and close up shots it should be less of an issue and you should look for the lens sharpness, fine detail or speed instead.

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Given that software can pretty trivially fix pincushion and barrel distortion patterns if you're shooting in RAW (Lightroom did the right thing just by knowing what lens I used with the given EXIF information), does it really matter if a lens has these types of distortion (so long as the are not so significant that the post processing does not lead to other significant artifacts of course)?

Chromatic aberrations are annoying but generally avoidable and affect only small parts of the image. Correcting them has a very localized effect.

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No, it's not all that bad. On most shots, you won't be able to tell by eye if the curvilinear distortions have been corrected for or not - you'll need straight lines adjacently parallel to each other or to edge to tell. In nature, you won't have those lines. In portraiture, it will exaggerate some parts and diminish others, but perspective distortion and lighting has much more effect on result.

Reasoning for asking this: I've found the distortion with the D7000's kit lens to be really bad -- but optically it's fine on pretty much every other front. Lightroom makes this go away, but I want to be aware of possible issues this might cause while I'm actually shooting...

A collimator is a simple tool that helps align the optical axes of the mirrors of a Newtonian reflector, a process called collimation. Offering the smallest ...

Dec 7, 2021 — The ribbed side of the fresnel always goes against the ground glass. A fresnel is a lens and as such the ground glass has to be moved back the ...

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The reason you've heard so much about them is that you've read many lens reviews, and distortion is rather easy to measure and write about.

That is why when Nikon introduced their 18-200mm lens, instead of making it extremely soft like all others of the same focal-range, they made it sharper but left in a lot more severe distortion.